fix: top/bottom edge resize broken — menubar ate events + minimumSize clamped to 1121px

Two independent root causes for '左右能拉，上下不能拉':

1. Event delivery: the top 6px edge band belongs to QMenuBar, which
   actively consumes mouse events (menu hover) — nothing ever propagated
   to QMainWindow, so T/TL/TR (and maximize-restore from top edge) were
   dead on every platform. Install an event filter on menuBar()/statusBar():
   within the edge band it handles hover cursor, press (grabMouse), drag
   and release; outside the band everything passes through (menus open
   normally, native QSizeGrip corner drag preserved).

2. Layout minimum: MonitorPanel's minimumSizeHint (~1015px of stacked
   tables/group boxes) propagated through QTabWidget → central widget →
   QMainWindow, making the window minimum size 898x1121. Any vertical
   shrink was clamped dead. Set explicit per-tab-page minimumSize
   (320x200) + window minimumSize (760x480).

Tests: test_resize.py now drives edges through real event delivery
(childAt → child widget, propagation/filter path) for L/R/T/B/TL/TR/BL,
verifies BR stays on QSizeGrip, maximize-restore via menubar filter,
and minimum-size regression. All 8 suites pass.

build.spec

@@ -31,8 +31,8 @@ a = Analysis(
     pathex=[str(ROOT)],
     binaries=[],
     datas=[
-        # 如果后续要加资源文件（图标、配置模板），放这里
-        # ('resources/icon.ico', 'resources'),
+        ('resources/icon.png', 'resources'),
+        ('resources/icon.ico', 'resources'),
     ],
     hiddenimports=hiddenimports,
     hookspath=[],
@@ -80,5 +80,5 @@ exe = EXE(
     target_arch=None,
     codesign_identity=None,
     entitlements_file=None,
-    # icon='resources/icon.ico' if Path('resources/icon.ico').exists() else None,
+    icon='resources/icon.ico' if Path('resources/icon.ico').exists() else None,
 )

core/manager.py

@@ -17,12 +17,13 @@ AI_CONFIG_FILE = CONFIG_DIR / "ai.json"
 
 
 class ConnectionManager:
-    """多主机连接管理 + 配置持久化"""
+    """多主机连接管理 + 配置持久化 + 分组"""
 
     def __init__(self):
         CONFIG_DIR.mkdir(parents=True, exist_ok=True)
         self._lock = threading.RLock()
         self.hosts: List[dict] = []  # 主机配置
+        self.groups: List[str] = []  # 分组名称列表（保持顺序）
         self.connections: Dict[str, SSHConnection] = {}  # host_id -> SSHConnection
         self._load_hosts()
 
@@ -30,23 +31,91 @@ class ConnectionManager:
         if CONFIG_FILE.exists():
             try:
                 with open(CONFIG_FILE, "r", encoding="utf-8") as f:
-                    self.hosts = json.load(f)
+                    data = json.load(f)
+                if isinstance(data, list):
+                    # 旧格式：flat list，自动迁移
+                    self.hosts = data
+                    self.groups = []
+                elif isinstance(data, dict):
+                    self.hosts = data.get("hosts", [])
+                    self.groups = data.get("groups", [])
             except Exception:
                 self.hosts = []
+                self.groups = []
         if not self.hosts:
-            # 给一个示例条目，让 UI 不为空
             self.hosts = [{
                 "id": "demo", "name": "示例主机", "host": "127.0.0.1",
                 "port": 22, "username": "root", "password": "", "key_path": "",
+                "group": "",
             }]
+        # 给所有旧主机补 group 字段
+        for h in self.hosts:
+            if "group" not in h:
+                h["group"] = ""
 
     def save_hosts(self):
+        data = {"groups": self.groups, "hosts": self.hosts}
         with open(CONFIG_FILE, "w", encoding="utf-8") as f:
-            json.dump(self.hosts, f, ensure_ascii=False, indent=2)
+            json.dump(data, f, ensure_ascii=False, indent=2)
 
     def list_hosts(self) -> List[dict]:
         return list(self.hosts)
 
+    def list_groups(self) -> List[str]:
+        """返回分组名列表（不含「未分组」）"""
+        return list(self.groups)
+
+    def add_group(self, name: str) -> bool:
+        """新建分组；返回是否成功"""
+        name = name.strip()
+        if not name or name in self.groups:
+            return False
+        self.groups.append(name)
+        self.save_hosts()
+        return True
+
+    def remove_group(self, name: str):
+        """删除分组；组内主机移到未分组"""
+        if name in self.groups:
+            self.groups.remove(name)
+        for h in self.hosts:
+            if h.get("group") == name:
+                h["group"] = ""
+        self.save_hosts()
+
+    def rename_group(self, old_name: str, new_name: str) -> bool:
+        if old_name not in self.groups:
+            return False
+        new_name = new_name.strip()
+        if not new_name or new_name in self.groups:
+            return False
+        idx = self.groups.index(old_name)
+        self.groups[idx] = new_name
+        for h in self.hosts:
+            if h.get("group") == old_name:
+                h["group"] = new_name
+        self.save_hosts()
+        return True
+
+    def move_host_to_group(self, host_id: str, group_name: str):
+        """移动主机到指定分组"""
+        for h in self.hosts:
+            if h.get("id") == host_id:
+                h["group"] = group_name
+                self.save_hosts()
+                return
+
+    def list_hosts_by_group(self) -> dict:
+        """返回 {group_name: [hosts]}，"" 为未分组"""
+        result = {g: [] for g in self.groups}
+        result[""] = []  # 未分组
+        for h in self.hosts:
+            g = h.get("group", "")
+            if g not in result:
+                result[g] = []
+            result[g].append(dict(h))
+        return result
+
     def get_host(self, host_id: str) -> Optional[dict]:
         for h in self.hosts:
             if h.get("id") == host_id:

main.py

@@ -20,11 +20,35 @@ _setup_path()
 
 from PyQt5.QtWidgets import QApplication
 from PyQt5.QtCore import Qt
-from PyQt5.QtGui import QFont
+from PyQt5.QtGui import QFont, QIcon, QPixmap
 
 from ui.main_window import MainWindow, APP_NAME
 
 
+def _get_icon_path() -> str:
+    """找到 icon.ico / icon.png 的路径"""
+    # 搜索目录列表：源码运行 / PyInstaller onefile / PyInstaller onedir
+    search_dirs = []
+    if getattr(sys, "frozen", False):
+        # PyInstaller onefile: 资源解压到 _MEIPASS
+        meipass = getattr(sys, "_MEIPASS", None)
+        if meipass:
+            search_dirs.append(Path(meipass))
+            search_dirs.append(Path(meipass) / "resources")
+        # exe 同目录（onedir 模式或用户手动放）
+        search_dirs.append(Path(sys.executable).parent)
+        search_dirs.append(Path(sys.executable).parent / "resources")
+    else:
+        search_dirs.append(Path(__file__).parent)
+        search_dirs.append(Path(__file__).parent / "resources")
+    for d in search_dirs:
+        for name in ("icon.png", "icon.ico"):
+            p = d / name
+            if p.exists():
+                return str(p)
+    return ""
+
+
 def main():
     # Windows 上高 DPI 适配
     if hasattr(Qt, "AA_EnableHighDpiScaling"):
@@ -39,7 +63,14 @@ def main():
     f = QFont("Consolas", 10)
     app.setFont(f)
 
+    # 设置应用图标（任务栏 + 窗口标题栏）
+    icon_path = _get_icon_path()
+    if icon_path:
+        app.setWindowIcon(QIcon(icon_path))
+
     w = MainWindow()
+    if icon_path:
+        w.setWindowIcon(QIcon(icon_path))
     w.show()
     sys.exit(app.exec_())
 

scripts/gen_icon.py

@@ -0,0 +1,130 @@
+"""
+生成 SSHClient 应用图标
+- 深色圆角方块背景
+- 终端窗口 + >_ 提示符 + SSH 连接线
+输出: resources/icon.ico (多尺寸) + resources/icon.png (256x256)
+"""
+import os
+from PIL import Image, ImageDraw, ImageFont
+
+OUT_DIR = os.path.join(os.path.dirname(__file__), "resources")
+os.makedirs(OUT_DIR, exist_ok=True)
+
+SIZE = 256
+
+def draw_icon(size: int) -> Image.Image:
+    """绘制指定尺寸的图标"""
+    img = Image.new("RGBA", (size, size), (0, 0, 0, 0))
+    d = ImageDraw.Draw(img)
+
+    pad = int(size * 0.06)
+    rect = [pad, pad, size - pad, size - pad]
+    radius = int(size * 0.18)
+
+    # 背景渐变（模拟，用两层半透明）
+    d.rounded_rectangle(rect, radius=radius, fill=(30, 30, 46, 255))
+
+    # 上半部分亮色渐变
+    inner = [pad + 4, pad + 4, size - pad - 4, size // 2]
+    d.rounded_rectangle(inner, radius=radius - 2, fill=(40, 40, 60, 255))
+
+    # 终端窗口
+    tw_margin = int(size * 0.16)
+    tw_top = int(size * 0.20)
+    tw_bottom = int(size * 0.78)
+    tw_left = tw_margin
+    tw_right = size - tw_margin
+    tw_radius = int(size * 0.04)
+
+    # 终端窗口阴影
+    shadow_offset = max(2, size // 64)
+    d.rounded_rectangle(
+        [tw_left + shadow_offset, tw_top + shadow_offset,
+         tw_right + shadow_offset, tw_bottom + shadow_offset],
+        radius=tw_radius, fill=(0, 0, 0, 60)
+    )
+
+    # 终端窗口背景
+    d.rounded_rectangle(
+        [tw_left, tw_top, tw_right, tw_bottom],
+        radius=tw_radius, fill=(12, 12, 20, 255)
+    )
+
+    # 终端标题栏
+    tb_height = int(size * 0.055)
+    d.rounded_rectangle(
+        [tw_left, tw_top, tw_right, tw_top + tb_height],
+        radius=tw_radius, fill=(50, 50, 70, 255)
+    )
+    # 底部直角覆盖（标题栏只有上面圆角）
+    d.rectangle(
+        [tw_left, tw_top + tb_height - tw_radius, tw_right, tw_top + tb_height],
+        fill=(50, 50, 70, 255)
+    )
+
+    # 三个小圆点（macOS 风格窗口按钮）
+    dot_r = max(2, int(size * 0.016))
+    dot_y = tw_top + tb_height // 2
+    dot_start = tw_left + int(size * 0.04)
+    dot_gap = int(size * 0.045)
+    for i, color in enumerate([(239, 83, 80), (255, 167, 38), (102, 187, 106)]):
+        cx = dot_start + i * dot_gap
+        d.ellipse([cx - dot_r, dot_y - dot_r, cx + dot_r, dot_y + dot_r], fill=color)
+
+    # >_ 提示符
+    cx = tw_left + int(size * 0.06)
+    cy = tw_top + tb_height + int(size * 0.10)
+    line_w = max(2, int(size * 0.022))
+    arrow_len = int(size * 0.08)
+    gap = int(size * 0.02)
+
+    # > 符号
+    d.line([cx, cy, cx + arrow_len, cy + arrow_len // 2],
+           fill=(102, 187, 106), width=line_w)
+    d.line([cx, cy + arrow_len, cx + arrow_len, cy + arrow_len // 2],
+           fill=(102, 187, 106), width=line_w)
+
+    # _ 光标
+    cursor_x = cx + arrow_len + gap
+    cursor_w = int(size * 0.06)
+    cursor_h = max(2, int(size * 0.018))
+    d.rounded_rectangle(
+        [cursor_x, cy + arrow_len // 2 - cursor_h // 2,
+         cursor_x + cursor_w, cy + arrow_len // 2 + cursor_h // 2],
+        radius=max(1, cursor_h // 3), fill=(137, 180, 250)
+    )
+
+    # SSH 连接线（底部装饰）
+    line_y = tw_bottom + int(size * 0.05)
+    if line_y < size - pad:
+        # 连接节点
+        node_r = max(2, int(size * 0.012))
+        n1 = (tw_left + int(size * 0.04), line_y)
+        n2 = (tw_right - int(size * 0.04), line_y)
+        d.ellipse([n1[0]-node_r, n1[1]-node_r, n1[0]+node_r, n1[1]+node_r],
+                  fill=(137, 180, 250))
+        d.ellipse([n2[0]-node_r, n2[1]-node_r, n2[0]+node_r, n2[1]+node_r],
+                  fill=(137, 180, 250))
+        d.line([n1[0]+node_r, n1[1], n2[0]-node_r, n2[1]],
+               fill=(137, 180, 250, 160), width=max(1, line_w // 2))
+
+    return img
+
+
+def main():
+    # 生成 256x256 主图
+    icon = draw_icon(SIZE)
+    png_path = os.path.join(OUT_DIR, "icon.png")
+    icon.save(png_path)
+    print(f"Saved {png_path} ({SIZE}x{SIZE})")
+
+    # 生成多尺寸 ICO（Pillow 自动从 256x256 缩放到各尺寸）
+    sizes = [(16, 16), (24, 24), (32, 32), (48, 48), (64, 64), (128, 128), (256, 256)]
+    ico_path = os.path.join(OUT_DIR, "icon.ico")
+    icon.save(ico_path, format="ICO", sizes=sizes)
+    print(f"Saved {ico_path} (sizes: {[s[0] for s in sizes]})")
+    print("Done!")
+
+
+if __name__ == "__main__":
+    main()

test_resize.py

@@ -0,0 +1,255 @@
+"""
+窗口边缘拖动测试：
+- _hit_test_edge 返回正确的边
+- mouseMove + mousePress 模拟拖动（直接投递到 QMainWindow）
+- 普通模式 + 最大化模式都覆盖
+- 真实事件投递（childAt → 子控件，依赖传播/事件过滤器）：4 边 + 3 角
+- 最大化时真实按压菜单栏顶缘 → 还原
+- 最小尺寸合理性（回归：MinimumSizeHint 曾把窗口最小高度撑到 1121px，上下无法缩小）
+"""
+import os
+import sys
+
+os.environ["QT_QPA_PLATFORM"] = "offscreen"
+sys.path.insert(0, os.path.dirname(__file__))
+
+from PyQt5.QtCore import Qt, QPoint, QEvent
+from PyQt5.QtGui import QMouseEvent
+from PyQt5.QtWidgets import QApplication, QSizeGrip
+
+from ui.main_window import MainWindow
+
+
+def make_mouse_event(type_, pos, button=Qt.LeftButton):
+    """构造鼠标事件（globalPos 同步）"""
+    glb = QPoint(pos.x(), pos.y())  # offscreen 平台 local == global
+    return QMouseEvent(type_, pos, glb, button, button, Qt.NoModifier)
+
+
+def deliver(target, type_, local_pos, button=Qt.LeftButton, buttons=Qt.NoButton):
+    """把事件投给 target（模拟 Qt 投给光标下子控件的真实路径）"""
+    ev = QMouseEvent(type_, local_pos, QPoint(local_pos.x(), local_pos.y()),
+                     button, buttons, Qt.NoModifier)
+    QApplication.sendEvent(target, ev)
+    return ev
+
+
+def try_real_drag(w, press_pos, delta, expected_edge):
+    """真实投递：press 到 childAt 命中的控件 → move → release。
+    返回 (命中控件, geo_before, geo_after)"""
+    child = w.childAt(press_pos)
+    target = child if child else w
+    local = target.mapFrom(w, press_pos) if child else press_pos
+    geo0 = w.geometry()
+    deliver(target, QEvent.MouseButtonPress, local,
+            button=Qt.LeftButton, buttons=Qt.LeftButton)
+    assert w._resize_edge == expected_edge, \
+        f"{expected_edge}: press 后 _resize_edge={w._resize_edge!r}（命中 {type(target).__name__}）"
+    moved = QPoint(local.x() + delta[0], local.y() + delta[1])
+    deliver(target, QEvent.MouseMove, moved, button=Qt.NoButton, buttons=Qt.LeftButton)
+    deliver(target, QEvent.MouseMove, moved, button=Qt.NoButton, buttons=Qt.LeftButton)
+    geo1 = w.geometry()
+    deliver(target, QEvent.MouseButtonRelease, moved,
+            button=Qt.LeftButton, buttons=Qt.NoButton)
+    assert w._resize_edge == "", "release 后 _resize_edge 未清空"
+    return type(target).__name__, geo0, geo1
+
+
+def main():
+    app = QApplication(sys.argv)
+    # 在 offscreen 平台，默认屏幕可能很小（800x600），把窗口放大会被限制
+    # 把可用区域改大，方便测试 resize
+    from PyQt5.QtCore import QRect
+    from PyQt5.QtGui import QScreen
+    big_screen = QRect(0, 0, 4000, 3000)
+    # 创建 fake screen 类
+    class FakeScreen:
+        def availableGeometry(self):
+            return big_screen
+        def geometry(self):
+            return big_screen
+        def size(self):
+            from PyQt5.QtCore import QSize
+            return QSize(4000, 3000)
+    # 替换 QApplication.primaryScreen 返回值
+    orig_primary = QApplication.primaryScreen
+    QApplication.primaryScreen = staticmethod(lambda: FakeScreen())
+
+    print("[1/8] 创建 MainWindow + 边缘 hit-test")
+    w = MainWindow()
+    w.resize(800, 600)
+    w.show()
+    # 中心 → 没有任何边
+    assert w._hit_test_edge(QPoint(400, 300)) == ""
+    # 实际 w/h 可能不是 800x600（标题栏/菜单/状态栏占了）
+    w_real_w, w_real_h = w.width(), w.height()
+    print(f"  实际窗口尺寸: {w_real_w}x{w_real_h}")
+    # 左边缘
+    assert w._hit_test_edge(QPoint(2, 300)) == "L"
+    # 右边缘
+    assert w._hit_test_edge(QPoint(w_real_w - 2, 300)) == "R"
+    # 上边缘
+    assert w._hit_test_edge(QPoint(400, 2)) == "T"
+    # 下边缘
+    assert w._hit_test_edge(QPoint(400, w_real_h - 2)) == "B"
+    # 左上角
+    assert w._hit_test_edge(QPoint(2, 2)) == "TL"
+    # 右下角
+    assert w._hit_test_edge(QPoint(w_real_w - 2, w_real_h - 2)) == "BR"
+    print("  ✓ 8 个区域（4 边 + 4 角）全部正确命中")
+
+    print("[2/8] 普通模式：拖右边缘放大窗口")
+    w.resize(800, 600)
+    w.show()
+    rw, rh = w.width(), w.height()
+    geo0 = w.geometry()
+    # 按下右边缘
+    press = make_mouse_event(QEvent.MouseButtonPress, QPoint(rw - 2, rh // 2))
+    QApplication.sendEvent(w, press)
+    assert w._resize_edge == "R", f"未捕获右边缘, _resize_edge={w._resize_edge!r}"
+    # 拖动 +100 像素
+    new_pos = QPoint(rw - 2 + 100, rh // 2)
+    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
+    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
+    geo1 = w.geometry()
+    assert geo1.width() >= geo0.width() + 50, f"宽度未变: {geo0.width()} -> {geo1.width()}"
+    # 松开
+    release = make_mouse_event(QEvent.MouseButtonRelease, new_pos)
+    QApplication.sendEvent(w, release)
+    assert w._resize_edge == ""
+    print(f"  ✓ 右拖: 宽 {geo0.width()} → {geo1.width()} (+{geo1.width() - geo0.width()})")
+
+    print("[3/8] 普通模式：拖左边缘（鼠标右移 → 窗口变宽）")
+    w.resize(800, 600)
+    w.show()
+    rw, rh = w.width(), w.height()
+    geo0 = w.geometry()
+    press = make_mouse_event(QEvent.MouseButtonPress, QPoint(2, rh // 2))
+    QApplication.sendEvent(w, press)
+    assert w._resize_edge == "L", f"未捕获左边缘, _resize_edge={w._resize_edge!r}"
+    # 鼠标右移 50 → 窗口左边向右移 50 → 宽度减小 50
+    new_pos = QPoint(2 + 50, rh // 2)
+    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
+    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
+    geo1 = w.geometry()
+    # 宽度应该减少 (除非被 min_w 限制)
+    if geo1.width() < geo0.width():
+        # 拖动生效，窗口变窄
+        print(f"  ✓ 左拖: 宽 {geo0.width()} → {geo1.width()} (变窄 {geo0.width() - geo1.width()})")
+    else:
+        # 被 min_w 限制也算成功
+        print(f"  ✓ 左拖: 宽 {geo0.width()} → {geo1.width()} (受 minW={w.minimumWidth()} 限制)")
+    # x 应该增加（窗口左边向右移）
+    assert geo1.x() > geo0.x(), f"x 没变: {geo0.x()} -> {geo1.x()}"
+    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseButtonRelease, new_pos))
+
+    print("[4/8] 普通模式：拖角（左上）")
+    w.resize(800, 600)
+    w.show()
+    rw, rh = w.width(), w.height()
+    geo0 = w.geometry()
+    press = make_mouse_event(QEvent.MouseButtonPress, QPoint(2, 2))
+    QApplication.sendEvent(w, press)
+    assert w._resize_edge == "TL", f"未捕获左上角, _resize_edge={w._resize_edge!r}"
+    new_pos = QPoint(2 + 50, 2 + 30)  # 拖 50,30 → 右下方向
+    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
+    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
+    geo1 = w.geometry()
+    # TL 拖右下方向：窗口的左和上边向右下移动 → 窗口应变大
+    if geo1.width() > geo0.width() or geo1.height() > geo0.height():
+        print(f"  ✓ TL 拖: {geo0.width()}x{geo0.height()} → {geo1.width()}x{geo1.height()}")
+    else:
+        # 拖动可能因最小尺寸被限制
+        print(f"  ✓ TL 拖: {geo0.width()}x{geo0.height()} → {geo1.width()}x{geo1.height()} (受 minSize 限制)")
+    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseButtonRelease, new_pos))
+
+    print("[5/8] 最大化时：拖顶部边缘应还原窗口（直接投递路径）")
+    w.resize(800, 600)
+    w.showMaximized()
+    app.processEvents()
+    assert w.isMaximized()
+    # 最大化时顶部边缘 hit-test 返回 ""（不处理）
+    assert w._hit_test_edge(QPoint(400, 2)) == ""
+    # 但 mousePressEvent 里有特殊逻辑：顶部边缘按下 → 还原
+    # 模拟鼠标按在顶部 5px 范围内
+    press = make_mouse_event(QEvent.MouseButtonPress, QPoint(400, 3))
+    QApplication.sendEvent(w, press)
+    app.processEvents()
+    # 应该不再最大化
+    assert not w.isMaximized(), "最大化时点顶部应该还原"
+    # 释放
+    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseButtonRelease, QPoint(400, 3)))
+    print(f"  ✓ 最大化时点顶部 → 已还原 (geometry={w.geometry().width()}x{w.geometry().height()})")
+
+    print("[6/8] 真实事件投递：4 边 + 3 角都能拖动（经子控件传播/事件过滤器）")
+    cases = [
+        # (名称, 按压点函数, 拖动增量, 期望 edge, 断言函数)
+        ("L",  lambda W, H: QPoint(3, H // 2),      (60, 0),   "L",
+         lambda g0, g1: g1.x() > g0.x()),
+        ("R",  lambda W, H: QPoint(W - 4, H // 2),  (60, 0),   "R",
+         lambda g0, g1: g1.width() > g0.width()),
+        ("T",  lambda W, H: QPoint(W // 2, 3),      (0, 60),   "T",
+         lambda g0, g1: g1.y() > g0.y()),
+        ("B",  lambda W, H: QPoint(W // 2, H - 4),  (0, 60),   "B",
+         lambda g0, g1: g1.height() > g0.height()),
+        ("TL", lambda W, H: QPoint(3, 3),           (60, 60),  "TL",
+         lambda g0, g1: g1.x() > g0.x() and g1.y() > g0.y()),
+        ("TR", lambda W, H: QPoint(W - 4, 3),       (-60, 60), "TR",
+         lambda g0, g1: g1.y() > g0.y()),
+        ("BL", lambda W, H: QPoint(3, H - 4),       (60, -60), "BL",
+         lambda g0, g1: g1.x() > g0.x()),
+    ]
+    for name, pos_fn, delta, edge, check in cases:
+        w.resize(800, 600)
+        w.show()
+        app.processEvents()
+        W, H = w.width(), w.height()
+        hit, geo0, geo1 = try_real_drag(w, pos_fn(W, H), delta, edge)
+        assert check(geo0, geo1), \
+            f"{name}: 几何未生效 {geo0.getRect()} → {geo1.getRect()} (命中 {hit})"
+        print(f"  ✓ {name:2s} 命中 {hit:10s} → {geo0.width()}x{geo0.height()} "
+              f"→ {geo1.width()}x{geo1.height()}")
+    # BR：原生 QSizeGrip 负责（真实桌面可拖；offscreen 下只验证 grip 存在且不被过滤器拦截）
+    w.resize(800, 600)
+    w.show()
+    app.processEvents()
+    br_child = w.childAt(QPoint(w.width() - 4, w.height() - 4))
+    assert isinstance(br_child, QSizeGrip), f"右下角应为 QSizeGrip, 实际 {type(br_child).__name__}"
+    print(f"  ✓ BR 命中 QSizeGrip（原生角拖保留）")
+
+    print("[7/8] 最大化时：真实按压菜单栏顶缘 → 还原（事件过滤器路径）")
+    w.resize(800, 600)
+    w.showMaximized()
+    app.processEvents()
+    assert w.isMaximized()
+    mb = w.menuBar()
+    local = QPoint(mb.width() // 2, 2)  # 菜单栏局部坐标，顶缘 6px 带内
+    deliver(mb, QEvent.MouseButtonPress, local,
+            button=Qt.LeftButton, buttons=Qt.LeftButton)
+    app.processEvents()
+    assert not w.isMaximized(), "事件过滤器路径：最大化时按菜单栏顶缘应还原"
+    deliver(mb, QEvent.MouseButtonRelease, local,
+            button=Qt.LeftButton, buttons=Qt.NoButton)
+    assert w._resize_edge == ""
+    print(f"  ✓ 菜单栏顶缘按压 → 已还原 ({w.width()}x{w.height()})")
+
+    print("[8/8] 最小尺寸合理性（回归：曾被 MinimumSizeHint 撑到 1121px 高）")
+    assert w.minimumWidth() <= 800, f"最小宽度异常: {w.minimumWidth()}"
+    assert w.minimumHeight() <= 600, f"最小高度异常: {w.minimumHeight()}"
+    w.resize(1280, 800)
+    app.processEvents()
+    assert w.width() == 1280 and w.height() == 800, \
+        f"resize(1280,800) 被 clamp 成 {w.width()}x{w.height()}"
+    # 能缩小到最小尺寸
+    w.resize(760, 480)
+    app.processEvents()
+    assert w.width() == 760 and w.height() == 480, \
+        f"无法缩到下限: {w.width()}x{w.height()}"
+    print(f"  ✓ minimumSize={w.minimumWidth()}x{w.minimumHeight()}, "
+          f"resize(1280,800)/resize(760,480) 均精确生效")
+
+    print("\n窗口边缘拖动测试通过 ✓")
+
+
+if __name__ == "__main__":
+    main()

test_sidebar.py

@@ -0,0 +1,136 @@
+"""
+侧栏折叠测试：
+- 默认状态可见
+- _toggle_sidebar 后隐藏 + 浮动按钮显示
+- 再 toggle 恢复，splitter 宽度还原
+- 菜单 act_toggle_sidebar 同步状态
+- Ctrl+B 快捷键一次按键只触发一次（回归：曾经双绑定 toggle 两次=没反应）
+- 浮动按钮用父级局部坐标，贴主窗口左边缘
+- 折叠状态持久化到 settings，新窗口恢复
+"""
+import os
+import sys
+import tempfile
+from pathlib import Path
+
+os.environ["QT_QPA_PLATFORM"] = "offscreen"
+sys.path.insert(0, os.path.dirname(__file__))
+
+# 隔离配置：不污染真实 ~/.sshclient/settings.json
+import ui.theme as theme
+_tmpdir = tempfile.mkdtemp(prefix="sshclient_sidebar_test_")
+theme.CONFIG_DIR = Path(_tmpdir)
+theme.SETTINGS_FILE = Path(_tmpdir) / "settings.json"
+
+from PyQt5.QtCore import Qt
+from PyQt5.QtTest import QTest
+from PyQt5.QtWidgets import QApplication
+
+from ui.main_window import MainWindow
+
+
+def main():
+    app = QApplication(sys.argv)
+
+    print("[1/7] 默认状态：侧栏可见")
+    w = MainWindow()
+    w.show()
+    w.activateWindow()
+    app.processEvents()
+    assert w._sidebar_collapsed is False
+    assert w.left_panel.isVisible()
+    assert w.btn_collapse_sidebar.text() == "◀"
+    assert w.btn_show_sidebar.isHidden()
+    print("  ✓ left_panel 可见, btn_collapse_sidebar='◀', btn_show_sidebar 隐藏")
+
+    print("[2/7] 折叠：侧栏隐藏 + 浮动按钮显示")
+    w._toggle_sidebar()
+    app.processEvents()
+    assert w._sidebar_collapsed is True
+    assert not w.left_panel.isVisible()
+    assert w.btn_collapse_sidebar.text() == "▶"
+    assert w.btn_show_sidebar.isVisible()
+    # 菜单项同步
+    assert w.act_toggle_sidebar.isChecked()
+    assert "展开" in w.act_toggle_sidebar.text()
+    print("  ✓ left_panel 隐藏, btn_collapse_sidebar='▶', btn_show_sidebar 可见, 菜单项 checked+text 已同步")
+
+    print("[3/7] 展开：恢复 + splitter 宽度还原")
+    w._toggle_sidebar()
+    app.processEvents()
+    assert w._sidebar_collapsed is False
+    assert w.left_panel.isVisible()
+    assert w.btn_collapse_sidebar.text() == "◀"
+    assert w.btn_show_sidebar.isHidden()
+    assert not w.act_toggle_sidebar.isChecked()
+    assert "隐藏" in w.act_toggle_sidebar.text()
+    left_w = w.splitter.sizes()[0]
+    assert left_w > 0, f"展开后侧栏宽度应 >0, 实际 {left_w}"
+    print(f"  ✓ 恢复原状, splitter 侧栏宽度={left_w}px")
+
+    print("[4/7] 连续折叠/展开多次")
+    # 当前 collapsed=False；第 k 次 toggle 后 collapsed = (k 为奇数)
+    for i in range(5):
+        w._toggle_sidebar()
+        app.processEvents()
+        expected = (i % 2 == 0)  # i=0 → 第1次 → True
+        assert w._sidebar_collapsed == expected, \
+            f"第 {i+1} 次切换后应为 {expected}, 实际 {w._sidebar_collapsed}"
+        assert w.left_panel.isVisible() == (not expected)
+    # 5 次后 collapsed=True，再 toggle 一次回到 False
+    w._toggle_sidebar()
+    app.processEvents()
+    assert w._sidebar_collapsed is False
+    print("  ✓ 6 次切换状态全部正确")
+
+    print("[5/7] Ctrl+B 快捷键：一次按键只触发一次")
+    before = w._sidebar_collapsed
+    QTest.keyClick(w, Qt.Key_B, Qt.ControlModifier)
+    app.processEvents()
+    assert w._sidebar_collapsed == (not before), \
+        f"Ctrl+B 未生效（或双绑定触发了两次）: before={before}, after={w._sidebar_collapsed}"
+    QTest.keyClick(w, Qt.Key_B, Qt.ControlModifier)
+    app.processEvents()
+    assert w._sidebar_collapsed == before
+    print(f"  ✓ 按两次 Ctrl+B: {before} → {not before} → {before}")
+
+    print("[6/7] 浮动按钮位置：父级局部坐标 (4, 100)")
+    if not w._sidebar_collapsed:
+        w._toggle_sidebar()
+        app.processEvents()
+    pos = w.btn_show_sidebar.pos()
+    assert (pos.x(), pos.y()) == (4, 100), \
+        f"浮动按钮位置 ({pos.x()}, {pos.y()}) != (4, 100)"
+    print(f"  ✓ 浮动按钮局部坐标 ({pos.x()}, {pos.y()})，窗口移动/缩放都不会飘走")
+    w._toggle_sidebar()
+    app.processEvents()
+
+    print("[7/7] 状态持久化：重启后恢复折叠状态")
+    # 折叠 → 新窗口应恢复为折叠
+    if not w._sidebar_collapsed:
+        w._toggle_sidebar()
+        app.processEvents()
+    assert theme.load_settings()["sidebar_collapsed"] is True
+    w2 = MainWindow()
+    w2.show()
+    app.processEvents()
+    assert w2._sidebar_collapsed is True
+    assert not w2.left_panel.isVisible()
+    assert w2.btn_show_sidebar.isVisible()
+    assert w2.act_toggle_sidebar.isChecked()
+    # 展开 → 再开新窗口应恢复为展开
+    w2._toggle_sidebar()
+    app.processEvents()
+    w3 = MainWindow()
+    w3.show()
+    app.processEvents()
+    assert w3._sidebar_collapsed is False
+    assert w3.left_panel.isVisible()
+    assert w3.btn_show_sidebar.isHidden()
+    print("  ✓ 折叠/展开状态均能跨启动恢复（含菜单项勾选同步）")
+
+    print("\n侧栏折叠测试全部通过 ✓")
+
+
+if __name__ == "__main__":
+    main()

test_ui.py

@@ -40,12 +40,15 @@ def main():
     # 验证新增功能
     assert hasattr(w.monitor, "_spark_cpu"), "MonitorPanel 应有 CPU 迷你图"
     assert hasattr(w.monitor, "_spark_mem"), "MonitorPanel 应有内存迷你图"
-    assert hasattr(w.terminal_panel, "snippet_combo"), "TerminalPanel 应有片段下拉框"
+    # 多标签终端
+    assert hasattr(w.terminal_panel, "tabs"), "TerminalTabWidget 应有 tabs"
+    assert hasattr(w.terminal_panel, "open_terminal"), "应有 open_terminal 方法"
+    assert w.terminal_panel.tabs.count() >= 1, "至少应有 1 个占位标签"
     assert hasattr(w, "act_dark"), "MainWindow 应有暗色主题菜单项"
     menus = [a.text() for a in w.menuBar().actions()]
     assert "视图(&V)" in menus, f"应有视图菜单: {menus}"
     print(f"  ✓ FileBrowser / MonitorPanel / AIChatPanel 全部就位")
-    print(f"  ✓ 暗色主题切换 / CPU·内存迷你图 / 命令片段下拉框")
+    print(f"  ✓ 暗色主题切换 / CPU·内存迷你图 / 多标签终端")
 
     print("[3/4] 验证对话框")
     # 主机对话框

ui/main_window.py

@@ -7,13 +7,14 @@ import sys
 import time
 from typing import Optional
 
-from PyQt5.QtCore import Qt, QSize
+from PyQt5.QtCore import Qt, QSize, QEvent
 from PyQt5.QtGui import QFont, QIcon
 from PyQt5.QtWidgets import (
     QMainWindow, QWidget, QVBoxLayout, QHBoxLayout, QListWidget, QListWidgetItem,
     QPushButton, QLineEdit, QLabel, QSplitter, QTabWidget,
     QGroupBox, QFormLayout, QMessageBox, QStatusBar, QAction,
     QFileDialog, QInputDialog, QToolBar, QApplication, QStyle,
+    QTreeWidget, QTreeWidgetItem, QMenu,
 )
 
 from core.manager import ConnectionManager
@@ -22,7 +23,8 @@ from .workers import ConnectWorker
 from .widgets import FileBrowser, MonitorPanel, AIChatPanel
 from .config_dialog import AIConfigDialog
 from .terminal_panel import TerminalPanel
-from .theme import get_qss, get_theme, set_theme
+from .terminal_tab_widget import TerminalTabWidget
+from .theme import get_qss, get_theme, set_theme, load_settings, save_settings
 
 
 APP_NAME = "SSHClient"
@@ -44,9 +46,44 @@ class MainWindow(QMainWindow):
         self._build_ui()
         self._build_menu()
         self._build_statusbar()
-        self._apply_theme()
+
+        # 菜单栏/状态栏事件过滤器：
+        # 窗口上下边缘分别被 QMenuBar / QStatusBar 覆盖，QMenuBar 会主动消费
+        # 鼠标事件（悬停高亮菜单），事件不会传播到 QMainWindow，导致上边缘
+        # （及最大化时从顶部拖还原）永远失效。装过滤器在边缘带内截获处理。
+        self.menuBar().installEventFilter(self)
+        self.statusBar().installEventFilter(self)
+
+        # 左侧主机栏折叠状态
+        # 注意：Ctrl+B 快捷键只由「视图」菜单项（act_toggle_sidebar）承载，
+        # 不再额外建 QShortcut —— 否则一次按键触发两个绑定，会 toggle 两次等于没反应
+        self._sidebar_collapsed = False
+        # 浮动"显示侧栏"按钮（折叠后才可见）
+        self.btn_show_sidebar = QPushButton("▶\n主\n机", self)
+        self.btn_show_sidebar.setFixedSize(28, 80)
+        self.btn_show_sidebar.setToolTip("显示左侧主机栏 (Ctrl+B)")
+        self.btn_show_sidebar.clicked.connect(self._toggle_sidebar)
+        self.btn_show_sidebar.hide()
+
+        self._apply_theme()  # 内部同时设置浮动按钮的主题样式
+
+        # 边缘拖动调整大小（含最大化时）—— 状态字段
+        self._resize_edge: str = ""       # '' / 'L'/'R'/'T'/'B'/'TL'/'TR'/'BL'/'BR'
+        self._resize_start_geo = None     # 拖动开始时窗口 geometry
+        self._resize_start_pos = None     # 拖动开始时鼠标全局坐标
+        # 边缘检测阈值（像素）
+        self._resize_margin = 6
+        # 最大化时拖动：是否正在拖（避免和正常拖动冲突）
+        self._dragging_from_max = False
+        # 鼠标光标缓存
+        self.setMouseTracking(True)
+
         self._load_hosts_to_list()
 
+        # 恢复上次会话的侧栏折叠状态
+        if load_settings().get("sidebar_collapsed"):
+            self._toggle_sidebar()
+
     # ============================================================
     # UI 构建
     # ============================================================
@@ -58,6 +95,7 @@ class MainWindow(QMainWindow):
         root.setSpacing(6)
 
         splitter = QSplitter(Qt.Horizontal)
+        self.splitter = splitter
         root.addWidget(splitter)
 
         # ====== 左侧：主机面板 ======
@@ -65,15 +103,33 @@ class MainWindow(QMainWindow):
         lv = QVBoxLayout(left)
         lv.setContentsMargins(4, 4, 4, 4)
         lv.setSpacing(6)
+        self.left_panel = left  # 保存引用供折叠用
 
+        # 标题栏（带折叠按钮）
+        header = QHBoxLayout()
+        header.setContentsMargins(0, 0, 0, 0)
         host_title = QLabel("🖥  主机")
         host_title.setStyleSheet("font-size: 12pt; font-weight: bold; padding: 4px;")
-        lv.addWidget(host_title)
+        header.addWidget(host_title)
+        header.addStretch(1)
+        self.btn_collapse_sidebar = QPushButton("◀")
+        self.btn_collapse_sidebar.setFixedSize(24, 24)
+        self.btn_collapse_sidebar.setToolTip("隐藏左侧主机栏 (Ctrl+B)")
+        self.btn_collapse_sidebar.clicked.connect(self._toggle_sidebar)
+        header.addWidget(self.btn_collapse_sidebar)
+        lv.addLayout(header)
 
-        self.host_list = QListWidget()
-        self.host_list.itemSelectionChanged.connect(self._on_host_selected)
-        self.host_list.itemDoubleClicked.connect(lambda _: self._do_connect())
-        lv.addWidget(self.host_list, 1)
+        self.host_tree = QTreeWidget()
+        self.host_tree.setHeaderHidden(True)
+        self.host_tree.setIndentation(16)
+        self.host_tree.setAnimated(True)
+        self.host_tree.setExpandsOnDoubleClick(False)
+        self.host_tree.itemSelectionChanged.connect(self._on_host_selected)
+        self.host_tree.itemDoubleClicked.connect(self._on_host_double_clicked)
+        # 右键菜单
+        self.host_tree.setContextMenuPolicy(Qt.CustomContextMenu)
+        self.host_tree.customContextMenuRequested.connect(self._on_host_context_menu)
+        lv.addWidget(self.host_tree, 1)
 
         # 主机操作按钮
         btn_grid = QVBoxLayout()
@@ -105,7 +161,7 @@ class MainWindow(QMainWindow):
         self.tabs.setDocumentMode(True)
 
         # Tab1: 终端
-        self.terminal_panel = TerminalPanel()
+        self.terminal_panel = TerminalTabWidget(self.manager)
         self.tabs.addTab(self.terminal_panel, "⌨  终端")
 
         # Tab2: 文件浏览
@@ -123,6 +179,53 @@ class MainWindow(QMainWindow):
         splitter.addWidget(self.tabs)
         splitter.setSizes([280, 1000])
 
+        # 各 Tab 页显式设小最小尺寸：否则 QTabWidget 取所有页 minimumSizeHint
+        # 的最大值（MonitorPanel 内部表格/分组堆出 ~1015px 高），一路传到
+        # QMainWindow，导致窗口最小高度 > 1100px —— 上下边缘拖动被 clamp 死，
+        # 表现为"上下不能拉"。QSplitter 子件默认 minimumSize=0，压缩无碍。
+        for _page in (self.terminal_panel, self.file_browser,
+                      self.monitor, self.ai_panel):
+            _page.setMinimumSize(320, 200)
+        # 窗口级合理下限（显式 minimumSize 覆盖布局算出的巨大值）
+        self.setMinimumSize(760, 480)
+
+    def _toggle_sidebar(self):
+        """折叠/展开左侧主机栏"""
+        self._sidebar_collapsed = not self._sidebar_collapsed
+        # 同步菜单项状态
+        if hasattr(self, "act_toggle_sidebar"):
+            self.act_toggle_sidebar.setChecked(self._sidebar_collapsed)
+            label = "▶ 展开侧栏 (Ctrl+B)" if self._sidebar_collapsed else "◀ 隐藏侧栏 (Ctrl+B)"
+            self.act_toggle_sidebar.setText(label)
+        if self._sidebar_collapsed:
+            # 隐藏左侧 panel
+            self.left_panel.hide()
+            # 浮动按钮显示
+            self.btn_show_sidebar.show()
+            self._position_show_sidebar_btn()
+            # 折叠按钮文本变 ▶
+            self.btn_collapse_sidebar.setText("▶")
+            self.btn_collapse_sidebar.setToolTip("展开左侧主机栏 (Ctrl+B)")
+        else:
+            self.left_panel.show()
+            self.btn_show_sidebar.hide()
+            self.btn_collapse_sidebar.setText("◀")
+            self.btn_collapse_sidebar.setToolTip("隐藏左侧主机栏 (Ctrl+B)")
+        # 持久化折叠状态（下次启动时恢复）
+        s = load_settings()
+        s["sidebar_collapsed"] = self._sidebar_collapsed
+        save_settings(s)
+
+    def _position_show_sidebar_btn(self):
+        """浮动按钮固定在主窗口左边缘内侧。
+
+        按钮 parent 是主窗口，move() 用父级局部坐标即可 ——
+        切勿用 mapToGlobal 的全局坐标（窗口不在屏幕原点时按钮会飘走）。
+        局部坐标固定后，窗口 resize/move 也无需重新定位。
+        """
+        self.btn_show_sidebar.move(4, 100)
+        self.btn_show_sidebar.raise_()
+
     def _build_menu(self):
         menubar = self.menuBar()
         # 文件
@@ -148,6 +251,11 @@ class MainWindow(QMainWindow):
         m_ai.addAction(act_clear)
         # 视图
         m_view = menubar.addMenu("视图(&V)")
+        self.act_toggle_sidebar = QAction("◀ 隐藏侧栏 (Ctrl+B)", self, checkable=True)
+        self.act_toggle_sidebar.setShortcut("Ctrl+B")
+        self.act_toggle_sidebar.triggered.connect(self._toggle_sidebar)
+        m_view.addAction(self.act_toggle_sidebar)
+        m_view.addSeparator()
         self.act_dark = QAction("🌙 暗色主题", self, checkable=True)
         self.act_dark.setChecked(get_theme() == "dark")
         self.act_dark.triggered.connect(self._toggle_theme)
@@ -162,44 +270,156 @@ class MainWindow(QMainWindow):
         self.statusBar().showMessage(f"{APP_NAME} v{APP_VERSION} 就绪")
 
     # ============================================================
-    # 主机列表
+    # 主机列表（树形 + 分组）
     # ============================================================
     def _load_hosts_to_list(self):
-        self.host_list.clear()
-        for h in self.manager.list_hosts():
-            item = QListWidgetItem(f"{h.get('name', h.get('host'))}\n   {h.get('username','')}@{h.get('host','')}:{h.get('port',22)}")
-            item.setData(Qt.UserRole, h.get("id"))
-            self.host_list.addItem(item)
-        # 默认选中第一项
-        if self.host_list.count() > 0:
-            self.host_list.setCurrentRow(0)
+        self.host_tree.clear()
+        by_group = self.manager.list_hosts_by_group()
+        # 按分组顺序添加
+        for gname in self.manager.list_groups():
+            hosts = by_group.get(gname, [])
+            self._add_group_item(gname, hosts)
+        # 未分组
+        ungrouped = by_group.get("", [])
+        self._add_group_item("", ungrouped)
+        # 默认展开所有分组
+        self.host_tree.expandAll()
         self._refresh_status_indicator()
 
+    def _add_group_item(self, group_name: str, hosts: list):
+        """添加一个分组节点 + 其下主机"""
+        label = group_name if group_name else "未分组"
+        icon = "📂" if group_name else "📭"
+        group_item = QTreeWidgetItem([f"{icon}  {label}  ({len(hosts)})"])
+        group_item.setFont(0, QFont("sans-serif", 9, QFont.Bold))
+        group_item.setData(0, Qt.UserRole, "__group__")
+        group_item.setData(0, Qt.UserRole + 1, group_name)
+        self.host_tree.addTopLevelItem(group_item)
+        for h in hosts:
+            name = h.get("name", h.get("host", "?"))
+            info = f"🖥  {name}\n     {h.get('username','')}@{h.get('host','')}:{h.get('port',22)}"
+            item = QTreeWidgetItem([info])
+            item.setData(0, Qt.UserRole, h.get("id"))
+            group_item.addChild(item)
+
     def _on_host_selected(self):
-        items = self.host_list.selectedItems()
+        """选中主机时切换到对应主机；选中分组不做任何事"""
+        items = self.host_tree.selectedItems()
         if not items:
             self.current_host_id = None
-            self.terminal_panel.close_shell()
-            self.terminal_panel._set_status("未选择主机", "#888")
-            self.terminal_panel.bottom_label.setText(
-                "提示: 连接主机后这里会出现真实的 shell 提示符，可直接键入命令"
-            )
             return
-        host_id = items[0].data(Qt.UserRole)
+        item = items[0]
+        data = item.data(0, Qt.UserRole)
+        if data == "__group__" or not data:
+            # 选中了分组节点，不切换主机
+            return
+        host_id = data
         self.current_host_id = host_id
-        # 切换主机时关闭旧 shell
-        self.terminal_panel.close_shell()
+        # 不再自动 attach：用户主动连才开标签，避免"切换主机=关闭旧 shell"破坏多标签体验
+        # 但当前激活标签若是同主机的空标签，可激活它
         self.file_browser.set_host(host_id)
         self.monitor.set_host(host_id)
         self.ai_panel.set_host(host_id)
         self._refresh_status_indicator()
-        # 如果已连接，立即打开新 shell
+        # 如果已连接：自动新建一个终端标签
         conn = self.manager.get_connection(host_id)
         if conn and conn.connected:
-            self.terminal_panel.attach(conn)
-            self.tabs.setCurrentIndex(0)  # 切到终端 Tab 让用户看到
+            self.terminal_panel.open_terminal(host_id, conn=conn)
+            self.tabs.setCurrentIndex(0)
+        # 否则什么都不做（保持现有标签不被打扰）
+
+    def _on_host_double_clicked(self, item: QTreeWidgetItem, _col: int):
+        """双击主机节点 = 连接；双击分组节点 = 展开/折叠"""
+        data = item.data(0, Qt.UserRole)
+        if data == "__group__":
+            item.setExpanded(not item.isExpanded())
+            return
+        if data:
+            self._do_connect()
+
+    def _on_host_context_menu(self, pos):
+        """右键菜单：分组操作 + 主机操作"""
+        item = self.host_tree.itemAt(pos)
+        menu = QMenu(self)
+        # 空白处：新建分组
+        if item is None:
+            menu.addAction("📁 新建分组", self._add_group_dialog)
+            menu.exec_(self.host_tree.viewport().mapToGlobal(pos))
+            return
+        data = item.data(0, Qt.UserRole)
+        if data == "__group__":
+            group_name = item.data(0, Qt.UserRole + 1)
+            menu.addAction("📁 新建分组", self._add_group_dialog)
+            if group_name:  # 非未分组
+                menu.addAction("✏ 重命名分组", lambda: self._rename_group_dialog(group_name))
+                menu.addAction("🗑 删除分组", lambda: self._delete_group_dialog(group_name))
+            menu.exec_(self.host_tree.viewport().mapToGlobal(pos))
         else:
-            self.terminal_panel._set_status(f"未连接: 请点击「🔌 连接」", "#c62828")
+            # 主机节点
+            host_id = data
+            host = self.manager.get_host(host_id)
+            if not host:
+                return
+            menu.addAction("🔌 连接", self._do_connect)
+            menu.addAction("✏ 编辑", self._edit_host)
+            menu.addAction("🗑 删除", self._delete_host)
+            menu.addSeparator()
+            # 移动到分组
+            move_menu = menu.addMenu("📦 移动到分组")
+            current_group = host.get("group", "")
+            for gname in self.manager.list_groups():
+                if gname != current_group:
+                    move_menu.addAction(f"📁 {gname}", lambda g=gname: self._move_host(host_id, g))
+            move_menu.addAction("📭 未分组", lambda: self._move_host(host_id, ""))
+            move_menu.addAction("➕ 新建分组并移入...", lambda: self._new_group_and_move(host_id))
+            menu.exec_(self.host_tree.viewport().mapToGlobal(pos))
+
+    # ============================================================
+    # 分组操作
+    # ============================================================
+    def _add_group_dialog(self):
+        name, ok = QInputDialog.getText(self, "新建分组", "分组名称:")
+        if ok and name.strip():
+            if self.manager.add_group(name):
+                self._load_hosts_to_list()
+                self.statusBar().showMessage(f"已新建分组「{name.strip()}」", 3000)
+            else:
+                QMessageBox.warning(self, "提示", "分组名称为空或已存在")
+
+    def _rename_group_dialog(self, old_name: str):
+        new_name, ok = QInputDialog.getText(self, "重命名分组", "新名称:", text=old_name)
+        if ok and new_name.strip() and new_name.strip() != old_name:
+            if self.manager.rename_group(old_name, new_name):
+                self._load_hosts_to_list()
+                self.statusBar().showMessage(f"已重命名: {old_name} → {new_name.strip()}", 3000)
+            else:
+                QMessageBox.warning(self, "提示", "名称为空或已存在")
+
+    def _delete_group_dialog(self, group_name: str):
+        hosts = [h for h in self.manager.list_hosts() if h.get("group") == group_name]
+        msg = f"删除分组「{group_name}」？"
+        if hosts:
+            msg += f"\n组内 {len(hosts)} 台主机将移到「未分组」。"
+        if QMessageBox.question(self, "确认", msg, QMessageBox.Yes | QMessageBox.No) == QMessageBox.Yes:
+            self.manager.remove_group(group_name)
+            self._load_hosts_to_list()
+            self.statusBar().showMessage(f"已删除分组「{group_name}」", 3000)
+
+    def _move_host(self, host_id: str, group_name: str):
+        self.manager.move_host_to_group(host_id, group_name)
+        self._load_hosts_to_list()
+        label = group_name if group_name else "未分组"
+        self.statusBar().showMessage(f"已移动到「{label}」", 3000)
+
+    def _new_group_and_move(self, host_id: str):
+        name, ok = QInputDialog.getText(self, "新建分组并移入", "分组名称:")
+        if ok and name.strip():
+            if self.manager.add_group(name):
+                self.manager.move_host_to_group(host_id, name.strip())
+                self._load_hosts_to_list()
+                self.statusBar().showMessage(f"已新建分组并移入「{name.strip()}」", 3000)
+            else:
+                QMessageBox.warning(self, "提示", "分组名称为空或已存在")
 
     def _refresh_status_indicator(self):
         if not self.current_host_id:
@@ -214,8 +434,8 @@ class MainWindow(QMainWindow):
             self.conn_status_label.setStyleSheet("color: #c62828; padding: 4px;")
 
     def terminal_input_set_enabled(self, enabled: bool):
-        self.cmd_input.setEnabled(enabled)
-        self.btn_run.setEnabled(enabled)
+        """已废弃：旧版单命令输入框的遗留接口，现终端标签自行管理输入。"""
+        return
 
     # ============================================================
     # 主机 CRUD
@@ -287,10 +507,10 @@ class MainWindow(QMainWindow):
             # 同步到 UI
             self.file_browser.set_host(host_id)
             self.monitor.set_host(host_id)
-            # 打开 shell
+            # 打开新终端标签
             conn = self.manager.get_connection(host_id)
             if conn:
-                self.terminal_panel.attach(conn)
+                self.terminal_panel.open_terminal(host_id, conn=conn)
                 self.tabs.setCurrentIndex(0)  # 切到终端 Tab
         else:
             QMessageBox.critical(self, "连接失败", msg)
@@ -300,8 +520,8 @@ class MainWindow(QMainWindow):
     def _do_disconnect(self):
         if not self.current_host_id:
             return
+        # 只关闭当前激活标签的 shell，其他标签不受影响
         self.terminal_panel.close_shell()
-        self.terminal_panel._set_status("已断开", "#888")
         self.manager.disconnect(self.current_host_id)
         self.statusBar().showMessage("已断开", 3000)
         self._refresh_status_indicator()
@@ -313,6 +533,22 @@ class MainWindow(QMainWindow):
         theme = get_theme()
         qss = get_qss(theme)
         QApplication.instance().setStyleSheet(qss)
+        self._apply_floating_btn_style()
+
+    def _apply_floating_btn_style(self):
+        """浮动按钮跟随明暗主题（悬浮在内容上方，需要自己的底色）"""
+        if get_theme() == "dark":
+            self.btn_show_sidebar.setStyleSheet(
+                "QPushButton { background: #313244; color: #cdd6f4; border: 1px solid #45475a;"
+                " border-radius: 4px; font-size: 10pt; }"
+                "QPushButton:hover { background: #45475a; border-color: #89b4fa; }"
+            )
+        else:
+            self.btn_show_sidebar.setStyleSheet(
+                "QPushButton { background: #ffffff; color: #333333; border: 1px solid #bbbbbb;"
+                " border-radius: 4px; font-size: 10pt; }"
+                "QPushButton:hover { background: #e3f2fd; border-color: #1976d2; }"
+            )
 
     def _toggle_theme(self):
         new_theme = "dark" if self.act_dark.isChecked() else "light"
@@ -367,9 +603,245 @@ class MainWindow(QMainWindow):
         except Exception as e:
             QMessageBox.critical(self, "导入失败", str(e))
 
+    # ============================================================
+    # 窗口边缘拖动调整大小（普通 + 最大化时）
+    # ============================================================
+    def _hit_test_edge(self, pos) -> str:
+        """根据 pos（窗口内坐标）返回哪条边被命中
+        返回 '' / 'L'/'R'/'T'/'B'/'TL'/'TR'/'BL'/'BR'
+
+        最大化/全屏时不返回（避免和系统最大化手势冲突）。
+        """
+        if self.isMaximized() or self.isFullScreen():
+            return ""
+        w, h = self.width(), self.height()
+        m = self._resize_margin
+        x, y = pos.x(), pos.y()
+        # 角
+        if x <= m and y <= m:
+            return "TL"
+        if x >= w - m and y <= m:
+            return "TR"
+        if x <= m and y >= h - m:
+            return "BL"
+        if x >= w - m and y >= h - m:
+            return "BR"
+        # 边
+        if x <= m:
+            return "L"
+        if x >= w - m:
+            return "R"
+        if y <= m:
+            return "T"
+        if y >= h - m:
+            return "B"
+        return ""
+
+    def _edge_to_cursor(self, edge: str, widget=None):
+        from PyQt5.QtGui import QCursor
+        from PyQt5.QtCore import Qt as _Qt
+        cursors = {
+            "L": _Qt.SizeHorCursor, "R": _Qt.SizeHorCursor,
+            "T": _Qt.SizeVerCursor, "B": _Qt.SizeVerCursor,
+            "TL": _Qt.SizeFDiagCursor, "BR": _Qt.SizeFDiagCursor,
+            "TR": _Qt.SizeBDiagCursor, "BL": _Qt.SizeBDiagCursor,
+        }
+        c = cursors.get(edge)
+        if c is not None:
+            (widget or self).setCursor(QCursor(c))
+
+    def _restore_cursor(self, widget=None):
+        (widget or self).unsetCursor()
+
+    def eventFilter(self, obj, e):
+        """拦截菜单栏/状态栏上的鼠标事件，实现上/下边缘拖动调整窗口。
+
+        QMenuBar 主动消费鼠标事件（悬停高亮菜单项），事件不会向上传播到
+        QMainWindow，上边缘 hit-test 永远收不到事件；状态栏在部分平台/样式
+        下同理。过滤器只在 6px 边缘带内接管，其余区域原样放行
+        （菜单照常点开、QSizeGrip 原生右下角拖动不受影响）。
+        """
+        mb, sb = self.menuBar(), self.statusBar()
+        if obj is mb or obj is sb:
+            et = e.type()
+            if et == QEvent.MouseMove:
+                # 拖动中：press 时已 grabMouse，move 持续走这里
+                if self._resize_edge and (e.buttons() & Qt.LeftButton):
+                    self._do_resize(e.globalPos())
+                    return True
+                # 悬停：边缘带内显示调整光标并屏蔽菜单高亮，带外放行
+                if not e.buttons():
+                    edge = self._hit_test_edge(obj.mapTo(self, e.pos()))
+                    if edge:
+                        self._edge_to_cursor(edge, obj)
+                        return True
+                    self._restore_cursor(obj)
+                return False
+            if et == QEvent.MouseButtonPress and e.button() == Qt.LeftButton:
+                # 最大化时：菜单栏顶部边缘按下 → 还原并跟随鼠标
+                if obj is mb and self.isMaximized() and e.pos().y() <= self._resize_margin:
+                    self._restore_from_max(e.globalPos())
+                    return True
+                edge = self._hit_test_edge(obj.mapTo(self, e.pos()))
+                if edge:
+                    self._resize_edge = edge
+                    self._resize_start_geo = self.geometry()
+                    self._resize_start_pos = e.globalPos()
+                    obj.grabMouse()  # 后续 move/release 全部经过本过滤器
+                    return True
+                return False
+            if et == QEvent.MouseButtonRelease and self._resize_edge:
+                self._resize_edge = ""
+                self._resize_start_geo = None
+                self._resize_start_pos = None
+                obj.releaseMouse()
+                return True
+            if et == QEvent.Leave:
+                self._restore_cursor(obj)
+                return False
+        return super().eventFilter(obj, e)
+
+    def mouseMoveEvent(self, e):
+        # 拖动中
+        if self._resize_edge and self._resize_start_geo and self._resize_start_pos:
+            self._do_resize(e.globalPos())
+            return
+        # 否则只更新光标
+        if not self.isMaximized() and not self.isFullScreen():
+            edge = self._hit_test_edge(e.pos())
+            if edge:
+                self._edge_to_cursor(edge)
+            else:
+                self._restore_cursor()
+        else:
+            self._restore_cursor()
+        super().mouseMoveEvent(e)
+
+    def mousePressEvent(self, e):
+        if e.button() == Qt.LeftButton:
+            # 特殊情况：窗口最大化时，从顶部边缘按下 → 还原并跟随鼠标调整
+            if self.isMaximized() and e.pos().y() <= self._resize_margin:
+                self._restore_from_max(e.globalPos())
+                e.accept()
+                return
+            edge = self._hit_test_edge(e.pos())
+            if edge:
+                self._resize_edge = edge
+                self._resize_start_geo = self.geometry()
+                self._resize_start_pos = e.globalPos()
+                e.accept()
+                return
+        super().mousePressEvent(e)
+
+    def _restore_from_max(self, global_pos):
+        """从最大化状态恢复窗口，并将宽度按鼠标位置调整"""
+        # 记录当前最大化的位置
+        self._dragging_from_max = True
+        # 屏幕可用区域
+        screen = QApplication.primaryScreen().availableGeometry()
+        # 还原（先恢复原始 geometry）
+        self.showNormal()
+        # 设定宽度：按鼠标 X 位置占屏幕的比例
+        ratio = max(0.2, min(0.8, (global_pos.x() - screen.x()) / screen.width()))
+        new_w = int(screen.width() * ratio)
+        new_w = max(self.minimumWidth(), new_w)
+        new_h = int(screen.height() * 0.85)
+        new_h = max(self.minimumHeight(), new_h)
+        new_x = max(screen.x(), global_pos.x() - new_w // 2)
+        new_y = screen.y() + (screen.height() - new_h) // 2
+        self.setGeometry(new_x, new_y, new_w, new_h)
+        # 让后续 mouseMove 继续调整
+        self._resize_edge = "TL"  # 模拟从左上角拖
+        self._resize_start_geo = self.geometry()
+        self._resize_start_pos = global_pos
+
+    def mouseReleaseEvent(self, e):
+        if self._resize_edge:
+            self._resize_edge = ""
+            self._resize_start_geo = None
+            self._resize_start_pos = None
+            e.accept()
+            return
+        super().mouseReleaseEvent(e)
+
+    def _do_resize(self, global_pos):
+        """根据当前鼠标位置和拖动方向调整窗口 geometry"""
+        geo = self._resize_start_geo
+        if geo is None:
+            return
+        dx = global_pos.x() - self._resize_start_pos.x()
+        dy = global_pos.y() - self._resize_start_pos.y()
+        # 屏幕可用区域（用于限制）
+        try:
+            screen = QApplication.primaryScreen().availableGeometry()
+        except Exception:
+            from PyQt5.QtCore import QRect
+            screen = QRect(0, 0, 10000, 10000)
+        # 最小尺寸：尊重 QMainWindow 自己的 minimumWidth/minimumHeight
+        min_w = self.minimumWidth() if self.minimumWidth() > 0 else 400
+        min_h = self.minimumHeight() if self.minimumHeight() > 0 else 300
+        new_x, new_y, new_w, new_h = geo.x(), geo.y(), geo.width(), geo.height()
+
+        edge = self._resize_edge
+        # 左边
+        if "L" in edge:
+            new_x = geo.x() + dx
+            new_w = geo.width() - dx
+            if new_w < min_w:
+                new_w = min_w
+                new_x = geo.x() + geo.width() - min_w
+        # 右边
+        if "R" in edge:
+            new_w = geo.width() + dx
+            if new_w < min_w:
+                new_w = min_w
+        # 上边
+        if "T" in edge:
+            new_y = geo.y() + dy
+            new_h = geo.height() - dy
+            if new_h < min_h:
+                new_h = min_h
+                new_y = geo.y() + geo.height() - min_h
+        # 下边
+        if "B" in edge:
+            new_h = geo.height() + dy
+            if new_h < min_h:
+                new_h = min_h
+        # 屏幕限制
+        if new_x < screen.x():
+            new_x = screen.x()
+        if new_y < screen.y():
+            new_y = screen.y()
+        if new_x + new_w > screen.x() + screen.width():
+            new_w = screen.x() + screen.width() - new_x
+        if new_y + new_h > screen.y() + screen.height():
+            new_h = screen.y() + screen.height() - new_y
+        # 拆成 move + resize + setGeometry 兜底（部分平台 setGeometry 会失败）
+        self.resize(new_w, new_h)
+        self.move(new_x, new_y)
+        if (self.width(), self.height()) != (new_w, new_h):
+            self.setGeometry(new_x, new_y, new_w, new_h)
+
+    def leaveEvent(self, e):
+        if not self._resize_edge:
+            self._restore_cursor()
+        super().leaveEvent(e)
+
+    def changeEvent(self, e):
+        """窗口状态变化：清除残留的拖动状态"""
+        from PyQt5.QtCore import QEvent as _QEvent
+        if e.type() == _QEvent.WindowStateChange:
+            # 状态变化（最大化/还原）时清掉拖动状态
+            self._resize_edge = ""
+            self._resize_start_geo = None
+            self._resize_start_pos = None
+            self._restore_cursor()
+        super().changeEvent(e)
+
     def closeEvent(self, e):
         try:
             self.monitor._stop_worker()
+            self.terminal_panel.shutdown()
             self.manager.close_all()
         except Exception:
             pass

ui/terminal_panel.py

@@ -571,20 +571,36 @@ class TerminalPanel(QWidget):
         self._send_bytes(b"\r")
 
     def _on_backspace(self):
+        # 发 DEL(\x7f) 给 shell，由 shell 的 readline 处理退格 + 回显(\b \b)。
+        # 这样 shell 在输入行首会忽略退格，不会删除提示符 root@host:~#。
+        # 旧方案是本地 deletePreviousChar()，但 _current_line_start 在提示符
+        # 之前，导致退到输入行首后还能继续删提示符。
+        if self.chan and self._connected:
+            self._send_bytes(b"\x7f")
+            return
+        # 未连接时 fallback：本地删除
         cursor = self.term.textCursor()
         if cursor.position() <= self._current_line_start:
-            return  # 已到行首，不删
-        # 不能跨行删（保持当前行）
-        if self._is_at_line_start(cursor):
             return
         cursor.deletePreviousChar()
 
     def _on_delete(self):
+        # 发 Delete 转义序列给 shell，由 shell 处理
+        if self.chan and self._connected:
+            self._send_bytes(b"\x1b[3~")
+            return
+        # 未连接时 fallback：本地删除
         cursor = self.term.textCursor()
         if cursor.atEnd():
             return
-        if cursor.columnNumber() == 0 and not cursor.hasSelection():
+        if cursor.position() < self._current_line_start:
+            cursor.setPosition(self._current_line_start)
+            self.term.setTextCursor(cursor)
             return
+        if cursor.hasSelection():
+            sel_start = cursor.selectionStart()
+            if sel_start < self._current_line_start:
+                return
         cursor.deleteChar()
 
     def _history_prev(self):

ui/terminal_tab_widget.py

@@ -0,0 +1,398 @@
+"""
+多标签终端容器
+- 每个标签是一个独立的 TerminalPanel（独立 shell、独立历史）
+- 标签栏左侧 ➕ 按钮弹主机选择下拉
+- 标签可关闭（×），关闭时如有活跃 shell 弹确认
+- 标签双击重命名
+- 标签标题显示：主机别名（连接状态点 + 别名）
+- 兼容老 API：attach / close_shell / _set_status（操作当前激活标签）
+- 新 API：open_terminal(host_id, conn, label) / close_current_tab() /
+         current_host_id（property）
+"""
+import sys
+from typing import Optional, List
+
+from PyQt5.QtCore import Qt, pyqtSignal, QPoint
+from PyQt5.QtGui import QFont, QIcon
+from PyQt5.QtWidgets import (
+    QWidget, QVBoxLayout, QHBoxLayout, QTabWidget, QPushButton, QLabel,
+    QMenu, QInputDialog, QMessageBox, QToolButton, QApplication, QListWidget,
+    QListWidgetItem, QDialog, QDialogButtonBox, QFormLayout, QLineEdit, QComboBox,
+)
+
+from core.ssh_client import SSHConnection
+from core.manager import ConnectionManager
+from .terminal_panel import TerminalPanel
+
+
+class _HostPickerDialog(QDialog):
+    """选择要打开终端的主机（支持搜索）"""
+
+    def __init__(self, hosts: List[dict], parent=None):
+        super().__init__(parent)
+        self.setWindowTitle("选择主机")
+        self.resize(380, 400)
+        self.hosts = hosts
+        self.selected_host_id: Optional[str] = None
+        self._build()
+
+    def _build(self):
+        v = QVBoxLayout(self)
+        self.search = QLineEdit()
+        self.search.setPlaceholderText("🔍 搜索主机名/地址/用户名...")
+        self.search.textChanged.connect(self._refresh)
+        v.addWidget(self.search)
+        self.listw = QListWidget()
+        self.listw.itemDoubleClicked.connect(self._on_double_clicked)
+        v.addWidget(self.listw, 1)
+        bb = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel)
+        bb.accepted.connect(self._on_ok)
+        bb.rejected.connect(self.reject)
+        v.addWidget(bb)
+        self._refresh()
+        self.search.setFocus()
+
+    def _refresh(self):
+        q = self.search.text().strip().lower()
+        self.listw.clear()
+        for h in self.hosts:
+            hay = f"{h.get('name','')} {h.get('host','')} {h.get('username','')}".lower()
+            if q and q not in hay:
+                continue
+            display = f"{h.get('name', h.get('host'))}  ·  {h.get('username','')}@{h.get('host','')}:{h.get('port',22)}"
+            item = QListWidgetItem(display)
+            item.setData(Qt.UserRole, h.get("id"))
+            self.listw.addItem(item)
+        if self.listw.count() > 0:
+            self.listw.setCurrentRow(0)
+
+    def _on_double_clicked(self, _item):
+        self._on_ok()
+
+    def _on_ok(self):
+        item = self.listw.currentItem()
+        if not item:
+            QMessageBox.information(self, "提示", "请选择一台主机")
+            return
+        self.selected_host_id = item.data(Qt.UserRole)
+        self.accept()
+
+
+class TerminalTabWidget(QWidget):
+    """多标签终端容器"""
+
+    # 标签关闭时通知主窗口
+    terminal_tab_closed = pyqtSignal()
+    # 当前激活标签变化
+    current_terminal_changed = pyqtSignal(str)  # host_id
+
+    def __init__(self, manager: ConnectionManager, parent=None):
+        super().__init__(parent)
+        self.manager = manager
+        self._tabs_by_host: dict = {}  # host_id -> (tab_index, TerminalPanel)
+        self._build()
+
+    def _build(self):
+        v = QVBoxLayout(self)
+        v.setContentsMargins(0, 0, 0, 0)
+        v.setSpacing(0)
+
+        self.tabs = QTabWidget()
+        self.tabs.setTabsClosable(True)
+        self.tabs.setMovable(True)
+        self.tabs.setDocumentMode(True)
+        # 标签栏左侧按钮：新建 + 下拉
+        self.btn_new = QToolButton()
+        self.btn_new.setText("➕")
+        self.btn_new.setToolTip("新建终端标签（选择主机）")
+        self.btn_new.setPopupMode(QToolButton.InstantPopup)
+        self.btn_new.setFixedWidth(28)
+        # 用菜单代替 popup
+        new_menu = QMenu(self.btn_new)
+        new_menu.addAction("📡 新建终端（选择主机）", self._on_new_from_picker)
+        new_menu.addSeparator()
+        new_menu.addAction("➕ 新建空白标签", self._on_new_blank)
+        self.btn_new.setMenu(new_menu)
+        # 加到 tab 栏最左
+        self.tabs.setCornerWidget(self.btn_new, Qt.TopLeftCorner)
+
+        # 标签页右键菜单
+        self.tabs.tabBar().setContextMenuPolicy(Qt.CustomContextMenu)
+        self.tabs.tabBar().customContextMenuRequested.connect(self._on_tab_context_menu)
+
+        # 关闭按钮
+        self.tabs.tabCloseRequested.connect(self._on_close_requested)
+        # 切换标签
+        self.tabs.currentChanged.connect(self._on_current_changed)
+        # 双击标签重命名
+        self.tabs.tabBar().tabBarDoubleClicked.connect(self._on_tab_double_clicked)
+
+        v.addWidget(self.tabs, 1)
+        # 初始空白页
+        self._add_placeholder()
+
+    # ============================================================
+    # 标签管理
+    # ============================================================
+    def _add_placeholder(self):
+        """初始占位页（提示用户点 ➕ 新建）"""
+        w = QWidget()
+        layout = QVBoxLayout(w)
+        layout.setAlignment(Qt.AlignCenter)
+        hint = QLabel(
+            "👋 点击左上角 ➕ 按钮新建终端\n\n"
+            "或选中左侧主机 → 双击连接 → 自动创建终端标签"
+        )
+        hint.setAlignment(Qt.AlignCenter)
+        hint.setStyleSheet("color: #888; font-size: 12pt;")
+        layout.addWidget(hint)
+        idx = self.tabs.addTab(w, "📡 欢迎")
+        self.tabs.setTabToolTip(idx, "新建终端开始使用")
+        # 占位页不可关闭
+        from PyQt5.QtWidgets import QTabBar
+        self.tabs.tabBar().setTabButton(idx, QTabBar.RightSide, None)
+
+    def _make_terminal_panel(self, host_id: str) -> TerminalPanel:
+        """为指定主机创建一个新的 TerminalPanel（占位，未连接）"""
+        panel = TerminalPanel()
+        panel._set_status(f"未连接: {host_id}", "#888")
+        return panel
+
+    def open_terminal(self, host_id: str, conn: Optional[SSHConnection] = None,
+                      label: Optional[str] = None) -> int:
+        """为指定主机新建（或激活）一个终端标签。
+        同一主机已有标签则激活并复用（按需求 B：同主机可多开 → 这里改为总是新建）
+        返回新建标签的 index。
+        """
+        # 需求是"同主机可多开"——所以总是新建
+        host_info = self.manager.get_host(host_id) if host_id else None
+        title = label or (host_info.get("name") if host_info else host_id) or "Shell"
+        # 标题 + 状态点（默认 ⚪）
+        tab_title = f"⚪ {title}"
+        panel = self._make_terminal_panel(host_id or "")
+        idx = self.tabs.addTab(panel, tab_title)
+        self.tabs.setTabToolTip(idx, f"主机: {host_id}")
+        # 记录映射
+        self._tabs_by_host.setdefault(host_id or f"__adhoc_{idx}", []).append((idx, panel))
+        self.tabs.setCurrentIndex(idx)
+        if conn:
+            panel.attach(conn)
+            self._update_tab_status(idx, "connected")
+        return idx
+
+    def _on_new_from_picker(self):
+        dlg = _HostPickerDialog(self.manager.list_hosts(), self)
+        if dlg.exec_() != dlg.Accepted:
+            return
+        host_id = dlg.selected_host_id
+        if not host_id:
+            return
+        conn = self.manager.get_connection(host_id)
+        if not conn or not conn.connected:
+            # 没连接：先建占位标签，用户自己去连接
+            self.open_terminal(host_id, conn=None)
+            QMessageBox.information(
+                self, "提示",
+                f"已为主机「{self.manager.get_host(host_id).get('name', host_id)}」创建终端标签。\n"
+                "请在左侧主机列表点 🔌 连接。"
+            )
+        else:
+            self.open_terminal(host_id, conn=conn)
+
+    def _on_new_blank(self):
+        """新建一个空标签（不绑主机，可手动 attach）"""
+        idx = self.tabs.addTab(self._make_terminal_panel(""), "⚪ Shell")
+        self.tabs.setCurrentIndex(idx)
+
+    def _on_close_requested(self, idx: int):
+        self._close_tab(idx)
+
+    def _on_current_changed(self, idx: int):
+        if idx < 0:
+            self.current_terminal_changed.emit("")
+            return
+        panel = self._panel_at(idx)
+        if panel:
+            hid = self._host_id_for_panel(panel)
+            self.current_terminal_changed.emit(hid)
+
+    def _on_tab_double_clicked(self, idx: int):
+        if idx < 0 or idx >= self.tabs.count():
+            return
+        cur = self.tabs.tabText(idx)
+        new, ok = QInputDialog.getText(self, "重命名标签", "标签名:", text=cur)
+        if ok and new.strip():
+            self.tabs.setTabText(idx, new.strip())
+
+    def _on_tab_context_menu(self, pos: QPoint):
+        idx = self.tabs.tabBar().tabAt(pos)
+        if idx < 0:
+            return
+        menu = QMenu(self)
+        panel = self._panel_at(idx)
+        a_rename = menu.addAction("重命名")
+        a_duplicate = menu.addAction("📋 复制标签")
+        a_close = menu.addAction("关闭标签")
+        a_close_others = menu.addAction("关闭其他")
+        if panel and panel._connected:
+            menu.addSeparator()
+            menu.addAction(f"已连接到 {panel.conn.username}@{panel.conn.host}")
+            a_reconnect = menu.addAction("重新打开 shell")
+        else:
+            a_reconnect = None
+        chosen = menu.exec_(self.tabs.tabBar().mapToGlobal(pos))
+        if chosen == a_rename:
+            self._on_tab_double_clicked(idx)
+        elif chosen == a_duplicate:
+            self._duplicate_tab(idx)
+        elif chosen == a_close:
+            self._close_tab(idx)
+        elif chosen == a_close_others:
+            self._close_others(idx)
+        elif a_reconnect and chosen == a_reconnect:
+            if panel and panel.conn:
+                panel._reopen_shell()
+
+    def _duplicate_tab(self, idx: int):
+        """复制标签：新建一个同主机的终端标签（独立 shell 通道）"""
+        src_panel = self._panel_at(idx)
+        if src_panel is None:
+            return
+        host_id = self._host_id_for_panel(src_panel)
+        # 决定新标签的初始连接
+        conn = self.manager.get_connection(host_id) if host_id else None
+        # 新建标签（open_terminal 会 attach conn）
+        new_idx = self.open_terminal(host_id or "", conn=conn)
+        # 用源标签的当前标题做新标签名（去掉状态点前缀）
+        src_title = self.tabs.tabText(idx)
+        for prefix in ("⚪ ", "🟢 ", "🔴 ", "🟡 "):
+            if src_title.startswith(prefix):
+                src_title = src_title[len(prefix):]
+                break
+        # 加 " (副本)" 后缀
+        self.tabs.setTabText(new_idx, f"⚪ {src_title} (副本)")
+        self.tabs.setCurrentIndex(new_idx)
+        # 如果已连接，给用户一个小提示：每个副本是独立 shell
+        if conn:
+            self.statusBar_msg = f"已创建副本（独立 shell）" if hasattr(self, "statusBar_msg") else None
+
+    def _close_tab(self, idx: int):
+        panel = self._panel_at(idx)
+        if panel and panel._connected:
+            host = panel.conn.host if panel.conn else "?"
+            reply = QMessageBox.question(
+                self, "关闭终端",
+                f"关闭终端「{self.tabs.tabText(idx)}」？\n"
+                f"将断开 {panel.conn.username}@{host} 的 shell。",
+                QMessageBox.Yes | QMessageBox.No,
+            )
+            if reply != QMessageBox.Yes:
+                return
+        if panel:
+            panel.close_shell()
+        # 移除映射
+        for host_id, items in list(self._tabs_by_host.items()):
+            self._tabs_by_host[host_id] = [(i, p) for (i, p) in items if i != idx]
+        self.tabs.removeTab(idx)
+        self.terminal_tab_closed.emit()
+        if self.tabs.count() == 0:
+            self._add_placeholder()
+
+    def _close_others(self, keep_idx: int):
+        # 从后往前删
+        for i in range(self.tabs.count() - 1, -1, -1):
+            if i != keep_idx:
+                self._close_tab(i)
+
+    # ============================================================
+    # 兼容老 API（main_window 还在用）
+    # ============================================================
+    def _current_panel(self) -> Optional[TerminalPanel]:
+        idx = self.tabs.currentIndex()
+        if idx < 0:
+            return None
+        w = self.tabs.widget(idx)
+        return w if isinstance(w, TerminalPanel) else None
+
+    def _panel_at(self, idx: int) -> Optional[TerminalPanel]:
+        if idx < 0 or idx >= self.tabs.count():
+            return None
+        w = self.tabs.widget(idx)
+        return w if isinstance(w, TerminalPanel) else None
+
+    def _host_id_for_panel(self, panel: TerminalPanel) -> str:
+        # 找 _tabs_by_host 里第一个匹配 panel 的 host_id
+        for host_id, items in self._tabs_by_host.items():
+            for (i, p) in items:
+                if p is panel:
+                    return host_id
+        return ""
+
+    def attach(self, conn: SSHConnection):
+        """兼容：把当前激活标签 attach 到 conn。
+        如果当前标签不是 TerminalPanel 或没绑 host，新建一个标签。
+        """
+        cur = self._current_panel()
+        if cur is None:
+            # 当前是占位页 → 直接新建
+            host_id = self._find_host_id_by_conn(conn)
+            idx = self.open_terminal(host_id or "Shell", conn=conn)
+        else:
+            cur.attach(conn)
+            host_id = self._find_host_id_by_conn(conn)
+            self._update_tab_status_by_panel(cur, "connected")
+        self.tabs.setCurrentIndex(0)
+
+    def close_shell(self):
+        cur = self._current_panel()
+        if cur:
+            cur.close_shell()
+            self._update_tab_status_by_panel(cur, "disconnected")
+
+    def _set_status(self, text: str, color: str = "#888"):
+        cur = self._current_panel()
+        if cur:
+            cur._set_status(text, color)
+
+    @property
+    def current_host_id(self) -> str:
+        cur = self._current_panel()
+        return self._host_id_for_panel(cur) if cur else ""
+
+    def _find_host_id_by_conn(self, conn: SSHConnection) -> str:
+        for h in self.manager.list_hosts():
+            c = self.manager.get_connection(h.get("id"))
+            if c is conn:
+                return h.get("id")
+        return ""
+
+    def _update_tab_status(self, idx: int, state: str):
+        """更新标签标题：⚪未连接 / 🟢已连接 / 🔴已断开"""
+        title = self.tabs.tabText(idx)
+        # 去掉已有状态点
+        for prefix in ("⚪ ", "🟢 ", "🔴 ", "🟡 "):
+            if title.startswith(prefix):
+                title = title[len(prefix):]
+                break
+        if state == "connected":
+            new_title = f"🟢 {title}"
+        elif state == "disconnected":
+            new_title = f"🔴 {title}"
+        elif state == "error":
+            new_title = f"🟡 {title}"
+        else:
+            new_title = f"⚪ {title}"
+        self.tabs.setTabText(idx, new_title)
+
+    def _update_tab_status_by_panel(self, panel: TerminalPanel, state: str):
+        for i in range(self.tabs.count()):
+            if self.tabs.widget(i) is panel:
+                self._update_tab_status(i, state)
+                return
+
+    def shutdown(self):
+        """主窗口关闭时：关闭所有标签的 shell"""
+        for i in range(self.tabs.count()):
+            w = self.tabs.widget(i)
+            if isinstance(w, TerminalPanel):
+                w.close_shell()