feat: 新增收藏功能与多项体验优化

- 新增本地收藏store与工具函数，支持文章/瞬间收藏持久化
- 重构插件可用性检查hook，统一管理依赖插件状态
- 替换旧数据加载hook为新的状态管理方案
- 优化首页布局与加载逻辑，调整公告组件样式
- 为瞬间详情页添加点赞、评论与收藏功能
- 新增文本处理工具，支持HTML/Markdown转纯文本与摘要截断
- 修复评论弹窗适配瞬间类型的参数问题

src/utils/favorite.ts

@@ -0,0 +1,104 @@
+/**
+ * 收藏快照:把文章(IPost)/瞬间(IMoment)组装为统一收藏项 IFavoriteItem
+ * 纯函数层,快照自包含(纯文本摘要截断),供 store 与三处收藏按钮共用
+ */
+import type { IMoment, IPost } from '@/api/types/halo'
+import { checkAvatarUrl, checkImageUrl } from '@/utils/url'
+import { extractPlainExcerpt } from '@/utils/text'
+
+/** 收藏内容类型 */
+export type FavoriteKind = 'post' | 'moment'
+
+/** 收藏项作者快照 */
+export interface IFavoriteOwner {
+  /** post: owner.metadata.name;moment: owner.name */
+  id?: string
+  displayName: string
+  avatar: string
+}
+
+/** 统一收藏项(文章/瞬间,纯本地) */
+export interface IFavoriteItem {
+  kind: FavoriteKind
+  /** 详情 id(metadata.name) */
+  id: string
+  /** 封面(仅文章) */
+  cover?: string
+  /** 标题(仅文章) */
+  title?: string
+  /** 纯文本摘要:文章 excerpt/正文抽 120 字;瞬间正文抽 200 字 */
+  content: string
+  /** 收藏时刻(ISO 字符串) */
+  createTime: string
+  owner: IFavoriteOwner
+}
+
+/** 文章正文/摘要截断字数 */
+const POST_EXCERPT_MAX = 120
+/** 瞬间正文截断字数 */
+const MOMENT_EXCERPT_MAX = 200
+
+/** 取文章摘要文本(excerpt 优先,兜底从正文抽取) */
+function getPostExcerptText(post: IPost): string {
+  return extractPlainExcerpt(post.spec.excerpt || post.content?.content || post.content?.raw, POST_EXCERPT_MAX)
+}
+
+/** 文章 → 收藏快照 */
+export function buildPostFavoriteItem(post: IPost, now: Date = new Date()): IFavoriteItem {
+  const owner = post.owner
+  const cover = post.spec.cover ? checkImageUrl(post.spec.cover) : undefined
+  return {
+    kind: 'post',
+    id: post.metadata.name,
+    cover,
+    title: post.spec.title,
+    content: getPostExcerptText(post),
+    createTime: now.toISOString(),
+    owner: {
+      id: owner.metadata?.name,
+      displayName: owner.displayName || '',
+      avatar: checkAvatarUrl(owner.avatar),
+    },
+  }
+}
+
+/** 瞬间 → 收藏快照(无封面/标题) */
+export function buildMomentFavoriteItem(moment: IMoment, now: Date = new Date()): IFavoriteItem {
+  const owner = moment.owner
+  // moment.owner 含 index signature,metadata 需显式收窄
+  const ownerMeta = owner?.metadata as { name?: string } | undefined
+  return {
+    kind: 'moment',
+    id: moment.metadata.name,
+    content: extractPlainExcerpt(moment.spec.content?.html || moment.spec.content?.raw, MOMENT_EXCERPT_MAX),
+    createTime: now.toISOString(),
+    owner: {
+      id: owner?.name || ownerMeta?.name,
+      displayName: owner?.displayName || '',
+      avatar: checkAvatarUrl(owner?.avatar),
+    },
+  }
+}
+
+/** 收藏唯一键(kind 与 id 拼接,两域 metadata.name 可能撞名) */
+export function favoriteKey(kind: FavoriteKind, id: string): string {
+  return `${kind}:${id}`
+}
+
+/**
+ * 持久化读回数据为真边界数据,入库/展示前校验结构
+ * 仅校验关键字段,非法项直接丢弃
+ */
+export function isValidFavoriteItem(item: unknown): item is IFavoriteItem {
+  if (!item || typeof item !== 'object')
+    return false
+  const target = item as Partial<IFavoriteItem>
+  const kindOk = target.kind === 'post' || target.kind === 'moment'
+  const idOk = typeof target.id === 'string' && target.id !== ''
+  const contentOk = typeof target.content === 'string'
+  const createTimeOk = typeof target.createTime === 'string'
+  const ownerOk = !!target.owner
+    && typeof target.owner === 'object'
+    && typeof (target.owner as IFavoriteOwner).displayName === 'string'
+  return kindOk && idOk && contentOk && createTimeOk && ownerOk
+}