fix(bookmarks): wire up bookmark saving, sync, and list display

[Ejirowebfi]

closes #153

Fixes #153 — bookmarks were not persisting saved items.

What changed

src/store/bookmarkStore.ts (new)

• Zustand store with persist middleware writing to AsyncStorage key bookmarks
• addBookmark(item) — adds to store, syncs POST /api/bookmarks to server
• removeBookmark(itemId) — removes from store, syncs DELETE /api/bookmarks/:itemId
• isBookmarked(itemId) — selector
• Matches existing store patterns (notificationStore, settingsStore)

src/components/mobile/BookmarkButton.tsx (updated)

• Now owns the toggle logic — reads/writes directly to bookmarkStore
• Accepts item: BookmarkItem prop instead of stateless isBookmarked/onToggle
• Handles add/remove with server sync on press

src/components/mobile/BookmarkList.tsx (new)

• Reads bookmarks from store
• Renders saved items with title, type, and navigation link
• Shows empty state when no bookmarks exist

tests/components/Bookmark.test.tsx (new, 9 tests)

• Pressing BookmarkButton adds item to store + calls POST /api/bookmarks
• Pressing again removes it + calls DELETE /api/bookmarks/:id
• AsyncStorage.setItem called on bookmark add (persist middleware)
• BookmarkList renders items from store
• BookmarkList shows empty state when no bookmarks

Test results

9/9 new tests pass. Full suite: 247 tests passing, same 2 pre-existing failures unrelated to this PR.

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