Fix PWA: startup flash, Add Feed shortcut no-op, and Share Target 404

[Copilot]

• Fix startup flash: add critical inline CSS in index.html for #app-loading screen
• Fix "Add Feed" shortcut: FeedsPage reads ?action=add-feed and opens dialog
• Fix share target "page not found": change manifest to GET, handle params in FeedsPage
• Fix E2E: favorites.spec.ts - use exact-match regex (^Favorite$/^收藏$) so "Favorited" isn't matched; handle pre-favorited state by unfavoriting first; increase post-click timeout from 5s→10s
• Fix E2E: history.spec.ts - wait for .animate-spin to disappear (IndexedDB loads after networkidle); increase article visibility timeout 10s→15s
• Fix E2E: feedSubscription.spec.ts - wait directly for h1 matching Feeds|订阅源 instead of relying on networkidle + generic first h1; increase timeout 10s→15s
• All 245 unit tests pass

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[chiga0]

@copilot 修复自动化测试错误

[Copilot]

@copilot 修复自动化测试错误

Fixed in commit 29e31dd. Three E2E test issues addressed:

1. favorites.spec.ts (consistent failure): The regex /Favorite|收藏|favorite/ matched "Favorited" too, so if the article was already favorited from a prior sequential test run, the click would un-favorite it and the "Favorited" assertion would never be satisfied. Fixed by using exact-match anchors (/^Favorite$|^收藏$/ vs /^Favorited$|^已收藏$/), adding a pre-check to unfavorite first if needed, and increasing the post-click timeout from 5s to 10s.

2. history.spec.ts (flaky): waitForLoadState('networkidle') resolved before the IndexedDB-backed history finished rendering. Fixed by also waiting for the .animate-spin loading indicator to disappear, and increasing article visibility timeout from 10s to 15s.

3. feedSubscription.spec.ts (flaky): After clicking "Back to Feeds", asserting the generic first h1 after networkidle could race with the page transition. Fixed by waiting directly for h1 with text matching Feeds|订阅源 (timeout 15s), which is self-asserting.