feat(app): add design system viewer, nostr feed, stop generation, and content refactor
- Design system browser with grid/detail views for tokens and components - Nostr feed tab with note/article/zap filtering and relay status - Stop generation button to abort AI streaming mid-response - Paste & extract content without sending to AI - Refactor useContentPanel into contentExtraction.ts and contentFiltering.ts - Banner fallback composable for 3-stage image loading - Wikipedia and Google Books as fallback image sources - Loading skeletons with variant-specific shapes - Mobile UX: auto-switch to content, back button, detail flow - Project grid with breadcrumb nav and inline creation - Filesystem Vite plugin for local project browsing - Magazine text cleanup and song grid polish Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Claude Opus 4.6
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