feat(chat): rich citation cards, excerpt rewrite, inline annotations, and A2UI rendering#4

Merged

sylvanding merged 8 commits intomainfrom

feat/rich-citation-rewrite

Mar 12, 2026

Commits on Mar 12, 2026

feat(chat): rich citation cards with metadata, loading stages, and stream throttling
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feat(chat): excerpt rewrite with SSE streaming, diff view, and style selector
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feat(chat): inline citation tags with hover preview and scroll-to-card linking
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feat(chat): A2UI rich media rendering and parallel multi-KB retrieval
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docs(plans): mark rich-citation-rewrite-a2ui plan as completed
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fix(frontend): resolve TypeScript compilation errors and VitePress dead link
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fix(frontend): resolve A2UI catalog type mismatch and remove unused ocrMutation
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fix(frontend): update tests for ChatInput multi-button and SettingsPage mock provider
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