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* feat(frontend): add citation sources evidence panel Inline [citation:Title](URL) links render as badges, but with many citations the reader has no consolidated, deduplicated list of what a message or report actually drew on. Add a collapsible "sources" panel that extracts citation links from AI messages and markdown artifacts, dedupes by URL, counts occurrences, and offers per-source copy of a reusable markdown reference. - extractCitationSources: parse [citation:...](url) links, skip images and fenced code, dedupe by normalized URL, fall back to domain for generic labels - CitationSourcesPanel: collapsible list with per-source cite counts, internal scroll for long lists, and copy-to-clipboard reference button - Wire panel into AI message content and markdown artifact preview - Add en-US/zh-CN citation strings and types - Unit tests for extraction and panel rendering * fix(frontend): preserve default link styling in message content override MessageContent_ passes a custom `a` renderer to MarkdownContent, whose default `a` (primary underline + external target/rel) is overridden because MarkdownContent spreads props components last. Restore that styling/external behavior in the fallback branch so normal links in messages aren't regressed, while keeping citation: and /mnt/ handling. * fix(frontend): harden citation source extraction and dedupe link renderer Address review findings on the citation sources panel: - Use a non-consuming lookbehind so back-to-back citations no longer drop every other source. - Match balanced parenthetical groups in URLs so disambiguation links like .../Foo_(a)_(b) are no longer truncated. - Mask inline code (and unclosed streaming fences) so example citations in code aren't scraped as real sources; masking preserves indices. - Extract a shared createMarkdownLinkComponent factory used by both message content and markdown content, removing the duplicated `a` renderer.