feat(markdown): streamdown style ownership, code plugin, chip-parse perf

[rpvilo]

Takes full ownership of markdown styling and speeds up message text rendering.

• Drop streamdown/styles.css and the @source scans — all Streamdown element styling now lives in our [data-streamdown] rules in globals.css
• Add @streamdown/code plugin with shikiTheme={["github-light", "vesper"]} for syntax highlighting
• parseChipSegments: fast-path includes() bail before the regex scan — the streaming row was re-scanning its full accumulated text per token (O(n²) over a long answer)
• Message.Text: memoize the parse + segment tree on the text and renderers, so settled rows skip the work on unrelated re-renders
• Composer/code-block style tweaks riding along

Known gap: with the @source scan removed, Shiki's token-color utilities (text-[var(--sdm-c)] etc.) no longer compile — highlighting needs a follow-up (either restore the @source line or add explicit token styles).

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Project	Deployment	Actions	Updated (UTC)
intentface-chat	Ready	Preview, Comment	Jul 14, 2026 7:28pm