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Vasanth T efe48ade0c feat(tui): syntax-highlighted code, word-level diffs, reduced-motion gate (#289) 
* feat(tui): syntax-highlighted code, word-level diffs, and a reduced-motion gate

The remaining three items from the reference-TUI comparison, focused on
"real content rendering" + motion accessibility.

1. Syntax-highlight fenced code blocks. renderMarkdownCodeBlock passed code
   through plain; now the fence language is captured and the block is tokenized
   with chroma (new dep, pure Go) and colored with Zero's OWN audited palette —
   keyword=accent, string=green, number=amber, comment=faint, function=blue,
   punctuation=muted — so it stays on-brand and degrades through the same
   lipgloss profile path (truecolor→256→16→plain). Wrapping is token-level so a
   color never splits across a wrap. Unknown/missing language falls back to the
   old plain rendering, so it is never worse than today.

2. Word-level diff highlighting. diffCardBody tinted whole add/del lines; now an
   isolated 1:1 replacement (one "-" followed by one "+") highlights only the
   changed span on each side via a brighter changed-span bg (new addBgWord/
   delBgWord tokens), after trimming the common prefix/suffix. Gated to <=60%
   change so a near-rewrite is not confettied, and block changes keep whole-line
   tint. Changed-span colors validated by WCAG ratio (fg >=4.6:1, clear
   separation from the base band).

3. One reduced-motion gate. ZERO_REDUCED_MOTION (and no-TTY) now swaps the
   animated spinner for a steady dot via m.spinnerGlyph() at every render site
   (working line, plan, tool/specialist cards) and forces the fade off — one
   switch for all motion, where ZERO_NO_FADE only governed the fade. Liveness is
   preserved by the advancing elapsed timer, so a static frame never reads as
   frozen.

Tests cover the reduced-motion resolver + static glyph, changedSpan/word-diff
pairing + the near-rewrite fallback, and the highlighter's unknown-language
fallback + wrapping. Full internal/tui suite green; gofmt/vet/build clean.

* fix(tui): address render-polish review — highlight committed rows only

Adversarial review found a real interactive-jank regression and three smaller
issues; all fixed:

- PERF (blocker): the live streaming block re-tokenised the whole accumulated
  code via chroma on every frame. renderAssistantMarkdownText now takes
  allowHighlight; the interim/streaming path (model.interimBlock) and reasoning
  bodies pass false (plain, cheap), and only committed/cached rows
  (renderAssistantRow, selectable rows) highlight — so chroma runs once per row,
  never per frame.
- PERF: cache language->lexer lookups (including nil) and short-circuit an empty
  language before chroma's slow registry Match scan.
- Fences with metadata: take the first whitespace token as the language
  ("```go title=x" -> "go") instead of the whole info string.
- Reduced motion: freeze the compact and doctor braille rings too (their frame
  counters no longer advance under ZERO_REDUCED_MOTION), honoring the one-switch
  contract.

Tests: streaming code renders verbatim/plain; diff word-span colors AA on both
themes. Full internal/tui suite green; gofmt/vet/build clean.

* test(tui): opt the doctor/compact animation tests into motion

The reduced-motion gate auto-enables under no-TTY (colorprofile.NoTTY ->
reducedMotion), which is exactly the CI environment. That froze the compact and
doctor status rings, so two existing tests asserting "animates on tick" failed on
the Linux/macOS runners (Windows CI detects a color profile, so it passed there —
the platform split). Both tests exercise the animation mechanism, which is only
active when motion is on, so set m.reducedMotion = false in their setup to test it
deterministically regardless of the runner's detected profile.
2026-06-21 18:21:31 +05:30

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