feat(theme): DeepSeek blue themes and a Grok-style /theme picker

[Blackman99]

What

This is the first batch of the Grok CLI UX alignment. ADR-0002 makes Grok CLI the primary reference for the TUI: Grok wins ties, and Claude Code decides only where Grok has no equivalent. This batch paints the TUI in DeepSeek's brand blue #4D6BFE and adds a Grok-style /theme picker.

• Themes (packages/bundle/src/palette.ts):
  • Each theme is a set of Grok-style RGB slots, with explicit 256- and 16-colour overrides. For example, the navy band keeps its hue at index 17, where quantization alone would turn it gray.
  • The catalog is auto (the default, follows OSC 11), deepseek, deepseek-light and terminal. terminal uses ANSI colours only and paints no bands; the person's message is bold instead.
• Colours:
  • #4D6BFE: input frame, the person's rule, selection markers, ✻, the whale's water, the cursor.
  • Its tint #7E96F5: thinking rule, $skill, headings, links, paths.
  • The person's band is navy instead of plum.
  • Red, green, amber and the syntax colours are unchanged.
• Theme switching: the Theme record switches in place, so every role a renderer already holds paints the new palette.
• /theme:
  • With no argument it opens a picker: arrows preview live, Enter saves, Esc reverts.
  • /theme <name> sets a theme directly, and aliases like dark, light, system and native work.
  • The choice is kept under theme in code-cli-ui.json. That file now merges instead of being overwritten, so the /ui density survives.
  • CODSH_THEME overrides the saved choice for one launch.
• Screen:
  • Hover, sticky and divider fills come from the shared theme, and NO_COLOR now paints no fills.
  • OSC 12 sets the cursor colour, and OSC 112 restores it on exit.
• Repaint:
  • After a theme change, the session is replayed into a fresh transcript to recolour the history.
  • The repaint waits while a turn runs or a Child view is open.
  • Prompt.select gained a settled hook, so Esc reverts before the closing frame is drawn.

Known trade-offs

These are documented in CONTEXT.md and the alignment matrix.

• At 16 colours the brand and the tint both become 94; the terminal theme covers that case.
• Like --resume, a repaint does not re-show rows that never reached the session log: command reports, ! output and notices.
• Old tmux and Terminal.app ignore OSC 12.

Docs

• New ADR-0002, and ADR-0001 is marked superseded for the TUI.
• docs/alignment.md: the /theme row is now aligned with its test anchors, and a new "Grok CLI alignment" section lists the later batches.
• CONTEXT.md defines Theme and Repaint.
• README.md and README.zh.md are updated in parity.
• The logo, favicon and README banner use #4D6BFE, and the site frames were recaptured from the real build.
• The changeset bumps both packages as minor.

Tests

• pnpm run typecheck passes.
• pnpm test: 1988 pass. New specs cover the theme catalog, theme-setting, prefs, theme-picker and the select settle order, plus screen theme-driven fills and OSC 12/112, banner depth, light and terminal variants, and the terminal-theme prompt.
• pnpm run test:e2e: 179 pass, 1 skipped (the site capture, which runs only when asked).
  • The new e2e/pty-theme.e2e.ts switches to /theme deepseek-light: the history repaints and no dark band is left. The theme persists across a restart and the density survives. /theme terminal paints a 34 frame and sends OSC 112. The picker previews a theme and Esc reverts it without saving.
  • The harness now strips the runner's COLORTERM and CODSH_THEME, because the accent now depends on colour depth.

[changeset-bot]

🦋 Changeset detected

Latest commit: 11d95ee

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
codsh-cli	Minor
codsh-bundle	Minor

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