chore: sync fork with upstream t3code (28 commits)

[roughcoder]

Syncs the Phoenix fork with pingdotgg/t3code through 63e6faef6, covering the 28 upstream commits landed since our fork point (e5c82d79a, 2026-08-10).

Merge rather than rebase, so our five Phoenix commits keep their identity across future syncs.

What's coming in

Features

• Open VSX theme search (feat(web): add Open VSX theme search pingdotgg/t3code#5654)
• OKLCH theme palettes (feat(web): use OKLCH for theme palettes pingdotgg/t3code#6036)
• Compact sidebar footer actions (feat(web): compact sidebar footer actions pingdotgg/t3code#6210), sidebar back buttons for PR/usage pages (feat(web): add back buttons for the pull requests and usage pages in the sidebar footer pingdotgg/t3code#6031)
• Copy Thread ID in sidebar + chat header context menus (feat(web): add Copy Thread ID to the sidebar and chat header thread context menu pingdotgg/t3code#5574)
• Shift+click to create a thread in the current project (feat: add ability to create a new thread in the current project with shift+click and show shortcut in tooltip pingdotgg/t3code#5994)
• Theme-aware environment artwork (feat(web): make environment artwork theme aware pingdotgg/t3code#6183)
• Hourly past-24-hour usage view (Add hourly past-24-hour usage view pingdotgg/t3code#6170)
• Mobile thread title regeneration (feat(mobile): add thread title regeneration pingdotgg/t3code#6253)

Fixes — Azure DevOps SSH remotes (pingdotgg#6187), self-hosted GitLab PR routing (pingdotgg#6061), unborn HEAD in VCS status (pingdotgg#5944), Windows 256-colour TERM (pingdotgg#5693), bare Windows drive roots (pingdotgg#6189), OpenCode model parsing with slashes (pingdotgg#5072), plus assorted web/mobile UI fixes.

Conflict resolution — one file, needs a reviewer's eye

apps/web/src/components/settings/ThemeEditorPanel.tsx was the only conflict.

Upstream pingdotgg#6183 makes environment artwork theme aware and removes the per-theme opt-in toggle entirely. Our rebrand had only relabelled that toggle's copy to "Show Phoenix environment artwork" — we never owned the feature; it predates the fork.

Resolved in favour of upstream, because the sidebarArtwork state the toggle referenced is deleted, so keeping our side would not compile. The themePalette.ts data model upstream retains is untouched.

Visible product change: the sidebar artwork toggle disappears from the theme editor. That is upstream's intended UX, not a regression, but it is the one thing here worth deliberately agreeing to.

Verification

• pnpm typecheck — no errors (suggestion-level diagnostics only)
• pnpm test — 2381 passed, 7 skipped, 230 files
• pnpm lint — one pre-existing upstream warning (apps/server/src/ws.ts:460, unused serverCommandId), not introduced here

Phoenix branding survives intact; the artwork label above is the only Phoenix string removed anywhere in the diff.

Follow-up, not in this PR

Upstream's new docs (docs/user/usage.md, docs/user/thread-sidebar.md) refer to "T3 Code" in user-facing prose and will need the rebrand treatment.

🤖 Generated with Claude Code

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