Add sidebar preview and reasoning slider gallery foundation

Merged
TE
19d ago
+758-34

Summary

Session sidebar rows can show the latest reply in an accessible hover/focus card when preview features are enabled. The card survives pointer handoff, supports Escape dismissal, and offers card, quiet, and outline variants in the existing component gallery and native Debug Settings.

The opt-in reasoning slider gains accent and minimal treatments in the gallery and Debug Settings. Existing base slider motion and interactive card semantics are preserved.

Testing

  • bun test test/session-sidebar-preview.test.tsx test/effort-picker-slider.test.tsx test/effort-track-labels.test.tsx: 26 passed, 0 failed, 95 assertions on 375ab4cafe253db10d84b83dbbe34ad3984d46b6.
  • bun run typecheck: passed all 1,502 files on the same head.
  • bun run gallery:build: passed, canonical gallery built in 2m 8s.
  • Changed Swift syntax: all 11 selected files passed. Native compilation, Swift test execution, and tagged-app dogfood remain unverified.
  • git diff --check: passed; seven non-merge commits against 3fff7c36bb00e710c51567aa79478087cc00b6aa.
  • Localization delta: zero new/changed macOS keys and zero changed web English keys. Strict catalog validation fails on 34,175 existing parity errors in untouched catalogs.

Changelog

Added: Preview-feature sidebar reply cards and Debug Settings treatments for sidebar previews and the opt-in reasoning slider.

Proof

The existing SessionSidebar and EffortPicker gallery entries expose the real controls and visual variants. Live visual review and native dogfood remain pending; this PR is a draft.

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Summary by cubic

Adds hover/focus preview cards to session sidebar rows and a visual variant for the opt-in reasoning slider, both controllable from native Debug Settings.

  • Session rows show the latest reply in a floating card on hover or keyboard focus when preview features are on, with card, quiet, and outline treatments; the card survives pointer handoff, dismisses on Escape, and does not change row geometry.
  • The reasoning slider keeps its current accent treatment by default and gains an opt-in minimal outlined treatment; a user's layout.sidebarPreviewVariant can still override the sidebar variant, and ?sidebarPreview= works for prototypes.