refactor(theme): Plan 2.5 P3 — dark mode class on <html> (AD-2.5-D1 + Fix 6)

Per RFC-WS-PRIMEVUE-PLAN-2-5 §4 AD-2.5-D1 and §5.6 Fix 6. Single class
on <html> drives both PrimeVue darkModeSelector and Tailwind v4
@custom-variant dark — one toggle, two ecosystems react.

Audit findings (pre-change):
- applyDomAttributes was writing BOTH data-theme="dark" AND .dark on
  documentElement. The historic data-theme write is the design-doc §4
  mechanism that AD-2.5-D1 supersedes; the .dark toggle was already
  correct (and is already paired with PrimeVue darkModeSelector: '.dark'
  in plugins/primevue/index.ts:31, verified in P1).
- tailwind.css had NO @custom-variant dark directive — Tailwind v4
  default is `prefers-color-scheme` (OS-controlled), so utility
  `dark:` variants would have ignored the topbar toggle entirely.
- One stray .dark subtree wrapper in AppTopbar.stories.ts:56
  (DarkTheme story) — deliberate Storybook isolation per its comment,
  but in violation of AD-2.5-D1's single-source-of-truth rule.

Changes:
- useShellUiStore.applyDomAttributes(): removed data-theme write,
  kept .dark class toggle on document.documentElement, kept
  data-density (P6 wires density-toggle UI; density is an
  orthogonal axis and unaffected). File-header comment updated to
  cite AD-2.5-D1 + reference the Tailwind & PrimeVue mirror sites.
- assets/styles/tailwind.css: added
  `@custom-variant dark (&:where(.dark, .dark *))` so utility
  `dark:` classes resolve via the same .dark trigger.
- components-v2/layout/AppTopbar.stories.ts: stripped class="dark"
  from the DarkTheme story's render wrapper. Story comment updated
  to flag that visual confirmation now comes via parity-batch
  Playwright (after Plan 2.5 closes), not Storybook autodocs. A
  proper documentElement-mutating decorator is a backlog item.
- stores/__tests__/useShellUiStore.spec.ts: updated the existing
  applyDomAttributes assertion to drop the data-theme expectation
  (the write is gone); added a new `describe('applyDomAttributes
  — dark mode (AD-2.5-D1)', …)` block with 2 specs (class toggle
  reactive, no data-theme attribute written).

Re-grep verification — all three return 0 hits:
- stray .dark in v2 (excluding `dark:` utility prefixes)
- data-theme setAttribute calls in stores/
- [data-theme=…] CSS selectors anywhere

Suite delta: 573 → 575 (+2). vue-tsc clean. Scoped ESLint clean.

Note: darkModeSelector: '.dark' was already set in
plugins/primevue/index.ts:31 (verified in P1 audit) — the config
dimension of AD-2.5-D1 was satisfied before this commit; P3 closes
the store-side, Tailwind-side, and stray-class dimensions.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
2026-05-20 09:31:30 +02:00
parent 41af180168
commit d0dd45c03a
4 changed files with 81 additions and 11 deletions

View File

@@ -13,6 +13,16 @@
@plugin "tailwindcss-primeui";
@source "../../**/*.{vue,ts,js,tsx,jsx}";
/* AD-2.5-D1 (RFC-WS-PRIMEVUE-PLAN-2-5 §4): align Tailwind v4's `dark:`
* variant to the same `.dark` class on <html> that PrimeVue's
* darkModeSelector and useShellUiStore.applyDomAttributes use. Without
* this, Tailwind v4 defaults to `prefers-color-scheme` (OS-controlled),
* and the explicit toggle in the topbar would update PrimeVue
* components but leave Tailwind utility classes (e.g. `dark:bg-*`,
* `dark:text-*`) responding only to the OS — half-broken dark mode.
*/
@custom-variant dark (&:where(.dark, .dark *));
/* AD-2.5-T1 — typography (RFC-WS-PRIMEVUE-PLAN-2-5).
*
* Inter is loaded via @fontsource/inter in main.ts (weights 400/500/600/700,