feat(desktop): Redesign theme experience with official packs / 主题体验改造与官方主题 (#6614)

* feat(desktop): Add Theme Pack V1 engine with theme library / 新增 Theme Pack V1 引擎与主题库

Controlled, non-executable desktop skins: semantic color tokens, density and
corner recipes, and an optional local background image with focus and safe
area. Includes manifest validation, atomic import with replace confirmation,
content-addressed asset serving, live preview with cancel restore, density
consumers, transparent layout under backgrounds, contrast warnings, and
safe-mode fallback to Graphite. / 受控不可执行的桌面皮肤：语义色令牌、密度
与圆角配方、可选本地背景图（焦点与安全区）。包含清单校验、原子导入与覆盖
确认、内容寻址资源服务、可取消的实时预览、密度消费者、背景下布局透明化、
对比度警告与安全模式回退 Graphite。

* feat(desktop): Redesign theme experience with official packs / 主题体验改造与官方主题

Problem:
Appearance settings exposed two competing base-style pickers and applied
theme packs immediately on card click, while activeThemeId could store base
style ids. Official skins and a gallery/overview IA were still missing.

Root cause:
Theme Pack V1 layered packs on top of desktop.theme_style without a unified
state model or select-then-apply UX, so base styles, official themes, and
user packs competed for the same controls.

Fix:
- Bump desktop-theme-state to schema v2: activeThemeId is official/user only;
  migrate legacy base-style active ids into desktop.theme_style.
- Add GetThemeExperience, ActivateBaseStyle, DisableThemePack, and
  RestoreGraphiteAppearance; reject base ids in ActivateThemePack.
- Embed eight official themes with fixed order, asset routing, and budgets.
- Ship AppearanceOverview + ThemeGallery (select ≠ apply, temp preview,
  immersive detail) driven by themeExperience.ts.
- Document the IA and provenance; keep procedural art as placeholders.

Verification:
- cd desktop && go test ./...
- cd desktop/frontend && pnpm typecheck && pnpm test:all && pnpm build
- wails generate module (bindings match, no drift)

* feat(desktop): complete the theme gallery and editor experience

Problem:
The theme gallery still had fragmented preview actions, placeholder flagship art, generic base-style previews, and a minimal custom-theme dialog that could not tune semantic colors or independent scenes.

Root cause:
Theme Pack V1 modeled one background and the gallery treated selection, preview, and persistence as separate interactions without a shared localized editor state.

Fix:
Upgrade the pack contract compatibly to V2 with independent home and workspace scenes, rebuild the gallery around immediate reversible preview and explicit apply, add localized semantic color and scene controls, replace the eight official artworks, and align base-style previews and actions with the settings UI.

Verification:
- cd desktop && go test ./...
- cd desktop/frontend && pnpm test:all
- cd desktop/frontend && pnpm typecheck
- cd desktop/frontend && pnpm check:css
- cd desktop/frontend && pnpm build
- Browser-verified Chinese and English labels, live preview, scene switching, and cancel restoration

* fix(desktop): satisfy the full-module formatting gate

Problem:
The desktop CI job stopped before tests because its repository-wide gofmt check reported main.go and theme_assets.go.

Root cause:
The earlier theme integration left one struct field with manual alignment and one extra trailing blank line; package tests compile these files but do not enforce gofmt byte formatting.

Fix:
Run gofmt on both reported files without changing runtime behavior.

Verification:
- cd desktop && gofmt -l .
- cd desktop && go test ./...

* fix(desktop): clarify theme scene content placement

Problem:
The scene editor exposed a vague content-safe-area label without explaining that it controls foreground text and card placement. The desktop CI lint gate also found four empty or unused Theme Pack leftovers.

Root cause:
The persisted safeArea field was surfaced directly as user-facing copy, while placeholder branches and helpers remained after the Theme Pack integration.

Fix:
Rename the control to Interface content area, add localized guidance and radio semantics, and remove or complete the four lint findings without changing theme behavior.

Verification:
- cd desktop && go test ./...
- cd desktop && go vet ./...
- cd desktop/frontend && pnpm typecheck
- cd desktop/frontend && pnpm check:css
- cd desktop/frontend && pnpm test:all
- cd desktop/frontend && pnpm build
- Theme Pack contract: 195 passed
- Verified the localized control in the running browser UI

* fix(desktop): unify theme confirmation dialogs

Problem:
Theme deletion, replacement imports, and export-rights checks used window.confirm, which surfaced platform-native dialogs that did not match the Reasonix settings UI.

Root cause:
The Theme Pack flows lacked a reusable in-app confirmation primitive, so both the gallery and legacy library called the browser API directly.

Fix:
Add an accessible portal-based Reasonix confirmation dialog with danger styling, safe focus behavior, Escape and backdrop cancellation, and focus restoration. Migrate all six theme confirmation call sites and localize their titles and actions.

Verification:
- pnpm typecheck
- pnpm check:css
- pnpm test:all
- pnpm build
- Browser: delete confirmation stayed in-app, Cancel received focus, Escape restored focus, and the temporary theme was deleted without a native dialog

* fix(desktop): restore theme preview and custom fonts

Problem:
- Custom UI and monospace fonts could no longer be configured from the redesigned appearance page.
- Selecting a user theme updated details without starting the advertised global preview.

Root cause:
- AppearanceOverview discarded both custom font name callbacks and omitted their editors.
- ThemeGallery limited non-immersive previews to the catalog tab.

Fix:
- Restore localized custom font editors and their persistence callbacks.
- Preview every non-immersive theme selection, including user packs.
- Add focused source-contract coverage for both behaviors.

Verification:
- pnpm test:all
- pnpm build
- pnpm check:css
- Browser verification of custom font variables, user-pack preview, and Back restoration

.gitignore

@@ -62,3 +62,7 @@ benchmarks/context-maintenance-e2e/run/
 
 # Local scratch
 temp/
+
+# Official theme art intermediate outputs / caches
+scripts/official-theme-art/out/
+scripts/official-theme-art/__pycache__/