feat: dashboard theme system with live switching#10687
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Add a theme engine for the web dashboard that mirrors the CLI skin engine philosophy — pure data, no code changes needed for new themes. Frontend: - ThemeProvider context that loads active theme from backend on mount and applies CSS variable overrides to document.documentElement - ThemeSwitcher dropdown component in the header (next to language switcher) with instant preview on click - 6 built-in themes: Hermes Teal (default), Midnight, Ember, Mono, Cyberpunk, Rosé — each defines all 21 color tokens + overlay settings - Theme types, presets, and context in web/src/themes/ Backend: - GET /api/dashboard/themes — returns available themes + active name - PUT /api/dashboard/theme — persists selection to config.yaml - User custom themes discoverable from ~/.hermes/dashboard-themes/*.yaml - Theme list endpoint added to public API paths (no auth needed) Config: - dashboard.theme key in DEFAULT_CONFIG (default: 'default') - Schema override for select dropdown in config page - Category merged into 'display' tab in config UI i18n: theme switcher strings added for en + zh.
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Summary
Adds a theme engine for the web dashboard — 6 built-in themes with live switching via a header dropdown. Theme selection persists to
config.yaml(dashboard.theme).How it works
document.documentElement— no page reload neededconfig.yamlviaPUT /api/dashboard/theme— survives server restartsGET /api/dashboard/themesreturns the saved theme + available listBuilt-in themes
Custom themes
Users can create
~/.hermes/dashboard-themes/<name>.yamlfiles. The backend discovers them and includes them in the theme list alongside built-ins.Architecture
Mirrors the CLI skin engine philosophy — themes are pure data (CSS variable overrides + overlay settings), no code changes needed to add new ones.
Frontend (
web/src/themes/):types.ts—DashboardTheme,ThemeColors,ThemeOverlaytypespresets.ts— 6 built-in theme objects (21 color tokens + overlay each)context.tsx—ThemeProvider+useTheme()hookThemeSwitcher.tsx— dropdown componentBackend (
hermes_cli/web_server.py):GET /api/dashboard/themes— theme list + active (public, no auth)PUT /api/dashboard/theme— persist selectionConfig (
hermes_cli/config.py):dashboard.themeinDEFAULT_CONFIG, merged into display tab in config UIi18n
Theme switcher strings added for English + Chinese.
Test plan
npx tsc -b— cleannpm run build— clean (394KB JS, 47KB CSS)pytest tests/hermes_cli/test_web_server.py— 76/76 passedpytest tests/hermes_cli/test_config.py— 49/49 passed