The dashboard font is now selectable from the UI, not just YAML. A new Font
section in the header theme picker overrides the UI font of whatever theme is
active; the choice is orthogonal to the theme and survives theme switches.
Each theme keeps its own font as the default — picking "Theme default" clears
the override.
- web/src/themes/fonts.ts: curated font catalog (system + Google Fonts across
sans/serif/mono), each with a family stack and optional webfont URL. The
catalog is the only injected-font surface — no free-text URL box, so the
injected <link> origins stay fixed.
- web/src/themes/context.tsx: font-override state (localStorage + server),
applied after theme typography so it wins; theme apply re-asserts it, and
clearing re-runs theme apply to restore the theme's own font. Mono is left
to the theme so code/terminal are untouched.
- web/src/components/ThemeSwitcher.tsx: Font section with grouped, self-
previewing font rows and a "Theme default" clear option.
- hermes_cli/web_server.py: GET/PUT /api/dashboard/font persisting to
config.yaml dashboard.font, with a server-side id allow-list (unknown ids
coerce to the theme sentinel).
- i18n + types, api client methods, tests, and docs.
Validation: 6 new backend endpoint tests pass; tsc + vite build clean; live
browser test confirmed pick/persist/survive-theme-switch/clear all work.
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