- new user_settings.surface_color (nullable, device-local default, not synced):
drives the web sidebar / top bar / surfaces; NULL derives from bg_color as
before. Added to schema, migration, GET/PUT, NULLABLE_OVERRIDES, DEFAULT_SYNC.
- web: surface colour row in the settings table; applyTheme derives the whole
surface family from it
- web: per-row sync icon now has real styling — ON shows the primary-tinted
glyph on a pill, OFF shows a slashed, muted glyph (was previously unstyled,
so synced/not-synced looked identical)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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