Generalise the two-tier SettingsSync into a server-driven flag map: each
syncable key has an account-wide flag (fetched from the server); pull applies
only on-flagged keys, push (read-modify-write) sends only on-flagged keys plus
the flag map. Per-row link icon toggles a setting's sync; a global switch flips
all. Enabling a flag adopts this device's current value as the shared one.
- AppSettings: fix bg_color mapping (was background_color), add cache_months,
month_view_paged, sync_flags
- SettingsView: uniform rows (sync icon | name | value), ContrastSelector and
the button pickers replaced by menu dropdowns, every colour gets a reset to a
canonical default, global "sync all" toggle; account settings (privacy,
group calendar, hide profile) kept in their own block; language and text/line
contrast kept device-local (iOS-specific)
- unify default line colour to #3A3A52 across views
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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