When a Home Assistant or Google token refresh fails, the whole account fetch
aborts. Previously this raised, so the outer handler in caldav_router emitted
a single sync error WITH NO calendar_id. Clients that preserve cached events
per calendar (iOS) couldn't attribute it and wiped the affected calendars.
Now both get_ha_events and get_google_events catch the token failure and emit
one error per enabled calendar, each carrying its calendar_id — so every
client can pin the failure to a specific calendar and keep its cached data.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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