993d5d83e1
Three Android UX fixes reported from on-device testing: 1. A calendar shared with the user now shows read-only affordances: parse the server's new read_only flag on events, show a lock icon in the filter sheet, and exclude read-only shared calendars from the event editor's calendar picker (getWritableCalendars) so saves no longer 403. The calendar's display name (owner's name) comes from the server. 2. (server-side) group event name prefix removed — no client change needed. 3. Move the personal/group view switcher out of the crowded top bar into the burger MenuSheet as a "group view" section (personal + each group with a check mark), mirroring iOS. The GroupSwitcher pill and its top-bar wiring are gone; the active-group banner stays. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>