Fix: Allow role assignment to project creator

Remove default Owner/Member roles - empty role list on project creation, creator gets admin via created_by check

fix: multi-tab sync, online status, and streak persistence

fix: Proper AbortError handling with automatic retry

fix: Explicit signal undefined in custom fetch

fix: Remove sync from constructor - sync only via React lifecycle

fix: Completely bypass AbortController - permanent fix for data loading

fix: Add sync mutex to prevent concurrent sync calls and retry loops

fix: Add sync retry mechanism for AbortError - projects will reload after abort

fix: Add global AbortError handler to suppress console errors

fix: Comprehensive AbortError handling in fetch and auth listener

fix: Better AbortError handling and realtime reconnection logic

fix: Supabase session persistence and AbortError issues

Chore: Remove debug logging from Realtime subscription

Debug: Add comprehensive logging to Realtime subscription