Backend:
- v0.64 migration: monitored column on financial_accounts
- GET/PUT data-sources accounts endpoints for monitored toggle + tx listing
- matchSuggestionService: excludes unmonitored accounts from match scoring
Frontend:
- BankSyncSection rebuild: accounts panel with monitored switch, expand for
last 50 transactions, match status badges, optimistic toggle
- TransactionMatchingSection: toast on bills load failure
- DataPage: toast on import history load failure
- ProfilePage: toast on both login history fetch failures
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