[arenabuddy] Add automatic match sync from server on login and startup

[gazure]

This pull request implements automatic match synchronization from the server to the local database.

Key Changes:

• Post-login sync: After successful authentication, the app now automatically syncs matches from the server in the background
• Initial sync on startup: When the app launches with saved authentication, it performs an initial sync to fetch any new matches
• New sync module: Added backend/sync.rs with sync_matches() function that compares server and local match lists, downloading missing matches with proper token refresh handling
• Match filtering: Added filter to exclude matches with game_number ≤ 0 from the UI display
• Logging improvements: Changed missing match details from error to debug level, and added comprehensive sync logging

The sync process fetches the server's match list, compares against local matches by ID, and downloads any missing match data. Token refresh is handled automatically during sync operations.

[gazure]

• [arenabuddy] improve scraping of basic land arts #325
• [arenabuddy] add tmnt cards #324
• [arenabuddy] Update CLI documentation and fix MTGA database file extension #323
• [arenabuddy] Fix mulligan decision capitalization from lowercase to title case #322
• [arenabuddy] Convert UI theme from light to dark mode #321
• Remove generated Tailwind CSS file and add to gitignore #320
• Simplify CLAUDE.md development documentation #319
• [arenabuddy] Add automatic match sync from server on login and startup #318 👈 (View in Graphite)
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[gazure]

Merge activity

• Feb 28, 7:33 PM UTC: @gazure merged this pull request with Graphite.