Release v0.4.2-alpha

Fixed

• Cold-start screenshot detection race — Complete rewrite of ScreenshotContentObserver to handle MediaStore cold-start indexing delay on fresh app process:
  • Extended URI-based retry window from 1.5s to ~10.3s with exponential backoff (200ms → 2s × 3) so MediaStore has time to populate DISPLAY_NAME and RELATIVE_PATH columns on first launch
  • Added IS_PENDING column check — skips rows that MediaStore has not finished writing, returning false for retry instead of giving up
  • Added blank column detection — returns false for retry when displayName or relativePath are empty (the root cause: old code returned true and marked the URI as processed before columns were populated)
  • Added performInitialScan() — scans the last 30 seconds of MediaStore immediately after observer registration to catch screenshots taken during the app startup window
  • Added scanLatestScreenshots() fallback — scans the last 60 seconds of MediaStore when URI-based retries are exhausted (handles edge cases where onChange fires before MediaStore creates the row at all)
  • Null/parse-error onChange URI now falls back to scanning recent images instead of silently dropping the event
  • handleNewScreenshot converted from fire-and-forget coroutine to suspend function so callers wait for DB insert + notification before marking the URI as processed
  • Dedup set capped at 200 entries with oldest-25% eviction to prevent unbounded memory growth

Changed

• ScreenshotDetector.startDetector() now calls performInitialScan() on the observer right after registration