- Remove overlay mining image toast; OSD card notifications no longer flash a frame screenshot
- Add Hide Kana toggle to frequency rank table to filter kana-only headwords
- Fix vocab exclusions to deduplicate and match token variants (e.g. ない / 無い) under one exclusion entry
- Skip cover image fetching when the overview tab is inactive
- Remove UTC-based UNION branch from getRollupGroupsForSessions; keep only localtime rollup
- Add resolveSentenceSearchLimit to clamp/sanitize infinity and negative limit values
- Switch onMiningImageEvent from queued to latest-value IPC listener (drop stale frames)
- Add regression tests for rollup key locality and sentence search limit edge cases