feat: fzf when adding widgets

[1Git2Clone]

Summary

• Widget picker now uses fuzzy (subsequence) matching as a fallback when the query has no exact substring match — characters must appear in order but need not be adjacent
• Selection resets to the top-ranked result on every keystroke instead of staying pinned to the previously-selected widget type
• Matched characters are highlighted in the picker list: yellow-bold for unselected rows, green-bold for the selected row

Changes

File	Change
src/utils/widgets.ts	Add computeFuzzyScore() with span/consecutive/boundary scoring; add fuzzy tiers to filterWidgetCatalog() fallback; export getMatchSegments() for highlight rendering
src/tui/components/items-editor/input-handlers.ts	Reset selectedType to null on every typing/backspace keystroke so normalizePickerState always selects the best match
src/tui/components/ItemsEditor.tsx	Import getMatchSegments and render highlighted segments in both the top-level search and widget-level picker lists
src/utils/__tests__/widgets.test.ts	10 new tests covering fuzzy ranking, no-match, exact-beats-fuzzy, and all getMatchSegments cases
src/tui/components/items-editor/__tests__/input-handlers.test.ts	2 new tests verifying selection resets to best match on typing in both category and widget search levels

Design decisions

• Exact substring matches (scores 0–4) always outrank fuzzy matches — fuzzy tiers start at 1000/2000/3000 with enough headroom that no fuzzy quality score bleeds into the next tier
• Fuzzy scoring uses a greedy leftmost subsequence find, penalised by span and start position, rewarded for consecutive runs (+5 each) and word boundary hits (+3 each, treating
  spaces, -, and _ as boundaries)
• getMatchSegments mirrors the same exact-then-fuzzy priority so highlighted characters always agree with why an entry was ranked where it was

Test plan

• All tests pass (bun test)
• Type check and lint clean (bun run lint)
• Manual test: searching gb in the picker surfaces Git Branch as the top fuzzy match with G and B highlighted
• Manual test: searching vim with an existing Version widget selected jumps the cursor to Vim Mode, not Version

[sirmalloc]

Thanks for this, will publish soon when the next release is ready.