Adds fuzzy subsequence matching with quality ranking to the model
pickers, replacing the WebUI's exact-substring filter and giving the
TUI a search where it previously had none.
- New fuzzy scorer (ui-tui/src/lib/fuzzy.ts + an identical copy at
web/src/lib/fuzzy.ts, since the two are separate TS packages with no
shared module). Matches a query as an ordered subsequence (so `g4o`
matches `gpt-4o`), scores by quality (exact > prefix > word-boundary >
contiguous > scattered) and returns matched character positions for
highlighting. Multi-token AND semantics (`clad snnt` -> claude-sonnet).
15 vitest tests cover the algorithm.
- WebUI ModelPickerDialog: ranked fuzzy filter on providers + models;
matched characters in model rows are highlighted via <mark>.
- TUI modelPicker: type-to-filter on the provider and model stages with
live ranking. Backspace edits the filter, Ctrl+U clears it, Esc clears
a non-empty filter before navigating back. Persist-global / disconnect
shortcuts moved from g/d to Ctrl+G / Ctrl+D so letters feed the filter.
Closes#30849
7527e7aeac