Readline-style shortcuts in the interactive filter input (closes #24)
The pty / pty i / pty interactive picker's filter input was append-
only — backspace + printable chars, no cursor, no word motion, no
kill-line. Editing longer queries was awkward compared to the shell
prompts people build muscle memory for.
Fixed at two layers:
1. applyTextKey (src/tui/widgets/form.ts) — the shared text-field
helper — gains ctrl+w (delete previous word) and ctrl+k (kill to
end of line). It already had backspace / delete / arrows / home
/ end / ctrl+a / ctrl+e / ctrl+u / alt+arrow and alt+b/f word
motion. So every consumer (interactive filter, form widget,
command palette, prompt bar) picks up the new shortcuts for free.
2. Interactive filter (src/tui/interactive.ts) — replaces the hand-
rolled append/slice key handling with a TextFieldState signal
routed through applyTextKey. The filter line renders via
renderFieldNodes so the cursor paints on top of the char under
it (inverse-video) without shoving neighbors sideways. Typing
resets the selection to 0 as before; pure cursor motion (home,
end, arrows) preserves the current selection.
Tests:
- widgets-form.test.ts: 8 new unit tests for ctrl+a, ctrl+e, ctrl+w
(end-of-line, mid-string, trailing-whitespace boundary, empty
field) and ctrl+k (mid-cursor, at-end).
- tui.test.ts: 2 new end-to-end tests through a real PTY confirming
ctrl+u clears the filter in one keystroke and ctrl+w removes the
trailing word, updating the rendered filter line.