Convert filter_bar.js to TypeScript (issue #17)

- Add ts/filter_bar.ts: typed port of the filter bar. Criterion / PillEntry /
  RangeField / DeselectableRadio interfaces replace the loose objects and the
  radio.wasChecked custom property; var → const/let throughout
- Window entry points (applyFilterBar/clearFilterBar/toggleStringFilterInput/
  showPresetNameInput/savePreset) declared in ts/globals.d.ts; readSearchSelect
  now called as window.readSearchSelect
- Drop the dead selectValue helper; factor the repeated path→mode mapping into
  presetMode()
- Point the FilterBar component Media and every e2e/test reference at the
  compiled dist/filter_bar.js

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

common/components/filters.py

@@ -52,11 +52,11 @@ _FILTER_RADIO_CLASS = (
 _FILTER_GRID_CLASS = "grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4 mb-4"
 
 
-# range_slider.js wires RangeSlider; filter_bar.js wires the bar chrome
-# (Apply/Clear, presets, search injection). Widget media (search_select.js,
+# range_slider.js wires RangeSlider; ts/filter_bar.ts wires the bar chrome
+# (Apply/Clear, presets, search injection). Widget media (dist/search_select.js,
 # date_range_picker.js) bubbles up from the contained FilterSelect / picker.
 _RANGE_SLIDER_MEDIA = Media(js=("range_slider.js",))
-_FILTER_BAR_MEDIA = Media(js=("filter_bar.js",))
+_FILTER_BAR_MEDIA = Media(js=("dist/filter_bar.js",))
 
 
 def _filter_parse(filter_json: str) -> dict: