feat(kit): render the chips with UiChip and UiButton

UiChip is a non-interactive label chip and renders the voice
card's chips. The pressable chips and pills are pressed toggles, so the
rail card chips, map source chips and city and place pills render through
UiButton with pressedClass, keeping their classes, attributes and the
classes other code adds. The pills now report aria-pressed.

CHANGELOG.md

@@ -65,7 +65,10 @@
   what the answering action returned. The Display, Radio, RTL-SDR, Cockpit,
   mission replay and style parameter sliders are the kit's `UiSlider`, a
   native range input that emits numbers, and the pressed toggles are the
-  kit's `UiButton`, which gains `pressedClass`. `syncScopeControls`
+  kit's `UiButton`, which gains `pressedClass`; so are the rail card
+  chips, map source chips and location pills (which now report
+  `aria-pressed`), and the voice card's chips
+  are the kit's new `UiChip`. `syncScopeControls`
   (`./ui/display`) and `shouldHideCollapsedRightPanels` (`./ui/layout`) are
   deprecated: the Display view and the rail now own what they did. `./ui/input` imports Vue
   (samehkhamis).