feat(ui): render the Radio directory tuner from a store

RadioTuner renders the band label, readouts, slider and needle from the
Radio store. RadioControls keeps the drag and its slot and publishes what
the tuner shows; the component lays out the tick tape against the dial's
measured width, drawing no ticks before it has one, and lays out the
snapped needle before it drops the drag class so the needle does not
animate from where the drag let go.

scripts/package-boundaries.json

@@ -26,6 +26,7 @@
       "src/ui/views/ContextView.vue",
       "src/ui/views/panels/RadioPanel.vue",
       "src/ui/views/panels/SdrCard.vue",
+      "src/ui/views/panels/RadioTuner.vue",
       "src/ui/views/panels/PhoneTabBar.vue",
       "src/ui/views/panels/CockpitBriefing.vue",
       "src/ui/views/panels/CockpitContext.vue",
@@ -37,6 +38,7 @@
       "src/ui/cockpitContextState.js",
       "src/ui/cockpitInstrumentState.js",
       "src/ui/cockpitRollingValue.js",
+      "src/ui/radioTunerModel.js",
       "src/ui/views/panels/MissionDetail.vue",
       "src/ui/views/panels/MissionRoster.vue",
       "src/ui/views/panels/AwarenessPanel.vue",