feat(ui): render the language picker as a Vue component

LocalePicker renders the existing picker model with the same markup and
listbox behaviour; ProviderSettingsView shows it while the shell publishes
the active language and its choice handler to the gev-locale store. A host
passing localePicker: false publishes nothing. A choice reaches the shell
after the list is closed on screen, and every opening keeps the active
option in view.

scripts/package-boundaries.json

@@ -27,6 +27,8 @@
       "src/ui/views/panels/RadioPanel.vue",
       "src/ui/views/panels/SdrCard.vue",
       "src/ui/views/panels/RadioTuner.vue",
+      "src/ui/views/panels/LocalePicker.vue",
+      "src/ui/localePicker.js",
       "src/ui/views/panels/PhoneTabBar.vue",
       "src/ui/views/panels/CockpitBriefing.vue",
       "src/ui/views/panels/CockpitContext.vue",
@@ -72,6 +74,7 @@
       "src/ui/stores/radio.js",
       "src/ui/stores/context.js",
       "src/ui/stores/cockpit.js",
+      "src/ui/stores/locale.js",
       "src/ui/stores/location.js",
       "src/ui/stores/streetLevel.js",
       "src/ui/rail/RailChips.vue",
@@ -998,6 +1001,7 @@
       "src/ui/stores/radio.js",
       "src/ui/stores/context.js",
       "src/ui/stores/cockpit.js",
+      "src/ui/stores/locale.js",
       "src/ui/stores/location.js",
       "src/ui/stores/display.js"
     ],
@@ -2975,6 +2979,7 @@
       "src/ui/stores/radio.js",
       "src/ui/stores/context.js",
       "src/ui/stores/cockpit.js",
+      "src/ui/stores/locale.js",
       "src/ui/stores/location.js",
       "src/ui/stores/display.js"
     ],