Add location-aware automatic default bounding box

The OpenSky "Default bounding box" now follows where flying happens.
A new "Automatic" picker mode (the default) resolves the live-map area
from a location cascade — drone telemetry → phone GPS → browser
geolocation → the user's Region country → Europe — instead of a fixed
box. Manual presets and Custom coordinates still work.

- Web App: new shared countries.js dataset (all countries + bbox,
  offline point→country); the bbox picker gains all European countries
  and an Automatic option (client pref prefs.autoBbox); the Region
  setting expands from 6 locale entries to all countries; the live map
  resolves the cascade each poll and sends it as ?bbox=.
- API Server: the states endpoint accepts and validates a ?bbox=
  override (validBBox); the Web App BFF forwards the query; the hub
  relays new phoneLatitude/phoneLongitude telemetry to the Web App.
- Fly App: reports the phone's own GPS (geolocator) alongside
  telemetry, used as the "your location" fallback.
- API panel: the OpenSky bbox picker lists all European countries.

Builds verified across web, panel, both Go modules and the Fly App
APK. Region list, Automatic default and the cascade ?bbox= override
verified in the browser.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

API Server/panel/src/App.vue

@@ -190,15 +190,61 @@ const BBOX_GROUPS = [
     { value: "-56,-82,13,-34", label: "South America" },
     { value: "-48,110,-10,180", label: "Oceania" },
   ] },
-  { label: "Countries", options: [
-    { value: "49,14.1,54.9,24.2", label: "Poland" },
-    { value: "50.5,3.2,53.7,7.3", label: "Netherlands" },
-    { value: "47.2,5.8,55.1,15.1", label: "Germany" },
+  // European countries (mirrors Web App/web/src/countries.js — keep in sync).
+  { label: "European countries", options: [
+    { value: "39.6,19.3,42.7,21.1", label: "Albania" },
+    { value: "42.4,1.4,42.7,1.8", label: "Andorra" },
+    { value: "46.4,9.5,49.0,17.2", label: "Austria" },
+    { value: "51.2,23.2,56.2,32.8", label: "Belarus" },
+    { value: "49.5,2.5,51.5,6.4", label: "Belgium" },
+    { value: "42.6,15.7,45.3,19.6", label: "Bosnia and Herzegovina" },
+    { value: "41.2,22.4,44.2,28.6", label: "Bulgaria" },
+    { value: "42.4,13.5,46.6,19.4", label: "Croatia" },
+    { value: "34.6,32.3,35.7,34.6", label: "Cyprus" },
+    { value: "48.6,12.1,51.1,18.9", label: "Czechia" },
+    { value: "54.6,8.1,57.8,12.7", label: "Denmark" },
+    { value: "57.5,21.8,59.7,28.2", label: "Estonia" },
+    { value: "59.8,20.6,70.1,31.6", label: "Finland" },
     { value: "41.3,-5.2,51.1,9.6", label: "France" },
-    { value: "49.9,-8.7,59,1.8", label: "United Kingdom" },
-    { value: "35.9,-9.6,43.8,3.4", label: "Spain" },
+    { value: "47.2,5.8,55.1,15.1", label: "Germany" },
+    { value: "34.8,19.4,41.8,28.3", label: "Greece" },
+    { value: "45.7,16.1,48.6,22.9", label: "Hungary" },
+    { value: "63.3,-24.6,66.6,-13.5", label: "Iceland" },
+    { value: "51.4,-10.6,55.4,-6.0", label: "Ireland" },
     { value: "36.6,6.6,47.1,18.6", label: "Italy" },
+    { value: "41.8,20.0,43.3,21.8", label: "Kosovo" },
+    { value: "55.7,20.9,58.1,28.2", label: "Latvia" },
+    { value: "47.0,9.4,47.3,9.6", label: "Liechtenstein" },
+    { value: "53.9,20.9,56.5,26.9", label: "Lithuania" },
+    { value: "49.4,5.7,50.2,6.5", label: "Luxembourg" },
+    { value: "35.8,14.1,36.1,14.6", label: "Malta" },
+    { value: "45.4,26.6,48.5,30.2", label: "Moldova" },
+    { value: "43.72,7.40,43.75,7.44", label: "Monaco" },
+    { value: "41.8,18.4,43.6,20.4", label: "Montenegro" },
+    { value: "50.7,3.3,53.7,7.2", label: "Netherlands" },
+    { value: "40.8,20.4,42.4,23.0", label: "North Macedonia" },
+    { value: "57.9,4.6,71.2,31.1", label: "Norway" },
+    { value: "49.0,14.1,54.9,24.2", label: "Poland" },
+    { value: "36.9,-9.5,42.2,-6.2", label: "Portugal" },
+    { value: "43.6,20.2,48.3,29.7", label: "Romania" },
+    { value: "41.2,19.6,81.9,180", label: "Russia" },
+    { value: "43.89,12.40,43.99,12.52", label: "San Marino" },
+    { value: "42.2,18.8,46.2,23.0", label: "Serbia" },
+    { value: "47.7,16.8,49.6,22.6", label: "Slovakia" },
+    { value: "45.4,13.4,46.9,16.6", label: "Slovenia" },
+    { value: "35.9,-9.4,43.8,3.4", label: "Spain" },
+    { value: "55.3,11.1,69.1,24.2", label: "Sweden" },
+    { value: "45.8,5.9,47.8,10.5", label: "Switzerland" },
+    { value: "35.8,25.7,42.3,44.8", label: "Turkey" },
+    { value: "44.4,22.1,52.4,40.2", label: "Ukraine" },
+    { value: "49.9,-8.7,60.9,1.8", label: "United Kingdom" },
+    { value: "41.900,12.445,41.908,12.458", label: "Vatican City" },
+  ] },
+  { label: "Other countries", options: [
     { value: "24,-125,49.5,-66.5", label: "United States" },
+    { value: "41.7,-141,83.1,-52.6", label: "Canada" },
+    { value: "-43.6,113.3,-10.7,153.6", label: "Australia" },
+    { value: "24,122.9,45.5,145.8", label: "Japan" },
   ] },
 ];
 const BBOX_FLAT = BBOX_GROUPS.flatMap((g) => g.options);