Merge upstream/main: cockpit emergency, GNSS integrity and GeoJSON import meet i18n

Upstream advanced past the KartaView merge: transponder-emergency HUD
wording (formatCockpitEmergency in cockpitMath), the GNSS integrity
layer joined the Events group, and a GeoJSON/KML/KMZ/GPX file-import
control landed - all in regions this branch localizes.

- cockpitMath: upstream's formatCockpitEmergency kept alongside the
  branch's formatter-injected Context scope (module stays i18n-free;
  squawk/ADS-B codes and the broadcast label are data).
- cockpitInstruments: the emergency HUD line composed with t()
  placeholders; fleet/feedState stay translated, the 'emergency' class
  toggle kept.
- layerPanel: upstream's gnss-integrity id with msg('Events').
- package-boundaries: both sides' entries unioned.
- New upstream UI strings marked and translated, as the branch's
  unmarked-string detector requires: the geo-import control's markup
  (data-i18n-title/-aria-label/text), its list titles, hints and
  summarize() lines (t/tn with placeholders), the aircraft emergency
  labels (msg data), and the GNSS legend blurb (t with placeholders).
- es/ru catalogs: 26 new keys each (2019 messages).

npm run i18n: complete, no unmarked strings. npm test: 6739/6741 (the
one failure is the pre-existing environmental OPENAI_API_KEY leak in
devFreshDotenv). Build passes.

scripts/package-boundaries.json

@@ -837,6 +837,7 @@
   "live-observations": {
     "exports": ["./sources/live"],
     "modules": [
+      "src/data/aircraftEmergency.js",
       "src/sources/live/aircraft.js",
       "src/sources/live/contract.js",
       "src/sources/live/index.js",
@@ -850,6 +851,7 @@
     "modules": [
       "src/cyberSonar.js",
       "src/data/aircraftClass.js",
+      "src/data/aircraftEmergency.js",
       "src/data/aircraftIcons.js",
       "src/data/aircraftMeta.js",
       "src/data/aircraftNearbyPolicy.js",
@@ -898,6 +900,7 @@
     "modules": [
       "src/cyberSonar.js",
       "src/data/aircraftClass.js",
+      "src/data/aircraftEmergency.js",
       "src/data/aircraftIcons.js",
       "src/data/aircraftMeta.js",
       "src/data/aircraftNearbyPolicy.js",
@@ -1635,6 +1638,7 @@
       "src/contextModePolicy.js",
       "src/creditKeyboard.js",
       "src/data/aircraftClass.js",
+      "src/data/aircraftEmergency.js",
       "src/data/aircraftIcons.js",
       "src/data/aircraftMeta.js",
       "src/data/aircraftNearbyPolicy.js",
@@ -2147,6 +2151,9 @@
       "src/data/inputOwnership.js",
       "src/annotations/drawMode.js",
       "src/annotations/drawTool.js",
+      "src/data/geoFileImport.js",
+      "src/ui/flyToDataSource.js",
+      "src/ui/geoFileImport.js",
       "src/data/routeSteps.js",
       "src/layers/directions/index.js",
       "src/layers/directions/source.js",
@@ -2170,6 +2177,10 @@
       "src/layers/perimeters/records.js",
       "src/layers/perimeters/cards.js",
       "src/layers/perimeters/inciweb.js",
+      "src/app/layers/gnss.js",
+      "src/layers/gnss/index.js",
+      "src/layers/gnss/source.js",
+      "src/layers/gnss/records.js",
       "src/layers/cctv/sourcePolicy.js",
       "src/sources/reference.js",
       "src/search/nominatim.js",
@@ -2366,7 +2377,10 @@
       "src/ui/unitLabels.js",
       "src/layers/recentImagery/display.js",
       "src/ui/keyGuidance.js",
-      "src/layers/installations/classLabel.js"
+      "src/layers/installations/classLabel.js",
+      "src/data/cameraFraming.js",
+      "src/data/geoImportPins.js",
+      "src/data/geoImportImages.js"
     ],
     "external": [
       "hls.js",
@@ -2433,6 +2447,7 @@
       "src/celestialRing.js",
       "src/cockpitMath.js",
       "src/data/aircraftClass.js",
+      "src/data/aircraftEmergency.js",
       "src/data/aircraftIcons.js",
       "src/data/aircraftMeta.js",
       "src/data/aircraftNearbyPolicy.js",
@@ -2770,6 +2785,10 @@
       "src/layers/perimeters/records.js",
       "src/layers/perimeters/cards.js",
       "src/layers/perimeters/inciweb.js",
+      "src/app/layers/gnss.js",
+      "src/layers/gnss/index.js",
+      "src/layers/gnss/source.js",
+      "src/layers/gnss/records.js",
       "src/layers/cctv/sourcePolicy.js",
       "src/search/nominatim.js",
       "src/nominatimGeocode.js",
@@ -2908,7 +2927,8 @@
       "src/i18n/locales/ru.json",
       "src/ui/unitLabels.js",
       "src/layers/recentImagery/display.js",
-      "src/layers/installations/classLabel.js"
+      "src/layers/installations/classLabel.js",
+      "src/data/cameraFraming.js"
     ],
     "external": [
       "hls.js",
@@ -2973,7 +2993,8 @@
       "src/sources/overpassFeatures.js",
       "src/sources/featureSource.js",
       "src/sources/capability.js",
-      "src/data/cameraArrival.js"
+      "src/data/cameraArrival.js",
+      "src/data/cameraFraming.js"
     ],
     "external": [
       "cesium",
@@ -3081,7 +3102,8 @@
       "src/layers/flights/recordPolicy.js",
       "src/data/aircraftMeta.js",
       "src/data/renderAltitude.js",
-      "src/data/aircraftClass.js"
+      "src/data/aircraftClass.js",
+      "src/data/aircraftEmergency.js"
     ],
     "external": []
   },
@@ -3100,7 +3122,8 @@
       "src/layers/military/recordPolicy.js",
       "src/data/aircraftMeta.js",
       "src/data/renderAltitude.js",
-      "src/data/aircraftClass.js"
+      "src/data/aircraftClass.js",
+      "src/data/aircraftEmergency.js"
     ],
     "external": []
   },
@@ -3306,7 +3329,8 @@
       "src/sources/httpBody.js",
       "src/layers/perimeters/source.js",
       "src/layers/perimeters/records.js",
-      "src/layers/submarineCables/bundledSource.js"
+      "src/layers/submarineCables/bundledSource.js",
+      "src/layers/gnss/source.js"
     ],
     "external": []
   },
@@ -3525,6 +3549,21 @@
     ],
     "external": ["cesium"]
   },
+  "gnss": {
+    "exports": ["./layers/gnss"],
+    "modules": [
+      "src/layers/gnss/index.js",
+      "src/sources/httpBody.js",
+      "src/layers/gnss/source.js",
+      "src/layers/gnss/records.js"
+    ],
+    "external": ["cesium"]
+  },
+  "gnss-source": {
+    "exports": ["./layers/gnss/source"],
+    "modules": ["src/sources/httpBody.js", "src/layers/gnss/source.js"],
+    "external": []
+  },
   "perimeters-source": {
     "exports": ["./layers/perimeters/source"],
     "modules": [
@@ -3652,6 +3691,7 @@
       "src/sources/featureGeometry.js",
       "src/sources/live/standalone.js",
       "src/sources/live/contract.js",
+      "src/data/aircraftEmergency.js",
       "src/sources/live/aircraft.js",
       "src/sources/live/vessels.js",
       "src/tools/places.js",