Notrufnummern-Datenbasis, Ländererkennung, State-Management und Lokalisierung (AP1-AP7)

Implementiert den kompletten Kern-Flow der Emergency App gemäß docs/plan.md:
- Notrufnummern-Datenbasis für 199 Länder + Modelle/Repository (AP1)
- DialerService für tel:-Notrufe ohne Auto-Dial (AP2)
- Statisches UI mit Panik-Button-Fallback (AP3)
- Priorisierte Ländererkennung: SIM/Netz -> GPS/Geocoding -> Cache (AP4)
- EmergencyProvider verdrahtet Repository/LocationService mit der UI (AP5)
- Manuelle Länderauswahl als Fallback samt eigener Priorität (AP6)
- UI-Lokalisierung (de/en/fr/es), an erkanntes Land gekoppelt (AP7)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

lib/l10n/app_en.arb

@@ -1,3 +1,51 @@
 {
-  "@@locale": "en"
+  "@@locale": "en",
+  "appTitle": "Emergency",
+  "@appTitle": {
+    "description": "AppBar title of the home screen"
+  },
+  "selectCountryButton": "Select country manually",
+  "@selectCountryButton": {
+    "description": "Label of the button/tooltip used to open the manual country picker"
+  },
+  "retryButton": "Try again",
+  "@retryButton": {
+    "description": "Label of the button that retries country/number detection after an error"
+  },
+  "errorGeneric": "Unknown error while loading the emergency numbers.",
+  "@errorGeneric": {
+    "description": "Fallback error message shown when the provider does not report a specific error"
+  },
+  "countryUnknownMessage": "Country could not be determined.",
+  "@countryUnknownMessage": {
+    "description": "Shown when the country could not be detected automatically (and no location permission info is shown separately)"
+  },
+  "countryNotInDatabaseMessage": "Country not listed in the emergency number database. Only the global emergency number is available.",
+  "@countryNotInDatabaseMessage": {
+    "description": "Shown when the detected country has no entry in the emergency number database"
+  },
+  "pickerTitle": "Select country",
+  "@pickerTitle": {
+    "description": "AppBar title of the manual country picker screen"
+  },
+  "pickerSearchHint": "Search country",
+  "@pickerSearchHint": {
+    "description": "Hint text of the search field in the manual country picker screen"
+  },
+  "pickerNoResults": "No country found.",
+  "@pickerNoResults": {
+    "description": "Empty state shown when the search filter matches no country"
+  },
+  "emergencyButtonSemanticLabel": "{label}, call {number}",
+  "@emergencyButtonSemanticLabel": {
+    "description": "Semantics/tooltip label of an emergency button, combining the number's label and the number itself",
+    "placeholders": {
+      "label": {
+        "type": "String"
+      },
+      "number": {
+        "type": "String"
+      }
+    }
+  }
 }