feat(store): advisory-version badge for federated entries

Store cards + detail-sheet now prefix the version pill with
`~` and attach a tooltip for federated entries (MCP / n8n /
Temporal). Upstream services don't honour semver, so the
version pill is a label, not a contract — the tilde says
"this number may change without a version bump."

Three render sites updated to stay visually consistent:
- compact card pill in grid view
- expanded card pill row
- detail-sheet header pill cluster

EN + DE l10n entries added (`storeAdvisoryVersionTooltip`)
and `app_localizations.dart` regenerated.

dart analyze clean; flutter test green (11 tests).

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/l10n/app_de.arb

@@ -776,6 +776,7 @@
       }
     }
   },
+  "storeAdvisoryVersionTooltip": "Föderierter Upstream-Dienst — Version ist Richtwert; der Upstream kann ohne Versionsanhebung Kompatibilität brechen.",
   "maintenanceHeader": "HUB-WARTUNG",
   "maintenanceResetBlurb": "Operator-Zustand zurücksetzen und mit einem sauberen Hub neu starten. Stoppt jeden laufenden Daemon, sichert ~/.fai/ atomar in ein Backup, legt es dann neu an — Binary, Channel-Pointer, MCP-/n8n-/System-AI-Konfiguration und Registry-Token bleiben erhalten. Wiederherstellen durch Zurückverschieben des Backup-Ordners.",
   "maintenanceKeepModulesTitle": "Installierte Module behalten",

lib/l10n/app_en.arb

@@ -779,6 +779,7 @@
       }
     }
   },
+  "storeAdvisoryVersionTooltip": "Federated upstream service — version is advisory; the upstream may break compatibility without bumping it.",
   "maintenanceHeader": "HUB MAINTENANCE",
   "maintenanceResetBlurb": "Wipe operator state and start over with a clean hub. Stops every running daemon, atomically backs ~/.fai/ up, then recreates it with the binary, channel state, MCP / n8n / system-AI config, and registry token preserved. Restore by moving the backup directory back.",
   "maintenanceKeepModulesTitle": "Keep installed modules",

lib/l10n/app_localizations.dart

@@ -2246,6 +2246,12 @@ abstract class AppLocalizations {
   /// **'Could not save: {error}'**
   String hubAuthTokenSaveFailedToast(String error);
 
+  /// No description provided for @storeAdvisoryVersionTooltip.
+  ///
+  /// In en, this message translates to:
+  /// **'Federated upstream service — version is advisory; the upstream may break compatibility without bumping it.'**
+  String get storeAdvisoryVersionTooltip;
+
   /// No description provided for @maintenanceHeader.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_de.dart

@@ -1284,6 +1284,10 @@ class AppLocalizationsDe extends AppLocalizations {
     return 'Speichern fehlgeschlagen: $error';
   }
 
+  @override
+  String get storeAdvisoryVersionTooltip =>
+      'Föderierter Upstream-Dienst — Version ist Richtwert; der Upstream kann ohne Versionsanhebung Kompatibilität brechen.';
+
   @override
   String get maintenanceHeader => 'HUB-WARTUNG';
 

lib/l10n/app_localizations_en.dart

@@ -1299,6 +1299,10 @@ class AppLocalizationsEn extends AppLocalizations {
     return 'Could not save: $error';
   }
 
+  @override
+  String get storeAdvisoryVersionTooltip =>
+      'Federated upstream service — version is advisory; the upstream may break compatibility without bumping it.';
+
   @override
   String get maintenanceHeader => 'HUB MAINTENANCE';