Job-Identifikation auf externalId umstellen und Tour-State persistieren

- Job-Löschung und -Anzeige nutzen externalId statt interner id
- RefreshBadgesMessage korrekt instanziieren
- Tour-State beim Abschluss in Job.tours zurückschreiben und persistieren
- Version auf 352 erhöht

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 349.0.0+349
+version: 352.0.0+352
 
 environment:
   sdk: '>=3.9.0 <4.0.0'