Rename Xcode project to honeyDue and fix all bundle IDs

- Rename iosApp.xcodeproj → honeyDue.xcodeproj
- Rename Casera schemes → HoneyDue, HoneyDueExtension, HoneyDueUITests
- Split bundle IDs per-config: Debug=com.tt.honeyDue.dev, Release=com.tt.honeyDue
- Split app groups per-config: Debug=group.com.tt.honeyDue.dev, Release=group.com.tt.honeyDue
- Fix com.t-t. typo → com.tt. in test bundle IDs
- Add APP_GROUP_IDENTIFIER build setting with variable substitution in entitlements
- Replace all hardcoded app group strings in Swift with Info.plist runtime reads
- Remove stale PRODUCT_BUNDLE_IDENTIFIER from Config.xcconfig
- Update test plan container references

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

iosApp/HoneyDue/HoneyDue.swift

@@ -110,7 +110,9 @@ class CacheManager {
         }
     }
 
-    private static let appGroupIdentifier = "group.com.tt.honeyDue.HoneyDueDev"
+    private static let appGroupIdentifier: String = {
+        Bundle.main.infoDictionary?["AppGroupIdentifier"] as? String ?? "group.com.tt.honeyDue.dev"
+    }()
     private static let tasksFileName = "widget_tasks.json"
 
     /// Get the shared App Group container URL