chore: update .gitignore and enhance backend and mobile app functionality

- Added mobile app build directories and configuration files to .gitignore for cleaner repository management.
- Improved error handling in diaryMemberController by requiring diaryDateId and memberId query parameters.
- Refactored DiaryMemberService to log tag IDs instead of raw values for better debugging.
- Enhanced TournamentParticipantsTab and TournamentTab components with improved touch-action properties for better user experience.
- Updated mobile app's gradle.properties and build.gradle.kts for compatibility with AGP 9.x and Kotlin 2.1.21, including new dependencies for Coil and UCrop.
- Refactored MainApplication to simplify initialization and improved MainActivity to handle dependencies more robustly.
- Updated various UI components in the mobile app to enhance layout and functionality, including MemberDetailScreen and MemberEditScreen.

mobile-app/iosApp/README.md

@@ -0,0 +1,20 @@
+# iOS App (SwiftUI) – Setup (Planned)
+
+Das Repo enthält aktuell den Shared-Code in `mobile-app/shared/` (KMP).
+Dieser baut iOS-Frameworks (`TTShared`) für:
+- `iosX64`
+- `iosArm64`
+- `iosSimulatorArm64`
+
+## Nächste Schritte (wenn wir iOS aktivieren)
+1. Xcode: neues SwiftUI App-Projekt anlegen (`iosApp/Trainingstagebuch.xcodeproj`).
+2. Shared Framework einbinden:
+   - Option A (empfohlen): XCFramework Build Task in Gradle + Einbindung als binary target.
+   - Option B: CocoaPods Integration (KMP cocoapods plugin).
+3. iOS Keychain Token Storage implementieren und in Shared injizieren.
+4. SwiftUI Screens:
+   - Login
+   - Shell (Tabs)
+
+Hinweis: Die konkrete Einbindung hängt davon ab, ob ihr SPM vs CocoaPods bevorzugt.
+