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/scripts/install-debug-emulator.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# Installiert composeApp im Debug-Modus mit Emulator-tauglicher Backend-URL (Host-PC).
+# Nutzung: von mobile-app/ aus: ./scripts/install-debug-emulator.sh
+set -euo pipefail
+cd "$(dirname "$0")/.."
+adb uninstall de.tt_tagebuch.app 2>/dev/null || true
+./gradlew :composeApp:clean :composeApp:installDebug \
+  -PbackendBaseUrl=http://10.0.2.2:3005 \
+  --no-configuration-cache