Track client and server sources

Co-authored-by: Cursor <cursoragent@cursor.com>

messenger-client/.gitignore

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+# Android Studio
+.idea/
+.gradle/
+build/
+app/build/
+app/release/
+local.properties
+.DS_Store
+Thumbs.db
+*.iml
+*.iws
+*.ipr
+*.bak
+
+# Firebase
+app/google-services.json
+
+# Keystore files
+*.jks
+*.keystore
+
+app/.cxx/
+
+captures/
+
+# Additional files
+*.log