Configure .gitignore to properly ignore build artifacts

- Add comprehensive Android/Gradle ignore patterns
- Ignore compiled output, dependencies, and sensitive files
- Remove tracked build artifacts from repository

.gitignore

@@ -1,7 +1,92 @@
-# Ignore Windows reserved files
-NUL
+# Built application files
+*.apk
+*.aar
+*.ap_
+*.aab
 
-# Android/ Gradle build outputs (optional for CI, can be kept locally if desired)
-**/build/
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+build/
+
+# Gradle files
 .gradle/
-app/my-release.jks
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Android Studio captures folder
+captures/
+
+# IntelliJ
+*.iml
+.idea/
+misc.xml
+deploymentTargetSelector.xml
+markdown.xml
+migrations.xml
+runConfigurations.xml
+
+# Keystore files
+*.jks
+*.keystore
+
+# External native build folder generated in Android Studio 2.2 and later
+.externalNativeBuild
+.cxx/
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# Freeline
+freeline.py
+freeline/
+freeline_project_description.json
+
+# fastlane
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+fastlane/readme.md
+
+# Version control
+vcs.xml
+
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# Android generated crash logs
+crashlytics-build.properties
+
+# Android Profiling
+*.hprof
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+
+# AirTest
+airtest.log
+log.txt
+storage/
+
+# Project specific
+NUL
+my-release.jks
+app/my-release.jks