Refactor: Use Gradle version catalog

This commit introduces the Gradle version catalog (`libs.versions.toml`) to manage dependencies and plugin versions centrally.

Key changes:
- Added `gradle/libs.versions.toml` defining versions, libraries, plugins, and bundles.
- Updated `app/build.gradle.kts` to reference dependencies and plugins from the version catalog.
- Updated project-level `build.gradle.kts` to use plugin aliases from the version catalog.

app/build.gradle.kts

@@ -1,17 +1,17 @@
 plugins {
-    id("com.android.application")
-    id("org.jetbrains.kotlin.android")
-    id("kotlin-parcelize")
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.kotlin.parcelize)
 }
 
 android {
     namespace = "com.bitchat.android"
-    compileSdk = 34
+    compileSdk = libs.versions.compileSdk.get().toInt()
 
     defaultConfig {
         applicationId = "com.bitchat.android"
-        minSdk = 26  // API 26 for proper BLE support
-        targetSdk = 34
+        minSdk = libs.versions.minSdk.get().toInt()
+        targetSdk = libs.versions.targetSdk.get().toInt()
         versionCode = 1
         versionName = "1.0"
 
@@ -41,7 +41,7 @@ android {
         compose = true
     }
     composeOptions {
-        kotlinCompilerExtensionVersion = "1.5.5"
+        kotlinCompilerExtensionVersion = libs.versions.compose.compiler.get()
     }
     packaging {
         resources {
@@ -56,54 +56,45 @@ android {
 }
 
 dependencies {
-    implementation("androidx.core:core-ktx:1.12.0")
-    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
-    implementation("androidx.activity:activity-compose:1.8.2")
-    implementation(platform("androidx.compose:compose-bom:2023.10.01"))
-    implementation("androidx.compose.ui:ui")
-    implementation("androidx.compose.ui:ui-graphics")
-    implementation("androidx.compose.ui:ui-tooling-preview")
-    implementation("androidx.compose.material3:material3")
+    // Core Android dependencies
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.activity.compose)
+    implementation(libs.androidx.appcompat)
     
-    // AppCompat for theme support
-    implementation("androidx.appcompat:appcompat:1.6.1")
+    // Compose
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.bundles.compose)
     
-    // ViewModel and LiveData
-    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.7.0")
-    implementation("androidx.lifecycle:lifecycle-livedata-ktx:2.7.0")
-    implementation("androidx.compose.runtime:runtime-livedata")
+    // Lifecycle
+    implementation(libs.bundles.lifecycle)
     
     // Navigation
-    implementation("androidx.navigation:navigation-compose:2.7.6")
+    implementation(libs.androidx.navigation.compose)
     
     // Permissions
-    implementation("com.google.accompanist:accompanist-permissions:0.32.0")
+    implementation(libs.accompanist.permissions)
     
     // Cryptography
-    implementation("org.bouncycastle:bcprov-jdk15on:1.70")
-    implementation("com.google.crypto.tink:tink-android:1.10.0")
+    implementation(libs.bundles.cryptography)
     
     // JSON
-    implementation("com.google.code.gson:gson:2.10.1")
+    implementation(libs.gson)
     
     // Coroutines
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3")
+    implementation(libs.kotlinx.coroutines.android)
     
     // Bluetooth
-    implementation("no.nordicsemi.android:ble:2.6.1")
+    implementation(libs.nordic.ble)
     
     // Compression
-    implementation("org.lz4:lz4-java:1.8.0")
+    implementation(libs.lz4.java)
     
     // Security preferences
-    implementation("androidx.security:security-crypto:1.1.0-alpha06")
+    implementation(libs.androidx.security.crypto)
     
     // Testing
-    testImplementation("junit:junit:4.13.2")
-    androidTestImplementation("androidx.test.ext:junit:1.1.5")
-    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
-    androidTestImplementation(platform("androidx.compose:compose-bom:2023.10.01"))
-    androidTestImplementation("androidx.compose.ui:ui-test-junit4")
-    debugImplementation("androidx.compose.ui:ui-tooling")
-    debugImplementation("androidx.compose.ui:ui-test-manifest")
+    testImplementation(libs.bundles.testing)
+    androidTestImplementation(platform(libs.androidx.compose.bom))
+    androidTestImplementation(libs.bundles.compose.testing)
+    debugImplementation(libs.androidx.compose.ui.tooling)
 }