v1.5.0: Jetpack Compose Settings Redesign + Fixes

Features:
- ✨ Complete Settings UI redesign with Jetpack Compose
- 🎨 Material 3 Design with Dynamic Colors (Material You)
- 📊 6 logical settings groups in separate screens:
  * Server Settings (URL, Credentials, Connection Test)
  * Sync Settings (Auto-Sync, Interval 15/30/60 min)
  * Markdown Desktop Integration (Auto-Sync for .md files)
  * Backup & Restore (Local/Server)
  * About this App (Version, GitHub, License)
  * Debug & Diagnostics (File Logging, Log Export)

Bugfixes (ported from old SettingsActivity):
- 🔧 Fix #1: Server URL prefix (http://|https://) auto-set on init
- 🔧 Fix #2: Battery optimization dialog on Auto-Sync enable
- 🔧 Fix #3: Markdown initial export on feature activation

Implementation Details:
- SettingsViewModel with Kotlin Flows state management
- SettingsEvent system for Activity-level actions (dialogs, intents)
- Reusable Compose components (SettingsCard, Switch, RadioGroup, etc.)
- Progress dialog for markdown initial export
- Edge-to-edge display with system bar handling
- Navigation Compose for screen transitions with back button

Breaking Changes:
- Old SettingsActivity.kt (1147 lines) no longer used
  (Can be removed in future as legacy code)

android/gradle/libs.versions.toml

@@ -11,6 +11,11 @@ activity = "1.8.0"
 constraintlayout = "2.1.4"
 ktlint = "12.1.0"
 detekt = "1.23.4"
+# Jetpack Compose v1.5.0
+composeBom = "2024.02.00"
+navigationCompose = "2.7.6"
+lifecycleRuntimeCompose = "2.7.0"
+activityCompose = "1.8.2"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -21,10 +26,22 @@ androidx-appcompat = { group = "androidx.appcompat", name = "appcompat", version
 material = { group = "com.google.android.material", name = "material", version.ref = "material" }
 androidx-activity = { group = "androidx.activity", name = "activity", version.ref = "activity" }
 androidx-constraintlayout = { group = "androidx.constraintlayout", name = "constraintlayout", version.ref = "constraintlayout" }
+# Jetpack Compose v1.5.0
+androidx-compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "composeBom" }
+androidx-compose-ui = { group = "androidx.compose.ui", name = "ui" }
+androidx-compose-ui-graphics = { group = "androidx.compose.ui", name = "ui-graphics" }
+androidx-compose-ui-tooling = { group = "androidx.compose.ui", name = "ui-tooling" }
+androidx-compose-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-tooling-preview" }
+androidx-compose-material3 = { group = "androidx.compose.material3", name = "material3" }
+androidx-compose-material-icons = { group = "androidx.compose.material", name = "material-icons-extended" }
+androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }
+androidx-navigation-compose = { group = "androidx.navigation", name = "navigation-compose", version.ref = "navigationCompose" }
+androidx-lifecycle-runtime-compose = { group = "androidx.lifecycle", name = "lifecycle-runtime-compose", version.ref = "lifecycleRuntimeCompose" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
 kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
+kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 ktlint = { id = "org.jlleitschuh.gradle.ktlint", version.ref = "ktlint" }
 detekt = { id = "io.gitlab.arturbosch.detekt", version.ref = "detekt" }