implement Hilt, DataStore, and Jellyfin SDK

- Setup Hilt for dependency injection and KSP for annotation processing.
- Add DataStore for user session management with JSON serialization.
- Integrate Jellyfin SDK and create a basic `JellyfinApiClient`.
- Replace `MainActivity` with `PurefinActivity` featuring a login flow and a placeholder home screen.
- Implement custom UI components: `PurefinComplexTextField`, `PurefinPasswordField`, and `PurefinTextButton`.
- Update version catalog with new dependencies and downgrade SDK versions to 35.

app/build.gradle.kts

@@ -1,18 +1,22 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 plugins {
     alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
     alias(libs.plugins.kotlin.compose)
+    alias(libs.plugins.kotlin.serialization)
+    alias(libs.plugins.hilt)
+    alias(libs.plugins.ksp)
 }
 
 android {
     namespace = "hu.bbara.purefin"
-    compileSdk {
-        version = release(36)
-    }
+    compileSdk = 35
 
     defaultConfig {
         applicationId = "hu.bbara.purefin"
         minSdk = 29
-        targetSdk = 36
+        targetSdk = 35
         versionCode = 1
         versionName = "1.0"
 
@@ -23,8 +27,7 @@ android {
         release {
             isMinifyEnabled = false
             proguardFiles(
-                getDefaultProguardFile("proguard-android-optimize.txt"),
-                "proguard-rules.pro"
+                getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro"
             )
         }
     }
@@ -37,15 +40,28 @@ android {
     }
 }
 
+kotlin {
+    compilerOptions {
+        jvmTarget.set(JvmTarget.JVM_11)
+    }
+}
+
 dependencies {
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.lifecycle.runtime.ktx)
+    implementation(libs.androidx.lifecycle.viewmodel.compose)
     implementation(libs.androidx.activity.compose)
     implementation(platform(libs.androidx.compose.bom))
     implementation(libs.androidx.compose.ui)
     implementation(libs.androidx.compose.ui.graphics)
     implementation(libs.androidx.compose.ui.tooling.preview)
     implementation(libs.androidx.compose.material3)
+    implementation(libs.androidx.compose.material.icons.extended)
+    implementation(libs.jellyfin.core)
+    implementation(libs.kotlinx.serialization.json)
+    implementation(libs.hilt)
+    implementation(libs.androidx.hilt.navigation.compose)
+    implementation(libs.datastore)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)
@@ -53,4 +69,5 @@ dependencies {
     androidTestImplementation(libs.androidx.compose.ui.test.junit4)
     debugImplementation(libs.androidx.compose.ui.tooling)
     debugImplementation(libs.androidx.compose.ui.test.manifest)
-}
+    ksp(libs.hilt.compiler)
+}