implement Navigation 3 and Movie Details screen

- Update Android Gradle Plugin to 8.9.1 and target SDK to 36.
- Integrate `androidx.navigation3` for Compose-based navigation management.
- Implement a centralized `NavigationManager` and `Route` system (supporting `Home` and `Movie` routes).
- Add a comprehensive Movie Details screen featuring hero images, synopsis, metadata chips, and cast lists.
- Refactor `HomePage` and related components into a dedicated `hu.bbara.purefin.app.home` package.
- Enhance `JellyfinApiClient` with methods to fetch item details and "next up" episodes.
- Update `PurefinActivity` to use `NavDisplay` for handling app navigation and backstack.
- Setup Hilt modules for providing navigation-related dependencies.

app/build.gradle.kts

@@ -11,12 +11,12 @@ plugins {
 
 android {
     namespace = "hu.bbara.purefin"
-    compileSdk = 35
+    compileSdk = 36
 
     defaultConfig {
         applicationId = "hu.bbara.purefin"
         minSdk = 29
-        targetSdk = 35
+        targetSdk = 36
         versionCode = 1
         versionName = "1.0"
 
@@ -50,6 +50,7 @@ dependencies {
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.lifecycle.runtime.ktx)
     implementation(libs.androidx.lifecycle.viewmodel.compose)
+    implementation(libs.androidx.lifecycle.viewmodel.navigation3)
     implementation(libs.androidx.activity.compose)
     implementation(platform(libs.androidx.compose.bom))
     implementation(libs.androidx.compose.ui)
@@ -70,6 +71,8 @@ dependencies {
     implementation(libs.medi3.ui)
     implementation(libs.medi3.exoplayer)
     implementation(libs.medi3.ui.compose)
+    implementation(libs.androidx.navigation3.runtime)
+    implementation(libs.androidx.navigation3.ui)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)