Update dependencies to latest + migrate to AGP 9.x

Kotlin 2.1.0->2.4.10, Compose Multiplatform 1.7.3->1.11.1, AGP 8.7.3->9.3.1, Gradle 8.10.2->9.7.1. The two libs that pinned us to Compose 1.7.x -- compose-webview-multiplatform (1.9.40->2.0.3) and multiplatform-markdown-renderer (0.33.0->0.44.0) -- now have Compose 1.8+ releases, so the whole stack moves. Also coroutines/serialization 1.11.0, okhttp 5.5.0, media3 1.11.0, activity-compose 1.13.0, firebase-messaging 25.1.2, compose-bom 2026.08.00, google-services 4.5.0, KCEF 2025.03.23 (JBR pin ->17.0.14); material3 1.9.0 / material-icons-extended 1.7.3 (each one's latest stable -- they lag the core).

AGP 9 migration: :shared swaps com.android.library->com.android.kotlin.multiplatform.library (android config moves into kotlin{android{}}, withHostTest{} keeps host tests); :androidApp drops kotlin(android) for AGP 9 built-in Kotlin. compileSdk 34->37 (minSdk stays 29 / Android 10).

Code fixes for API breaks: markdown link->textLink + highlights->highlightsBuilder; kotlinOptions{jvmTarget}->compilerOptions{jvmTarget}.

app/shared/build.gradle.kts

@@ -1,27 +1,41 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 plugins {
     kotlin("multiplatform")
     kotlin("plugin.serialization")
-    id("com.android.library")
+    id("com.android.kotlin.multiplatform.library")
     id("org.jetbrains.compose")
     id("org.jetbrains.kotlin.plugin.compose")
 }
 
-val composeVersion = "1.7.3"
-val coroutinesVersion = "1.9.0"
-val serializationVersion = "1.7.3"
-val okhttpVersion = "4.12.0"
-// Pinned to 1.9.40: the last release built against Compose 1.7.x (1.7.1);
-// 2.0.x moves to Compose 1.8+. HTML artifact previews (M9): Android uses the
+val composeVersion = "1.11.1"
+// material3 and material-icons-extended are published on their own cadence and
+// lag the core artifacts; use each one's latest stable release.
+val material3Version = "1.9.0"
+val materialIconsVersion = "1.7.3"
+val coroutinesVersion = "1.11.0"
+val serializationVersion = "1.11.0"
+val okhttpVersion = "5.5.0"
+// 2.0.x is the first line built against Compose 1.8+ (1.9.40 was the last
+// 1.7.x-compatible release). HTML artifact previews (M9): Android uses the
 // platform WebView, desktop uses KCEF (JCEF/Chromium, downloaded on first use).
-val webviewVersion = "1.9.40"
-val kcefVersion = "2024.04.20.3"
-// Pinned to 0.33.0: the last release built against Compose 1.7.x / Kotlin 2.1.x
-// (0.34.0+ moves to Compose 1.8+). Provides GFM tables, bold/italic/underscore,
-// and the -code module for language-aware syntax highlighting (Highlights).
-val markdownVersion = "0.33.0"
+val webviewVersion = "2.0.3"
+val kcefVersion = "2025.03.23"
+// 0.34.0+ moved to Compose 1.8+ (0.33.0 was the last 1.7.x / Kotlin 2.1.x
+// release). Provides GFM tables, bold/italic/underscore, and the -code module
+// for language-aware syntax highlighting (Highlights).
+val markdownVersion = "0.44.0"
 
 kotlin {
-    androidTarget()
+    android {
+        namespace = "iris.shared"
+        compileSdk = 37
+        minSdk = 29
+        compilerOptions {
+            jvmTarget.set(JvmTarget.JVM_17)
+        }
+        withHostTest { }
+    }
     jvm("desktop")
 
     sourceSets {
@@ -34,11 +48,11 @@ kotlin {
         commonMain.dependencies {
             implementation("org.jetbrains.compose.runtime:runtime:$composeVersion")
             implementation("org.jetbrains.compose.foundation:foundation:$composeVersion")
-            implementation("org.jetbrains.compose.material3:material3:$composeVersion")
+            implementation("org.jetbrains.compose.material3:material3:$material3Version")
             implementation("org.jetbrains.compose.ui:ui:$composeVersion")
             // Full Material icon set (Icons.Filled.ContentCopy for the code
             // copy buttons); -core only ships a small subset.
-            implementation("org.jetbrains.compose.material:material-icons-extended:$composeVersion")
+            implementation("org.jetbrains.compose.material:material-icons-extended:$materialIconsVersion")
             implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion")
             implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:$serializationVersion")
             // OkHttp is a JVM library; both targets here are JVM-based
@@ -68,26 +82,14 @@ kotlin {
             // M7: EncryptedSharedPreferences for the pairing token
             // (docs/09 §9.7; AndroidSecureStore).
             implementation("androidx.security:security-crypto:1.1.0")
-            implementation("androidx.media3:media3-exoplayer:1.3.1")
-            implementation("androidx.media3:media3-ui:1.3.1")
+            implementation("androidx.media3:media3-exoplayer:1.11.0")
+            implementation("androidx.media3:media3-ui:1.11.0")
             // SAF picker (rememberLauncherForActivityResult).
-            implementation("androidx.activity:activity-compose:1.9.2")
+            implementation("androidx.activity:activity-compose:1.13.0")
             // M5: FCM push (inert without a Firebase project / google-services.json;
             // the ntfy listener is the fallback). The google-services plugin is
             // applied conditionally in the app module.
-            implementation("com.google.firebase:firebase-messaging:23.1.2")
+            implementation("com.google.firebase:firebase-messaging:25.1.2")
         }
     }
-}
-
-android {
-    namespace = "iris.shared"
-    compileSdk = 34
-    defaultConfig {
-        minSdk = 29
-    }
-    compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_17
-        targetCompatibility = JavaVersion.VERSION_17
-    }
 }