build(android): bump Java to 25 and targetSdk to 37

Raise sourceCompatibility/targetCompatibility to Java 25 and Kotlin jvmTarget to JVM_25 across app and subprojects, and CI java-version to 25 (Kotlin 2.3.21 supports JVM_25). Bump targetSdk to 37 to match compileSdk. Building locally requires Flutter to use JDK 25 (flutter config --jdk-dir).

.github/workflows/release.yml

@@ -66,7 +66,7 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: "temurin"
-          java-version: "17"
+          java-version: "25"
 
       - name: Setup Go
         uses: actions/setup-go@v6