android: bump to 0.2.5 (versionCode 7)

Carries "The Falls" rename and the lock-screen now-playing metadata + timer.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: JacobStephens2

apps/android/app/build.gradle.kts

@@ -15,8 +15,8 @@ android {
         applicationId = "page.stephens.cascade"
         minSdk = 26
         targetSdk = 35
-        versionCode = 6
-        versionName = "0.2.4"
+        versionCode = 7
+        versionName = "0.2.5"
 
         ndk {
             // Keep parity with cargo-ndk targets in the build script below.