chore(release): v0.4.15 — the app can finally tell you it is out of date

Carries the two AGE-110 mechanisms: the in-app update check (#179) and the
first release whose tag push publishes straight to Play production (#177).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

app.json

@@ -2,7 +2,7 @@
   "expo": {
     "name": "OpenCode",
     "slug": "opencode-mobile",
-    "version": "0.4.14",
+    "version": "0.4.15",
     "orientation": "portrait",
     "scheme": "opencode",
     "userInterfaceStyle": "automatic",

distribution/whatsnew/whatsnew-en-US

@@ -1,3 +1,3 @@
-v0.4.14 — Quieter, more useful crash reporting
+v0.4.15 — The app now tells you when a new version is out
 
-Connection problems on your own network are no longer filed as crash reports, and a repeating error is now reported once instead of hundreds of times. Real crashes are still reported in full, so genuine problems still get fixed.
+If you installed OpenCode from a downloaded APK, F-Droid or a mirror, there was no way to find out that a newer version existed. The app now checks once a day and shows a small banner you can dismiss. Settings also shows the version you are actually running instead of a placeholder.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/mobile",
-  "version": "0.4.14",
+  "version": "0.4.15",
   "private": true,
   "main": "expo-router/entry",
   "scripts": {