release: bump to v0.4.7 (versionCode 34)

SSE disconnect banner, backgrounded permission notifications,
scrubUrl unit tests (13 tests, 81/81 suite green).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/mobile",
-  "version": "0.4.6",
+  "version": "0.4.7",
   "private": true,
   "main": "expo-router/entry",
   "scripts": {