release: bump to v0.4.6 (versionCode 33)

Sessions loading regression now properly tested in CI — CUA sessions_reload
phase confirmed passing. Also: support email, descriptions, screenshots.

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/mobile",
-  "version": "0.4.5",
+  "version": "0.4.6",
   "private": true,
   "main": "expo-router/entry",
   "scripts": {
@@ -55,4 +55,4 @@
       ]
     }
   }
-}
+}