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>

app.json

@@ -2,7 +2,7 @@
   "expo": {
     "name": "OpenCode",
     "slug": "opencode-mobile",
-    "version": "0.4.5",
+    "version": "0.4.6",
     "orientation": "portrait",
     "scheme": "opencode",
     "userInterfaceStyle": "automatic",
@@ -34,7 +34,7 @@
     },
     "android": {
       "package": "cc.agentlabs.opencode",
-      "versionCode": 32,
+      "versionCode": 33,
       "usesCleartextTraffic": true,
       "adaptiveIcon": {
         "foregroundImage": "./assets/adaptive-icon.png",
@@ -79,4 +79,4 @@
       "reactCompiler": true
     }
   }
-}
+}