chore(release): 0.4.9 (versionCode 36) — bundle core + notification fixes (#122)

Supersedes v0.4.8 (still on internal, not promoted) with everything merged
since: offline demo mode + first-run clarity (0.4.8), core session fixes
(#120: queued-message ghosting, selectSession race), and notification/
permission fixes (#121: permission never requested, wrong-session-on-back-nav,
misleading completion pushes, question double-reply). Production is on 0.4.5,
so promoting v0.4.9 gets users the full hardened app in one step.


Claude-Session: https://claude.ai/code/session_01T12AhSnQVrSxNnvwfCx2z6

Co-authored-by: engineer <engineer@macbookpro.lan>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

app.json

@@ -2,7 +2,7 @@
   "expo": {
     "name": "OpenCode",
     "slug": "opencode-mobile",
-    "version": "0.4.8",
+    "version": "0.4.9",
     "orientation": "portrait",
     "scheme": "opencode",
     "userInterfaceStyle": "automatic",
@@ -35,7 +35,7 @@
     },
     "android": {
       "package": "cc.agentlabs.opencode",
-      "versionCode": 35,
+      "versionCode": 36,
       "usesCleartextTraffic": true,
       "adaptiveIcon": {
         "foregroundImage": "./assets/adaptive-icon.png",