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>

fastlane/metadata/android/en-US/changelogs/36.txt

@@ -0,0 +1,8 @@
+v0.4.9 — smoother, more reliable, easier to start
+
+- New: "Try a demo" on the home screen — see OpenCode in action (chat, tool calls, diffs, approvals) without setting up a server first
+- Clearer first-time setup: the app now explains it needs a computer running `opencode serve` (on your network or via Tailscale) and links to a setup guide
+- More reliable notifications: you're now correctly asked for notification permission, and "task completed" pushes no longer fire for cancelled or failed runs
+- Fixed messages occasionally disappearing when you sent a second one quickly
+- Fixed the session view sometimes showing another session's messages after navigating back
+- Faster feedback when a server can't be reached, and a fix for the directory browser getting stuck