chore(release): v0.4.13 (versionCode 40) — waitlist retry queue (#166)

* chore(release): v0.4.13 (versionCode 40) — waitlist retry queue reaches users

Ships 2f81d34 (#165): failed waitlist signups are persisted on-device and
retried on app foreground instead of silently falling back to mailto.
Until this Play release, no user is running that fix.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

* fix(waitlist): stamp the app version into the mailto escape hatch

AGE-100 asks for the post-release mailto count "split by app version where the
mail body allows it". It did not allow it: the body was "Sign me up!\n\nEmail: x"
and nothing else, so a mail from an unreachable pre-v0.4.8 sideload is byte-identical
to one from a current build whose retry queue leaked. Those two readings have
opposite meanings — the first is the known permanent cohort, the second is a defect.

Now the escape hatch appends "App: OpenCode Mobile v<version>" (app.json, same
source Sentry uses). Absence of the line == pre-v0.4.13 build. waitlist.ts stays
free of react-native/JSON imports; the screen injects the version.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

---------

Co-authored-by: engineer <engineer@macbookpro.lan>
Co-authored-by: Paperclip <noreply@paperclip.ing>

android/app/build.gradle

@@ -94,8 +94,8 @@ android {
         applicationId 'cc.agentlabs.opencode'
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 39
-        versionName "0.4.12"
+        versionCode 40
+        versionName "0.4.13"
 
         buildConfigField "String", "REACT_NATIVE_RELEASE_LEVEL", "\"${findProperty('reactNativeReleaseLevel') ?: 'stable'}\""
     }