feat(update): notify about app updates on launch (chat banner) (#891)

Fires one silent update check per installed version at app start
(UpdateNoticeManager, release builds only) and shows a non-blocking
banner on the chat screen when a newer release exists. The About tab
adopts the launch result instead of re-pinging GitHub; dismissals
return on the next launch via the persisted latest tag.

Closes #890

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/HermesControlApp.kt

@@ -9,6 +9,7 @@ import coil.decode.ImageDecoderDecoder
 import com.m57.hermescontrol.data.local.AuthManager
 import com.m57.hermescontrol.data.remote.NetworkMonitor
 import com.m57.hermescontrol.data.remote.OkHttpProvider
+import com.m57.hermescontrol.data.update.UpdateNoticeManager
 import com.m57.hermescontrol.ui.analytics.AnalyticsPreloader
 
 class HermesControlApp :
@@ -25,6 +26,9 @@ class HermesControlApp :
         // so the tab renders instantly when opened (the usage endpoint is slow on a
         // cold backend). Fire-and-forget; never blocks UI startup.
         AnalyticsPreloader.preload(this)
+        // Issue #890: silent once-per-version update check right after launch,
+        // so the chat screen can show an update banner without user interaction.
+        UpdateNoticeManager.checkOnLaunch()
     }
 
     override fun newImageLoader(): ImageLoader =