Improve turn completion notifications

[siddheshkothadi]

Motivation

• Ensure completed-turn notifications appear as heads-up popups and are easier to identify in the notification shade by using the app artwork and stronger channel importance.

Description

• Raise the completed-turn notification channel to IMPORTANCE_HIGH and recreate the channel when an existing channel has lower importance to enable heads-up behavior and stronger alerts.
• Enable vibration and notification lights on the turn channel and set sensible defaults for per-notification alerts.
• Use the app launcher artwork for the notification by switching the small icon to ic_launcher_foreground and loading the app icon as the large icon via packageManager.getApplicationIcon(...).toBitmap().
• Increase per-notification priority to PRIORITY_HIGH and set DEFAULT_ALL so pre-Oreo devices also receive popup-style behavior; added androidx.core.graphics.drawable.toBitmap import and updated CodexDroidNotifications.kt.

Testing

• Attempted to run bash ./gradlew :app:compileDebugKotlin to validate Kotlin compilation, but the build could not run in the environment due to a missing Android SDK configuration (ANDROID_HOME / local.properties sdk.dir), so compilation could not be verified here.

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid deleting and recreating the turn channel with the same ID

On Android 8+ this migration does not actually raise existing users to IMPORTANCE_HIGH. NotificationManager.createNotificationChannel() preserves the prior settings for an existing/deleted channel ID, so when turn_events was already created at IMPORTANCE_DEFAULT (or the user later lowered/blocked it), deleting and recreating it here restores the same lower importance instead of enabling heads-up alerts. That means the new behavior never takes effect for those installs, and ensureTurnChannel() will keep deleting/recreating the channel on every completed-turn notification, which also increments Android's visible "deleted channels" counter in Settings.

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