fix(test): Reset shade state between retries and recreate notification channel

Two issues found from analyzing the accessibility hierarchy dump:

1. Repeated swipe-downs accumulated into full quick settings expansion,
   hiding the notification list. Fix: press home before each swipe retry
   to reset the shade state, so each attempt opens a fresh notification
   shade instead of expanding quick settings further.

2. adb install -r preserves app data including notification channels.
   The old IMPORTANCE_DEFAULT channel persists and Android ignores the
   code change to IMPORTANCE_HIGH. Fix: delete the channel before
   recreating it to ensure correct importance.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: romtsn

sentry-android-integration-tests/sentry-uitest-android-critical/maestro/appStart.yaml

@@ -37,10 +37,12 @@ name: App Start Tests
     while:
       notVisible: "Sentry Test Notification"
     commands:
-      # Short swipe to open notification shade without expanding to quick settings
+      # Reset to home screen first to prevent swipes from accumulating
+      # into quick settings expansion
+      - pressKey: home
       - swipe:
           start: 50%, 0%
-          end: 50%, 25%
+          end: 50%, 40%
           duration: 500
       - waitForAnimationToEnd
 - tapOn: "Sentry Test Notification"
@@ -68,10 +70,12 @@ name: App Start Tests
     while:
       notVisible: "Sentry Test Notification"
     commands:
-      # Short swipe to open notification shade without expanding to quick settings
+      # Reset to home screen first to prevent swipes from accumulating
+      # into quick settings expansion
+      - pressKey: home
       - swipe:
           start: 50%, 0%
-          end: 50%, 25%
+          end: 50%, 40%
           duration: 500
       - waitForAnimationToEnd
 - tapOn: "Sentry Test Notification"

sentry-android-integration-tests/sentry-uitest-android-critical/src/main/java/io/sentry/uitest/android/critical/NotificationHelper.kt

@@ -19,7 +19,10 @@ object NotificationHelper {
       context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
 
     // Create notification channel for Android 8.0+ (API 26+)
+    // Delete first to ensure the channel is recreated with the correct importance,
+    // since Android preserves channel settings across app reinstalls (adb install -r).
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+      notificationManager.deleteNotificationChannel(CHANNEL_ID)
       val channel =
         NotificationChannel(CHANNEL_ID, "Notifications", NotificationManager.IMPORTANCE_HIGH)
       channel.description = "description"