[DRO-2625] Prevent false SystemUI app exits

[RasulOs]

Summary

• validate app transitions only from confirmed active/focused TYPE_APPLICATION windows
• keep foreground transition state separate from accessibility-event package/cache bookkeeping
• preserve existing event names, payloads, trigger schemas, raw event handlers, and [Android] Non-focusable PopupWindow is visible but missing from the UIAutomator node tree #155 multi-root behavior
• suppress notification-shade/SystemUI noise while retaining genuine app transitions such as Portal ↔ Settings, launcher, and PermissionController

Internal companion: https://github.com/droidrun/mobilerun-portal-internal/pull/78

Behavior

• the first confirmed foreground app emits only APP_ENTERED
• a genuine A → B transition emits one APP_EXITED, then one APP_ENTERED
• repeated packages and Portal → SystemUI → Portal notification-shade sequences emit nothing
• currentActivityName advances only with the same confirmed application-window evidence

Validation

Host:

• focused resolver/tracker tests: 18 passed
• :app:testDebugUnitTest: 551 tests; only the documented pre-existing SwitchTintResourceTest.trackTintSeparatesCheckedAndUncheckedStates failure
• lintDebug, :app:assembleDebug, and git diff --check: passed

Android 16 / API 36:

• instrumentation: 7/7 passed
• UI-driven trigger smoke: all 12 assertions passed
• notification shade held open across a clock update: zero APP_* events and zero app-trigger runs
• Portal ↔ Settings and Portal ↔ PermissionController: one exact transition pair in each direction
• notification debounce/removal and legacy duplicate suppression: passed
• sanitized crash/ANR/accessibility/listener/WebSocket log gate: clean

Android 15 / API 35 (16 KB pages):

• instrumentation: 7/7 passed
• the same 12 trigger assertions and genuine-transition checks passed
• sanitized log and cleanup gates: clean

Both device sessions were local-only with a blank launch token; cloud state was disconnected with no stored token or active task.

Related to DRO-2625

[github-actions]

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