Add Wait command and delayed screenshot handling; sanitize screen-element history to limit verbosity

[Android-PowerUser]

Motivation

• Allow the AI to schedule delayed screenshots and avoid triggering multiple immediate screenshot requests by introducing a Wait command and delaying screenshot execution.
• Prevent chat history bloat and leaking outdated UI details by sanitizing repeated "Screen elements:" sections and keeping only the most recent relevant ones.
• Make unit tests more stable by enabling default return values for unit tests in the Gradle config.

Description

• Add a new Command.Wait(seconds: Long) type and parsing support in CommandParser with a regex and logging, and display the wait command in the UI (PhotoReasoningScreen).
• Implement delayed screenshot behavior in ScreenOperatorAccessibilityService via a pendingScreenshotDelayMillis field and a new executeTakeScreenshotCommand() function that either executes immediately or posts a delayed capture using handler.postDelayed, preserving previous screenshot broadcast behavior.
• Introduce PhotoReasoningScreenElementHistoryPolicy to sanitize message lists by marking older "Screen elements:" sections as "no longer relevant" and keep at most three recent relevant sections, and integrate this sanitizer across history builders, mutations, view model API payload construction, saving/loading of chat history, and other relevant places (PhotoReasoningHistoryBuilder, PhotoReasoningMessageMutations, PhotoReasoningViewModel, etc.).
• Add unit test support: enable testOptions.unitTests.isReturnDefaultValues = true in app/build.gradle.kts.
• Add tests: PhotoReasoningScreenElementHistoryPolicyTest to verify sanitization behavior and extend CommandParserTest to assert Wait parsing.

Testing

• Ran unit tests with ./gradlew :app:testDebugUnitTest, and all unit tests including PhotoReasoningScreenElementHistoryPolicyTest and the extended CommandParserTest passed.
• No instrumentation or UI tests were run as part of this change.

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Codex Task

[amazon-q-developer]

The Wait command feature implementation looks good overall. The changes are well-coordinated across all the necessary files:

• ✅ Command definition added correctly
• ✅ Parser patterns updated with proper regex
• ✅ Execution logic properly handles delays before screenshot
• ✅ UI displays Wait commands correctly
• ✅ Unit test coverage added

The implementation correctly allows delaying screenshot capture, which addresses the stated requirement. No blocking issues found.

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