fix: add MAIN/LAUNCHER flags to Android launcher activity resolver

[EarthXP]

Summary

• Add -a android.intent.action.MAIN -c android.intent.category.LAUNCHER to the resolve-activity fallback command in resolveAndroidLaunchComponent()
• The resolver was missing these intent flags, causing it to resolve the wrong activity on multi-entry apps (e.g. Microsoft Outlook)
• E2E testing uncovered a deeper issue: am start -W -p <package> exits with code 0 even when it fails to resolve the activity, printing Error: Activity not started, unable to resolve Intent to stdout. The original try/catch never triggered the fallback because runCmd did not throw on exit code 0. Added isAmStartError() to detect this silent failure and correctly fall through to the component-based fallback.
• Add unit tests for resolver parsing, error detection, and launch command construction

Changes

Commit 1: Fix resolve-activity flags

resolveAndroidLaunchComponent() now passes -a android.intent.action.MAIN -c android.intent.category.LAUNCHER to cmd package resolve-activity, ensuring the correct launcher activity is resolved for multi-entry apps.

Commit 2: Detect am start silent failures

• Replace try/catch with allowFailure: true + stdout/stderr inspection via isAmStartError()
• am start -p returning exit code 0 with Error: Activity not started in stdout now correctly triggers the component-based fallback
• Verified end-to-end on a physical Android device with Microsoft Outlook

Test plan

• parseAndroidLaunchComponent correctly parses multi-entry resolve output
• isAmStartError detects am start failure messages in stdout
• isAmStartError returns false for successful launches
• Fallback resolve-activity command includes -a MAIN -c LAUNCHER flags
• Default launch path still uses -p <package> (system-driven resolution)
• E2E: agent-device open "com.microsoft.office.outlook" --platform android launches Outlook without --activity flag on physical device

[EarthXP]

Have tested in my Android phone (Android 12) which didn't work before, now it works with the fix.