🛡️ Sentinel: Secure temporary file creation

[yuga-hashimoto]

🛡️ Sentinel: Secure temporary file creation

What:
Updated temporary file creation calls in ScreenRecordManager and CameraCaptureManager to explicitly use the application's secure cache directory (context.cacheDir) instead of the system default temporary directory.

Why:
Relying on the system default temporary directory for sensitive temporary files (like camera frames, screen recordings, or audio recordings) can expose the data to local file disclosure vulnerabilities. Explicitly writing these temporary files to the app's internal cache directory ensures they are properly sandboxed and protected by standard application filesystem permissions.

Security Impact:

• Fixes potential local temp file disclosure.
• Increases data isolation for sensitive capture media.

Verification:

• Ran ./gradlew app:assembleStandardDebug to confirm no build breakages.
• Ran ./gradlew app:testStandardDebugUnitTest to ensure tests continue to pass.

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PR created automatically by Jules for task 8423327602111708361 started by @yuga-hashimoto

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