🛡️ Sentinel: Fix insecure temp file creation

[yuga-hashimoto]

🛡️ Sentinel: Fix insecure temp file creation

What
Modified File.createTempFile() invocations across CameraCaptureManager and ScreenRecordManager to explicitly pass context.cacheDir as the directory argument.

Why
By default, File.createTempFile on Android uses java.io.tmpdir which can be unpredictable or point to globally readable storage depending on the OS version and environment. Explicitly setting context.cacheDir enforces the use of the app's internal /data/data/<pkg>/cache directory, securing potentially sensitive screen recordings and camera snapshots from other applications. This also resolves related CodeQL local temp-file disclosure findings.

Validation

• app:assembleStandardDebug succeeds locally.
• Tests pass via ./gradlew app:testStandardDebugUnitTest.

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PR created automatically by Jules for task 9965616837186747191 started by @yuga-hashimoto

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