fix(react-native): restore screen wake lock and proximity sensing

[oliverlaz]

💡 Overview

When we migrated away from InCallManager (#1840) to our in-house callManager, we didn't port the Wake Lock on iOS and proximity sensing on both Android and iOS.
This PR closes that gap.

🎫 Ticket: https://linear.app/stream/issue/RN-291/screen-auto-lock

[Copilot]

Pull Request Overview

This PR restores screen wake lock and proximity sensing functionality that was lost during the migration from InCallManager to the custom callManager implementation. The changes ensure the device screen stays on during calls and the proximity sensor automatically turns off the screen when held near the ear (earpiece mode only).

Key Changes:

• Added screen wake lock on iOS to prevent screen dimming during calls
• Implemented proximity sensor monitoring on both iOS and Android to turn off screen when device is near ear
• Integrated proximity management into the call lifecycle via callManager.start() and callManager.stop()

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

File	Description
sample-apps/react-native/dogfood/src/navigators/Call.tsx	Integrated callManager.start() and callManager.stop() calls in the dogfood app to enable wake lock and proximity sensing
packages/react-native-sdk/ios/StreamInCallManager.swift	Added wake lock, proximity monitoring, and audio route observation on iOS
packages/react-native-sdk/android/src/main/java/com/streamvideo/reactnative/callmanager/StreamInCallManagerModule.kt	Integrated ProximityManager into Android call manager lifecycle
packages/react-native-sdk/android/src/main/java/com/streamvideo/reactnative/callmanager/ProximityManager.kt	New Android proximity manager implementation handling sensor registration and wake lock management

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