FCE-2803: Add permissions helpers

[MiloszFilimowski]

Description

Add useCameraPermissions and useMicrophonePermissions hooks to @fishjam-cloud/react-native-client for querying and requesting camera/microphone permissions. Patch getUserMedia to log warnings when called without granted permissions.

Update the example app (fishjam-chat) to request permissions before initializing devices and show an "Open Settings" fallback when permissions are denied.

Motivation and Context

There was no built-in way for consumers of the mobile SDK to check or request media permissions. Developers had to wire up platform-specific permission logic themselves. This also meant getUserMedia could silently fail when permissions were missing.

Documentation impact

• Documentation update required
• Documentation updated in another PR
• [] No documentation update required

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)

[linear]

FCE-2803 Add permissions helpers

[Copilot]

Pull request overview

Adds permission-related helpers to the React Native mobile client, including runtime warnings around getUserMedia permission state and new exported hooks for querying/requesting camera/microphone access. Updates the example app to request permissions up front and route users to OS settings when denied.

Changes:

• Patch navigator.mediaDevices.getUserMedia to log warnings when camera/mic permissions aren’t granted.
• Add useCameraPermissions / useMicrophonePermissions hooks to the mobile-client public API.
• Update the fishjam-chat example preview flow to request permissions and show an “Open Settings” fallback.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/mobile-client/src/webrtc-polyfill.ts	Registers a new getUserMedia patch during globals setup.
packages/mobile-client/src/overrides/getUserMedia.ts	Implements the permission-status warning wrapper around getUserMedia.
packages/mobile-client/src/index.ts	Exports new permission hooks from the package entrypoint.
packages/mobile-client/src/hooks/usePermissions.ts	Adds hooks for querying/requesting camera/microphone permissions.
examples/mobile-client/fishjam-chat/hooks/useMediaPermissions.ts	New example hook to request media permissions and expose settings navigation.
examples/mobile-client/fishjam-chat/app/room/preview.tsx	Integrates the new permissions flow into the preview screen UI/initialization.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

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