FCE-2747: Improve mobile-sdk docs about CallKit and Screen Sharing

[MiloszFilimowski]

Description

Improved docs to reflect actual state

[linear]

FCE-2747 Improve mobile-sdk docs about CallKit and Screen Sharing

[Copilot]

Pull request overview

Updates the React Native (mobile) documentation to better reflect the current state of background calls, CallKit usage, and Android permission/service requirements, while cleaning up outdated or duplicate guidance.

Changes:

• Removed a duplicate “background streaming during screen sharing” tip from the screen sharing guide.
• Updated Android installation permission guidance (including correcting MODIFY_AUDIO_SETTINGS) and removed permissions that are no longer required.
• Expanded/updated the “Background calls” doc with new Android AndroidManifest.xml foreground service configuration and CallKit hook examples for iOS.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
docs/how-to/client/screensharing.mdx	Removes duplicate background-streaming guidance from the screen sharing doc.
docs/how-to/client/migration-guide.mdx	Renames/repositions the 0.25.x migration guide and removes the CallKit hooks section.
docs/how-to/client/installation.mdx	Updates Android required-permissions list and fixes the MODIFY_AUDIO_SETTINGS typo in the manifest example.
docs/how-to/client/connecting.mdx	Renames the “Background Streaming” link label to “Background Calls”.
docs/how-to/client/background-streaming.mdx	Updates Android foreground service configuration and adds detailed iOS CallKit hook examples.

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