Remove toggleMicrophoneMute from mobile

[anna1901]

Description

Remove toggleMicrophoneMute from mobile as it's not needed.

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-2631 Delete `toggleMicrophoneMute()` from mobile sdk

[Copilot]

Pull request overview

This PR removes the toggleMicrophoneMute method from the mobile client's useMicrophone hook by using TypeScript's Omit utility type to exclude it from the return type. This change aligns with the pattern used elsewhere in the codebase where certain features are not supported on mobile platforms.

Changes:

• Import useMicrophone from @fishjam-cloud/react-client with an alias
• Remove useMicrophone from the direct re-export list
• Create a custom export that omits the toggleMicrophoneMute method from the return type

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