Fix iOS microphone crash

[shannonchou]

Purpose

• fix iOS crash when use microphone
• disable dark mode, otherwise we can't see the buttons

Pull Request Type

What kind of change does this Pull Request introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

[shannonchou]

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