On iOS devices, when the keyboard is open, there's a home indicator bar
(approximately 34px tall) at the bottom of the keyboard that needs additional
safe area padding.
Changes:
- Add --oc-keyboard-home-indicator CSS variable
- Add ios-keyboard-safe-area class for keyboard open state
- Detect iOS userAgent and set keyboard home indicator height
- Apply ios-keyboard-safe-area class to ChatInput when keyboard is open
Co-authored-by: Jovines <jovines@qq.com>
