* fix(app): clear mobile composer input on submit
Submitting a prompt on mobile failed to clear the native text input because EditingTextInput.replaceText previously only called setNativeProps({ text }), which is ignored on Fabric and PasteTextInput.
Fix this by:
- Delegating replaceText in EditingTextInputNative to inputRef.current.replaceText when available, clearing via clear() when text is empty, and falling back to setNativeProps.
- Patching @mattermost/react-native-paste-input to expose replaceText(text, selection) backed by native Commands.setTextAndSelection, updating clear() to use live event counts, and preventing useImperativeHandle closures over null refs during initial mount.
- Registering the patch in scripts/postinstall-patches.mjs and adding unit tests for native text input replacement and clearing.
* fix: update nix npm dependency hash
