Tests HTML <input type="file"> and Wails Dialog API functionality (#4862).
Test Cases
HTML File Input:
Single File - Basic file selection
Multiple Files - Multi-select with multiple attribute
Files or Directories - Selection with webkitdirectory attribute
Wails Dialog API (via generated bindings):
4. Directory Only - CanChooseDirectories(true) + CanChooseFiles(false)
5. Filtered (.txt) - Using AddFilter() for file type filtering
Run
# Generate bindings (already included)
wails3 generate bindings -d assets/bindings
# Run the app
go run .