[GUI] Build Config Editor page

[Weidows]

Description

Build the Config Editor page for visually editing the wutils configuration.

Tasks

• Parse wutils.yml and render as a form with sections:
  • App: name, version, debug mode (toggle)
  • Logging: level (dropdown), format (dropdown)
  • Refresh: interval (number input)
  • DSG: parallel (toggle), disks (tag input), delay (number)
  • OL: parallel (toggle), delay (number), patterns (editable table)
  • Buffer: enable (toggle), memory_limit (slider), flush_interval, strategy (dropdown)
• Each field shows its description as tooltip (from YAML comments)
• "Save" button persists to ~/.config/wutils/app.yml
• "Reset to Defaults" button
• "Export" / "Import" buttons for config file
• Validation: show inline errors for invalid values
• Raw YAML editor mode (advanced users, syntax highlighted textarea)
• Unsaved changes warning before navigating away
• Hot-reload: if config changes on disk (external edit), show reload prompt

Acceptance Criteria

• All config fields render correctly with current values
• Save writes valid YAML that wutils config cat can read
• Reset to defaults works
• Validation prevents invalid values (e.g., negative intervals)