- The User-Agent field was not correctly loaded from the existing profile when opening the edit modal. (Fixes#650)
- Replaced the plain command text field with a dropdown listing built-in tools (FFmpeg, Streamlink, VLC, yt-dlp) plus a Custom option that reveals a free-text input. Each built-in now shows its default parameter string as a live example in the Parameters field description, updating as the command selection changes. Added descriptive help text to all fields to improve clarity.
- Replaced Formik with react-hook-form in Logo, M3UGroupFilter, M3UProfile, Stream, StreamProfile, and UserAgent components.
- Integrated Yup for schema validation in all updated forms.
- Updated form submission logic to accommodate new form handling methods.
- Adjusted state management and error handling to align with react-hook-form's API.
- Ensured compatibility with existing functionality while improving code readability and maintainability.
