Refactor: minor improvements to the WebUI

[arabcoders]

This pull request introduces a new security feature to strip dangerous yt-dlp options when configured, improves documentation and project messaging, and enhances the UI with more consistent select components and optional page transition animations. The changes are grouped into backend security/configuration, documentation, and UI/UX improvements.

Backend: Security and Configuration

• Added a new config option YTP_DISABLE_EXEC disabled by default to strip potentially dangerous yt-dlp options at runtime for improved security in unauthenticated deployments.
• Updated FAQ.md to document the new YTP_DISABLE_EXEC option and its use case for reducing risk in unauthenticated environments.

UI/UX Improvements

• Replaced all instances of USelect with USelectMenu for select components across the UI, adding search functionality.
• Added a user setting and implementation for toggling page transition animations.
• Improved card border consistency across various components and pages for a more unified look.