Refactor icon system with Material Symbols and unified IconData

[guiyanakuang]

Summary

Refactor the icon system to use Material Symbols instead of Material Icons, and introduce a unified IconData class for consistent icon styling across the app.

Changes

• Add icons.material.symbols.rounded dependency
• Create IconData class with predefined color palettes (Amber, Blue, Cyan, Green, etc.)
• Migrate PasteTypeExt to use IconData with Material Symbols icons
• Simplify SVG icons (html, image, link, text)
• Update Settings views to use the new IconData system