Refactor Icon to SVG

[carlhemp]

I have refactored the "yCanta" icon from a complex structure of over 20 nested span elements and pseudo-elements into a single, high-quality inline SVG.

Key improvements:

• Quality & Smoothness: Letters and musical notes are now defined by precise SVG paths, resulting in smoother curves and a cleaner appearance.
• Performance: Reduced DOM complexity leads to faster paint times and fewer layout calculations.
• Maintainability: The code is now much cleaner and easier to understand, with a single <svg> element and simplified CSS.
• Functional Parity: All dynamic behaviors were preserved:
  • Scrolling: The icon still changes size and stroke thickness as you scroll, driven by your existing CSS variables.
  • Hovering: The stroke still thins and letters shift slightly when hovered.
  • Responsiveness: The "y-only" view still kicks in automatically when the icon is in a small container (e.g., on mobile headers).

I verified the implementation across all states using Playwright to ensure it perfectly matches the original's behavior while providing the requested "high quality" and efficiency.

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PR created automatically by Jules for task 9669172575987544186 started by @carlhemp

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