Add favicon

[AJaccP]

🧠 Context

The current favicon is the Vite default — a generic Vite logo SVG at public/favicon.svg. index.html references it on line 5:

<link rel="icon" type="image/svg+xml" href="/favicon.svg" />

The replacement is the CCSS red and black logo SVG. Ask Jacc for the SVG file before starting.

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🛠️ Implementation Plan

1. Get the CCSS red and black logo SVG from Jacc

2. Replace public/favicon.svg with the provided SVG. The filename stays the same so index.html needs no changes.

3. Add a public/favicon.ico (for older browsers) and update index.html to include both:

   <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
   <link rel="alternate icon" href="/favicon.ico" />

4. Run pnpm dev and verify the new favicon appears in the browser tab. Hard-refresh (Cmd+Shift+R / Ctrl+Shift+R) if the old one is cached.

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✅ Acceptance Criteria

• Browser tab shows the CCSS logo instead of the Vite logo
• Favicon is visually legible at small sizes (16×16, 32×32)
• index.html still valid — no broken asset references