feat: update SVG favicon with gradient design (closes #103)

[iammissmiller]

Closes #103

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📖 What does this PR do?

This PR adds a custom favicon.svg to the Webify project, replacing the default blank browser tab icon with a polished, on-brand SVG favicon. The design features a floating < /> code symbol with a blue→purple gradient — matching the clean, modern aesthetic of the Webify UI.

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🎨 Design Decisions

• Floating symbol — no background box or border, keeping it minimal and sharp
• Blue → Purple gradient on the brackets with an indigo → magenta slash for subtle depth
• SVG format — infinitely scalable, renders crisply at all sizes (16px, 32px, 64px, 256px)
• Visible on both light and dark browser themes — gradient pops on any tab strip color
• Matches the purple accent color already used throughout the Webify interface

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🔧 Changes Made

File	Change
public/favicon.svg	Added new custom SVG favicon
app/layout.tsx	Added icons field to metadata export to link the favicon

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📸 Screenshots

Browser Tab

Favicon at Different Sizes

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🧪 How to Test

1. Clone the branch and run npm run dev
2. Open http://localhost:3000 in your browser
3. Check the browser tab — the < /> gradient favicon should appear
4. Bookmark the page and verify it shows correctly in the bookmarks bar
5. Test on both light and dark browser themes

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🏷️ Request to Maintainers

Hey maintainers! 👋 This was a design-heavy issue requiring multiple iterations to match the Webify aesthetic. I'd really appreciate a generous label for the points — worked hard to get the favicon looking just right! 🙏

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📎 Related Issue

Resolves #103 — Feature Request: Add SVG Favicon for Better Branding & Professional Browser Experience

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