[FEAT] Sidebar Svelte Favicon Support

[stickerdaniel]

Feat: Svelte favicon support

Svelte/SvelteKit projects in the sidebar don’t resolve their real project favicon and fall back to a generic folder icon. The sidebar favicon loading also needs to avoid layout shift and cached-image race conditions.

Implementation Prompt

Implement Svelte/SvelteKit sidebar project favicon support in t3code by extending /api/project-favicon server--side. Resolve icons in this order: real favicon files, parsed icon links (including src/app.html and %sveltekit.assets%/..• → static/... ), then Svelte fallback, then generic fallback. Detect Svelte only from strong root markers in projectIconFallback.ts: svelte.config.*, •svelte-kit/, or package. json deps containing svelte / @sveltejs/kit .

Serve fallback icons from checked-in asset files:

• apps/server/src/assets/project-favicon-default.svg
• apps/server/src/assets/project-favicon-svelte.svg

Add a helper to load those SVGs and update the server build script so they are copied into dist/assets

Update tests in apps/server/src/projectFaviconRoute.test.ts to cover real favicon resolution, SvelteKit %sveltekit. assets% resolution, Svelte fallback detection, precedence rules, and generic fallback, asserting against
asset-backed SVG constants.

Also fix sidebar layout shift in apps/web/src/components/Sidebar.tsx: reserve a fixed icon slot, show nothing while
loading, pop the favicon in immediately on success, and keep showing the folder icon only on error. Validate with bun lint and bun typecheck

Before	After

[stickerdaniel]

Pr #515