chore: update to Vite 8

Swaps the bundler to rolldown, so chunk layout changes but output does not.
Carries @sveltejs/vite-plugin-svelte 7, which is the release built for it.

frontend/package.json

@@ -22,7 +22,7 @@
 		"@lucide/svelte": "^0.544.0",
 		"@sveltejs/adapter-node": "^5.5.7",
 		"@sveltejs/kit": "^2.70.2",
-		"@sveltejs/vite-plugin-svelte": "^6.2.4",
+		"@sveltejs/vite-plugin-svelte": "^7.3.0",
 		"@tailwindcss/vite": "^4.3.3",
 		"@types/node": "^26.2.0",
 		"bits-ui": "^2.18.1",
@@ -45,7 +45,7 @@
 		"tw-animate-css": "^1.4.0",
 		"typescript": "^5.9.3",
 		"typescript-eslint": "^8.67.0",
-		"vite": "^7.3.6"
+		"vite": "^8.2.1"
 	},
 	"dependencies": {
 		"construct-style-sheets-polyfill": "^3.1.0",