Fix Vercel deploy: set output directory to build

Remove explicit adapter-static options for zero-config Vercel detection
and add vercel.json to point Vercel at the build output directory.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: lightsofapollo

site/svelte.config.js

@@ -3,13 +3,7 @@ import adapter from '@sveltejs/adapter-static';
 /** @type {import('@sveltejs/kit').Config} */
 const config = {
 	kit: {
-		adapter: adapter({
-			pages: 'build',
-			assets: 'build',
-			fallback: undefined,
-			precompress: false,
-			strict: true
-		}),
+		adapter: adapter(),
 	}
 };
 

site/vercel.json

@@ -0,0 +1,3 @@
+{
+	"outputDirectory": "build"
+}