Remove dead CSS: delete unused compact-widgets.css, deduplicate globals.css

- Delete compact-widgets.css (378 lines, never imported anywhere)
- Remove duplicate singleNoteWidget block in globals.css (exact copy-paste)

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

next-env.d.ts

@@ -1,6 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
-import "./.next/dev/types/routes.d.ts";
+import "./.next/types/routes.d.ts";
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/app/api-reference/config/typescript for more information.