Fix build: remove deleted package imports from globals.css

tw-animate-css, shadcn, @tailwindcss/typography were removed in F008
but their @import/@plugin lines remained in globals.css, breaking the build.
CSS variables are defined inline so none of these imports are needed.

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

src/app/globals.css

@@ -1,7 +1,4 @@
 @import "tailwindcss";
-@import "tw-animate-css";
-@import "shadcn/tailwind.css";
-@plugin "@tailwindcss/typography";
 
 @custom-variant dark (&:is(.dark *));