Fix Tremor chart colors: add @source for Tailwind v4 to scan Tremor classes

Tremor generates Tailwind utility classes dynamically (fill-blue-500,
bg-emerald-500, etc). Tailwind v4 auto-content detection doesn't scan
node_modules, so these classes were missing from CSS output, causing
all charts to render in black.

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

src/app/globals.css

@@ -43,6 +43,10 @@
 /* Source the JS config for extended theme values */
 @config "../../tailwind.config.ts";
 
+/* Tremor generates Tailwind utility classes dynamically (fill-blue-500, bg-emerald-500, etc.)
+   Tailwind v4 needs to scan Tremor's compiled JS to include them in the output. */
+@source "../../node_modules/@tremor/react/dist/**/*.js";
+
 /* Theme variables - using CSS custom properties with Tailwind v4 @theme */
 @theme {
   /* Container */