fix(react): scan all plugin src for Tailwind, not just src/react

The Tailwind v4 @source globs only scanned plugin UI under
plugins/*/src/react/**. The toolkits plugin keeps its UI directly in
src/ (page.tsx, client.tsx), so those files were never scanned and any
utility class used only there was dropped from the generated CSS.

The Toolkits content header uses min-h-12 (used nowhere else), so it was
never generated: the header lost its 48px floor and collapsed to ~36px
while the h-12 sidebar header stayed 48px, leaving the two header bottom
borders misaligned. min-h-36 and space-y-7 were dropped the same way
(min-h-36 was only masked by an inline minHeight fallback on the card).

Widen the glob to plugins/*/src/** so all plugin UI is scanned,
regardless of whether it lives under src/react. Also covers the
desktop-settings and example plugins, which have the same layout.

Author: RhysSullivan

packages/react/src/styles/globals.css

@@ -5,7 +5,7 @@
 @source "../**/*.{ts,tsx}";
 @source "../../../../apps/local/src/**/*.{ts,tsx}";
 @source "../../../../apps/cloud/src/**/*.{ts,tsx}";
-@source "../../../plugins/*/src/react/**/*.{ts,tsx}";
+@source "../../../plugins/*/src/**/*.{ts,tsx}";
 
 @theme inline {
   --font-sans: "Inter", ui-sans-serif, system-ui, sans-serif;