fix(themes): Add dark invert style to provider icons in shadcn theme (#6375)

Author: alexcarpenter

.changeset/stupid-roses-call.md

@@ -0,0 +1,5 @@
+---
+'@clerk/themes': patch
+---
+
+Fix shadcn theme provider icon rendering in dark mode for Apple, GitHub, and OKX Wallet.

packages/themes/src/themes/shadcn.ts

@@ -31,5 +31,8 @@ export const shadcn = experimental_createTheme({
         display: 'none',
       },
     },
+    providerIcon__apple: 'dark:invert',
+    providerIcon__github: 'dark:invert',
+    providerIcon__okx_wallet: 'dark:invert',
   },
 });