Add visible debug toast showing pubkey returned by Amber after login

Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>

src/components/auth/LoginDialog.tsx

@@ -60,6 +60,12 @@ export const LoginDialog: React.FC<LoginDialogProps> = ({ isOpen, onClose, onLog
       try {
         // This opens Amber natively, user approves, pubkey comes back as a Promise
         const pubkey = await getAmberPublicKeyViaPlugin();
+        // DEBUG: show pubkey on screen so we can verify it's correct
+        toast({
+          title: '🔑 DEBUG: Amber returned',
+          description: `hex: ${pubkey.slice(0, 16)}... (${pubkey.length} chars)`,
+          duration: 10000,
+        });
         completeAmberLogin(pubkey);
       } catch (e: unknown) {
         const msg = (e as Error)?.message ?? 'Amber login failed';