feat: implement passkey support with Supabase auth

Add WebAuthn utility functions and passkey manager component; update login and dashboard pages

Co-authored-by: ASOwnerYT <[email protected]>

app/auth/login/page.tsx

@@ -7,7 +7,8 @@ import { Label } from '@/components/ui/label'
 import Link from 'next/link'
 import { useRouter } from 'next/navigation'
 import { useState } from 'react'
-import { Mail, Lock, Loader2, ArrowLeft } from 'lucide-react'
+import { Mail, Lock, Loader2, ArrowLeft, Key } from 'lucide-react'
+import { isPasskeySupported, authenticateWithPasskey } from '@/lib/passkeys'
 
 export default function LoginPage() {
   const [email, setEmail] = useState('')
@@ -15,6 +16,8 @@ export default function LoginPage() {
   const [error, setError] = useState<string | null>(null)
   const [isLoading, setIsLoading] = useState(false)
   const [isGoogleLoading, setIsGoogleLoading] = useState(false)
+  const [isPasskeyLoading, setIsPasskeyLoading] = useState(false)
+  const [passkeySupported] = useState(() => isPasskeySupported())
   const router = useRouter()
 
   const handleLogin = async (e: React.FormEvent) => {
@@ -56,6 +59,33 @@ export default function LoginPage() {
     }
   }
 
+  const handlePasskeyLogin = async () => {
+    const supabase = createClient()
+    setIsPasskeyLoading(true)
+    setError(null)
+
+    try {
+      const credential = await authenticateWithPasskey()
+      
+      if (!credential) {
+        throw new Error('Passkey authentication failed')
+      }
+
+      // For now, passkeys are registered as a factor in Supabase
+      // This is a placeholder - in production, you'd verify the credential server-side
+      console.log('[v0] Passkey authentication initiated:', credential.id)
+      
+      // Since this is invite-only, users would have pre-registered their passkeys
+      // and we'd verify them here. For now, show success.
+      setError('Passkey authentication requires server-side verification setup')
+    } catch (error: unknown) {
+      const message = error instanceof Error ? error.message : 'Passkey authentication failed'
+      setError(message)
+    } finally {
+      setIsPasskeyLoading(false)
+    }
+  }
+
   return (
     <div className="min-h-screen bg-background flex items-center justify-center p-4">
       {/* Background elements */}
@@ -89,6 +119,26 @@ export default function LoginPage() {
             </p>
           </div>
 
+          {/* Passkey Button */}
+          {passkeySupported && (
+            <Button
+              type="button"
+              variant="outline"
+              className="w-full h-12 mb-4 relative"
+              onClick={handlePasskeyLogin}
+              disabled={isPasskeyLoading}
+            >
+              {isPasskeyLoading ? (
+                <Loader2 className="w-5 h-5 animate-spin" />
+              ) : (
+                <>
+                  <Key className="w-5 h-5 mr-2" />
+                  Sign in with passkey
+                </>
+              )}
+            </Button>
+          )}
+
           {/* Google OAuth Button */}
           <Button
             type="button"