Implement passkey login functionality and enhance passkey support checks

stores/auth.js

@@ -54,15 +54,21 @@ export const useAuthStore = defineStore('auth', {
       return response
     },
 
-    async passkeyLogin() {
+    async passkeyLogin(email = '') {
       // Client-only
-      if (typeof window === 'undefined' || !window.PublicKeyCredential) {
+      if (typeof window === 'undefined' || !window.PublicKeyCredential || !window.isSecureContext) {
         throw new Error('Passkeys werden von diesem Browser nicht unterstützt.')
       }
 
-      const { options } = await $fetch('/api/auth/passkeys/authentication-options', { method: 'POST' })
+      const normalizedEmail = String(email || '').trim().toLowerCase()
+
+      const { options } = await $fetch('/api/auth/passkeys/authentication-options', {
+        method: 'POST',
+        body: normalizedEmail ? { email: normalizedEmail } : {}
+      })
+
       const mod = await import('@simplewebauthn/browser')
-      const credential = await mod.startAuthentication(options)
+      const credential = await mod.startAuthentication({ optionsJSON: options })
 
       const response = await $fetch('/api/auth/passkeys/login', {
         method: 'POST',
@@ -83,7 +89,7 @@ export const useAuthStore = defineStore('auth', {
         this.user = null
         this.roles = []
         this.role = null
-      } catch (_error) {
+      } catch (error) {
         console.error('Logout fehlgeschlagen:', error)
         throw error
       }