fix: eliminate all TypeScript any usage across Vue components

Replace 24 `err: any` error handler types with proper `AxiosError<ApiErrorResponse>`
typing. Fix additional `as any` casts and `Record<string, any>` patterns in registration
field components, event settings, and portal layout. Create shared `ApiErrorResponse`
type for portal app.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/portal/src/pages/profiel.vue

@@ -7,6 +7,8 @@ import { apiClient } from '@/lib/axios'
 import MfaTotpSetupDialog from '@/components/settings/MfaTotpSetupDialog.vue'
 import MfaEmailSetupDialog from '@/components/settings/MfaEmailSetupDialog.vue'
 import MfaDisableDialog from '@/components/settings/MfaDisableDialog.vue'
+import axios from 'axios'
+import type { ApiErrorResponse } from '@/types/api'
 
 definePage({
   name: 'portal-profiel',
@@ -199,14 +201,19 @@ async function saveProfile() {
     snackbarColor.value = 'success'
     snackbar.value = true
   }
-  catch (err: any) {
-    const data = err?.response?.data
-    if (data?.errors) {
-      const firstError = Object.values(data.errors).flat()[0] as string
-      profileError.value = firstError
+  catch (err: unknown) {
+    if (axios.isAxiosError<ApiErrorResponse>(err)) {
+      const data = err.response?.data
+      if (data?.errors) {
+        const firstError = Object.values(data.errors).flat()[0]
+        profileError.value = firstError ?? 'Er is een fout opgetreden.'
+      }
+      else {
+        profileError.value = data?.message ?? 'Er is een fout opgetreden.'
+      }
     }
     else {
-      profileError.value = data?.message ?? 'Er is een fout opgetreden.'
+      profileError.value = 'Er is een fout opgetreden.'
     }
   }
 }
@@ -228,16 +235,21 @@ async function savePassword() {
     snackbarColor.value = 'success'
     snackbar.value = true
   }
-  catch (err: any) {
-    const data = err?.response?.data
-    if (data?.errors) {
-      passwordFieldErrors.value = {}
-      for (const [key, messages] of Object.entries(data.errors)) {
-        passwordFieldErrors.value[key] = (messages as string[])[0]
+  catch (err: unknown) {
+    if (axios.isAxiosError<ApiErrorResponse>(err)) {
+      const data = err.response?.data
+      if (data?.errors) {
+        passwordFieldErrors.value = {}
+        for (const [key, messages] of Object.entries(data.errors)) {
+          passwordFieldErrors.value[key] = messages[0]
+        }
+      }
+      else {
+        passwordError.value = data?.message ?? 'Er is een fout opgetreden.'
       }
     }
     else {
-      passwordError.value = data?.message ?? 'Er is een fout opgetreden.'
+      passwordError.value = 'Er is een fout opgetreden.'
     }
   }
 }