fix(forms): unsichtbare Unicode-Zeichen in Eingaben strippen + FormCard-Rahmen

- cleanText(): Zero-Width-/Bidi-Marks/BOM (Copy-Paste aus iOS/WhatsApp)
  vor Validierung und im Payload entfernen — Telefonnummern mit
  U+202D/U+202C fielen sonst durch die Validierung
- FormCard.svelte: gerahmter Container, umschließt Kontakt- und
  Mitmachen-Formular

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/lib/components/blocks/InternalComponentBlock.svelte

@@ -3,6 +3,7 @@
   import type { InternalComponentBlockData } from "$lib/block-types";
   import ContactFormComponent from "$lib/components/internal/ContactFormComponent.svelte";
   import MitmachenFormComponent from "$lib/components/internal/MitmachenFormComponent.svelte";
+  import FormCard from "$lib/components/internal/FormCard.svelte";
 
   let { block }: { block: InternalComponentBlockData } = $props();
 
@@ -12,9 +13,13 @@
 
 <div class={layoutClasses} data-block="InternalComponent" data-block-type="internal_component" data-block-slug={block._slug}>
   {#if component === "form-contact"}
+    <FormCard>
       <ContactFormComponent />
+    </FormCard>
   {:else if component === "form-mitmachen"}
+    <FormCard>
       <MitmachenFormComponent />
+    </FormCard>
   {:else}
     <p class="text-sm text-stein-500">Unbekannte interne Komponente: <code>{component}</code></p>
   {/if}

src/lib/components/internal/FormCard.svelte

@@ -0,0 +1,27 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+
+  /** Gerahmter Container für interne Formulare (Kontakt, Mitmachen).
+   *  Optionaler Titel/Untertitel als Kopfzeile. */
+  let {
+    title = "",
+    subtitle = "",
+    children,
+  }: {
+    title?: string;
+    subtitle?: string;
+    children: Snippet;
+  } = $props();
+</script>
+
+<div class="rounded-lg border border-stein-200 bg-white p-5 shadow-sm md:p-7">
+  {#if title}
+    <div class="mb-4 border-b border-stein-200 pb-3">
+      <h2 class="text-base font-semibold text-stein-800">{title}</h2>
+      {#if subtitle}
+        <p class="mt-0.5 text-sm text-stein-500">{subtitle}</p>
+      {/if}
+    </div>
+  {/if}
+  {@render children()}
+</div>

src/lib/components/internal/mitmachen-form-validation.ts

@@ -52,8 +52,18 @@ const URL_RE = /\b(?:https?:\/\/|www\.)\S+/gi;
 const CONTROL_CHAR_RE = /[\x00-\x08\x0B\x0C\x0E-\x1F]/;
 const PHONE_RE = /^[0-9+()/\-.\s]*$/;
 
+/** Unsichtbare Format-Zeichen: Zero-Width, Bidi-Marks (U+202A–E), Word-Joiner,
+ *  BOM. Landen beim Kopieren aus iOS-Kontakten/WhatsApp in Telefonnummern und
+ *  lassen sonst die Validierung durchfallen. */
+const INVISIBLE_RE = /[\u200B-\u200F\u202A-\u202E\u2060-\u206F\uFEFF]/g;
+
+/** Entfernt unsichtbare Format-Zeichen + trimmt. Für Validierung UND Payload. */
+export function cleanText(s: unknown): string {
+  return typeof s === "string" ? s.replace(INVISIBLE_RE, "").trim() : "";
+}
+
 function trim(s: unknown): string {
-  return typeof s === "string" ? s.trim() : "";
+  return cleanText(s);
 }
 
 export function validateMitmachen(input: Partial<MitmachenFields>): MitmachenErrors {

src/routes/api/mitmachen/+server.ts

@@ -3,6 +3,7 @@ import { env as publicEnv } from "$env/dynamic/public";
 import { env as privateEnv } from "$env/dynamic/private";
 import type { RequestHandler } from "./$types";
 import {
+  cleanText,
   HONEYPOT_FIELDS,
   LIMITS,
   validateFiles,
@@ -108,12 +109,14 @@ export const POST: RequestHandler = async ({ request, getClientAddress }) => {
     ? `${cmsBase}/api/forms/mitmachen/submit-multipart?_environment=${encodeURIComponent(cmsEnv)}`
     : `${cmsBase}/api/forms/mitmachen/submit-multipart`;
 
+  // cleanText: unsichtbare Format-Zeichen (Bidi-Marks aus Copy-Paste) raus —
+  // gleiche Normalisierung wie in der Validierung.
   const payload = {
-    title: fields.title.trim(),
+    title: cleanText(fields.title),
-    description: fields.description.trim(),
+    description: cleanText(fields.description),
-    contact_name: fields.contactName.trim(),
+    contact_name: cleanText(fields.contactName),
-    phone: fields.phone.trim(),
+    phone: cleanText(fields.phone),
-    email: fields.email.trim(),
+    email: cleanText(fields.email),
     consent_at: new Date().toISOString(),
     submitted_via: "windwiderstand.de/api/mitmachen",
     user_agent: (request.headers.get("user-agent") ?? "").slice(0, 200),