frontend:add:error handling on failed validation

frontend/src/routes/auth/about/[id]/+page.svelte

@@ -9,6 +9,7 @@
   import { page } from "$app/stores";
   import { receive, send } from "$lib/utils/helpers";
   import { t } from "svelte-i18n";
+  import { fly } from "svelte/transition";
 
   $: ({ user } = $page.data);
 
@@ -19,33 +20,19 @@
   /** @type{Avatar[]} */
   let avatars = [];
 
-  /**
-   * @typedef {Object} FormData
-   * @property {string} first_name
-   * @property {string} last_name
-   * @property {string} email
-   * @property {string} [password]
-   * @property {string} [password2]
-   * @property {string} [phone]
-   * @property {string} address
-   * @property {string} zip_code
-   * @property {string} city
-   */
-  /**
-   * @typedef {Object.<string, string>} ValidationErrors
-   */
-  /**
-   * @type {ValidationErrors}
-   */
-  let validationErrors = {};
-
   const TABS = ["profile", "membership", "bankaccount"];
   let activeTab = TABS[0];
 
+  /** @type{string[]} */
+  let errorMessages = [];
+
   let showModal = false,
     isUploading = false,
     isUpdating = false,
-    showAvatars = false;
+    showAvatars = false,
+    password = "",
+    password2 = "";
+
   const open = () => (showModal = true);
   const close = () => (showModal = false);
   const toggleAvatars = () => (showAvatars = !showAvatars);
@@ -84,62 +71,30 @@
     activeTab = tab;
   }
 
-  /**
-   * Validates thek form data
-   * @param {Object} data - The form data to validate
-   * @returns {ValidationErrors} An object containing validation errors
-   */
-  function validateForm(data) {
-    /** @type {ValidationErrors} */
-    let errors = {};
-
-    if ("first_name" in data && !String(data.first_name).trim()) {
-      errors.first_name = $t("required");
-    }
-    if ("last_name" in data && !String(data.last_name).trim()) {
-      errors.last_name = $t("required");
-    }
-    if (
-      "email" in data &&
-      (!data.email || !/^\S+@\S+\.\S+$/.test(String(data.email)))
-    ) {
-      errors.email = $t("required");
-    }
-    if ("password" in data) {
-      if (String(data.password).length < 8) {
-        errors.password = $t("required_password");
-      }
-      if ("password2" in data && data.password !== data.password2) {
-        errors.password2 = $t("required_password_match");
-      }
-    }
-
-    return errors;
-  }
-
   /** @type {import('./$types').SubmitFunction} */
   const handleUpdate = async ({ form, formData, action, cancel }) => {
-    /** @type {Object.<string, FormDataEntryValue>} */
-    const fd = Object.fromEntries(formData);
-    validationErrors = validateForm(fd);
-    if (Object.keys(validationErrors).length > 0) {
+    errorMessages = [];
+    const errorElements = form.querySelectorAll(".error-message");
+
+    errorElements.forEach((element) => {
+      if (element.textContent) {
+        errorMessages.push(element.textContent);
+      }
+    });
+
+    if (errorMessages.length > 0) {
       cancel();
       return;
     }
 
+    errorMessages = [];
     isUpdating = true;
     return async ({ result }) => {
       isUpdating = false;
       if (result.type === "success" || result.type === "redirect") {
-        validationErrors = {};
         close();
       } else if (result.type == "failure" && result.data?.errors) {
-        /** @type {ValidationErrors} */
-        validationErrors = {};
-        // Assuming result.data.errors is an array of {error: string, id: string}
-        result.data.errors.forEach(({ error, id }) => {
-          validationErrors[id] = error;
-        });
+        errorMessages = result.data.errors.map((error) => error.error);
       }
       await applyAction(result);
     };
@@ -345,12 +300,16 @@
             type="password"
             label={$t("password")}
             placeholder={$t("placeholder_password")}
+            bind:value={password}
+            otherPasswordValue={password2}
           />
           <InputField
             name="password2"
             type="password"
             label={$t("password_repeat")}
             placeholder={$t("placeholder_password")}
+            bind:value={password2}
+            otherPasswordValue={password}
           />
           <InputField
             name="first_name"
@@ -452,12 +411,14 @@
             label={$t("iban")}
             value={user.bank_account?.iban || ""}
             placeholder={$t("placeholder_iban")}
+            toUpperCase={true}
           />
           <InputField
             name="bic"
             label={$t("bic")}
             value={user.bank_account?.bic || ""}
             placeholder={$t("placeholder_bic")}
+            toUpperCase={true}
           />
           <InputField
             name="mandate_reference"
@@ -467,6 +428,15 @@
           />
         </div>
       {/if}
+      {#if errorMessages.length > 0}
+        <div class="error-container">
+          {#each errorMessages as message, i (i)}
+            <p class="error-message" transition:fly={{ y: -20, duration: 300 }}>
+              {message}
+            </p>
+          {/each}
+        </div>
+      {/if}
       <div class="button-container">
         {#if isUpdating}
           <SmallLoader width={30} message={"Aktualisiere..."} />
@@ -482,6 +452,19 @@
 {/if}
 
 <style>
+  .error-container {
+    background-color: #fee2e2;
+    border: 1px solid #f87171;
+    border-radius: 4px;
+    padding: 1rem;
+    margin-bottom: 1rem;
+  }
+
+  .error-message {
+    color: #dc2626;
+    margin: 0.5rem 0;
+    font-size: 0.9rem;
+  }
   .tab-content {
     padding: 1rem;
     border-radius: 0 0 3px 3px;