Merge pull request #501 from erzabytyci/user-tiers

Fix Click function and add rich editor, fix editor, improve Gap edit functionality

gradesa/data/migrations/00043_add_source_html_to_click_exercises.sql

@@ -0,0 +1,2 @@
+ALTER TABLE public.click_exercises
+ADD COLUMN IF NOT EXISTS source_html text;

gradesa/data/schema.sql

@@ -85,7 +85,8 @@ CREATE TABLE public.click_exercises (
   title text NOT NULL,
   category text NOT NULL,
   target_words text[] NOT NULL,
-  all_words text[] NOT NULL
+  all_words text[] NOT NULL,
+  source_html text
 );
 
 ALTER TABLE public.click_exercises

gradesa/schema.sql

@@ -50,7 +50,8 @@ CREATE TABLE public.click_exercises (
   title text NOT NULL,
   category text NOT NULL,
   target_words text[] NOT NULL,
-  all_words text[] NOT NULL
+  all_words text[] NOT NULL,
+  source_html text
 );
 
 ALTER TABLE public.click_exercises

gradesa/src/app/admin/create-exercise/click/click.css

@@ -1,10 +1,38 @@
+.click-admin-page {
+    max-width: 960px;
+}
+
+.click-form {
+    display: grid;
+    gap: var(--u-md);
+}
+
 .exercise-click {
-    display: flex;
+    display: block;
-    justify-content: space-between;
+}
+
+.click-block {
+    padding: var(--u-md);
+    border: 1px solid var(--bg3);
+    border-radius: var(--u-sm);
+    background: var(--bg2);
+}
+
+.click-block label {
+    display: block;
+    margin-bottom: var(--u-xs);
+    color: var(--fg2);
+    font-weight: 600;
 }
 
 .click-input {
-    width: 60%;
+    width: 100%;
+    font: inherit;
+}
+
+.click-form-actions {
+    display: flex;
+    justify-content: flex-start;
 }
 
 .error-message {

gradesa/src/app/admin/create-exercise/click/page.js

@@ -8,6 +8,17 @@ import { Button } from "@/components/ui/button";
 import useQuery from "@/shared/hooks/useQuery";
 import "./click.css";
 import WordSelectionExercise from "@/components/ui/click/click.js";
+import Editor from "@/components/ui/editor";
+import { htmlToPlainText } from "@/shared/utils/normalizeEditorText";
+
+function escapeHtml(value) {
+  return String(value || "")
+    .replace(/&/g, "&")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/\"/g, "&quot;")
+    .replace(/'/g, "&#39;");
+}
 
 export default function CreateExercise() {
   const router = useRouter();
@@ -18,6 +29,7 @@ export default function CreateExercise() {
   const [error, setError] = useState(null);
   const [title, setTitle] = useState("");
   const [targetCategory, setTargetCategory] = useState("");
+  const [allWordsHtml, setAllWordsHtml] = useState("");
   const [allWordsText, setAllWordsText] = useState("");
   const [selectedWords, setSelectedWords] = useState([]);
   const [previewMode, setPreviewMode] = useState(false);
@@ -45,15 +57,27 @@ export default function CreateExercise() {
     const text = hasExplicitSpacing
       ? storedWords.join("")
       : storedWords.join(" ");
+    const sourceHtml =
+      typeof exerciseData.source_html === "string"
+        ? exerciseData.source_html
+        : text
+          ? `<p>${escapeHtml(text)}</p>`
+          : "";
 
     setTitle(exerciseData.title || "");
     setTargetCategory(exerciseData.category || "");
+    setAllWordsHtml(sourceHtml);
     setAllWordsText(text);
     setSelectedWords(
       Array.isArray(exerciseData.target_words) ? exerciseData.target_words : []
     );
   }, [exerciseData, isEditMode]);
 
+  const handleEditorContentChange = (html) => {
+    setAllWordsHtml(html);
+    setAllWordsText(htmlToPlainText(html));
+  };
+
   // Preserve user-entered spacing and line breaks so preview and saved exercise match.
   const allWords =
     allWordsText.replace(/\r\n/g, "\n").match(/[^\S\n]+|\n|[^\s]+/g) ?? [];
@@ -74,6 +98,7 @@ export default function CreateExercise() {
             targetCategory,
             targetWords: selectedWords,
             allWords,
+            sourceHtml: allWordsHtml,
           }),
         });
 
@@ -87,6 +112,7 @@ export default function CreateExercise() {
           targetCategory,
           targetWords: selectedWords,
           allWords,
+          sourceHtml: allWordsHtml,
         });
 
         setSubmitted(true);
@@ -139,7 +165,7 @@ export default function CreateExercise() {
   }
 
   return (
-    <div>
+    <div className="click-admin-page">
       <h1>
         {isEditMode
           ? "Wortauswahl-Übung bearbeiten"
@@ -148,9 +174,9 @@ export default function CreateExercise() {
       {submitted ? (
         successMessage() // Show only the success message if submitted
       ) : !previewMode ? (
-        <form onSubmit={handlePreview}>
+        <form onSubmit={handlePreview} className="click-form">
           <Column gap="md">
-            <Container className="exercise-click">
+            <Container className="exercise-click click-block">
               <label>Übungstitel</label>
               <input
                 className="click-input"
@@ -162,7 +188,7 @@ export default function CreateExercise() {
               />
             </Container>
 
-            <Container className="exercise-click">
+            <Container className="exercise-click click-block">
               <label>Zielkategorie</label>
               <input
                 className="click-input"
@@ -174,21 +200,20 @@ export default function CreateExercise() {
               />
             </Container>
 
-            <Container className="exercise-click">
+            <Container className="exercise-click click-block">
               <label>Übungstext</label>
-              <textarea
+              <Editor
-                className="click-input"
+                key="click-editor"
-                value={allWordsText}
+                defaultContent={allWordsHtml}
-                onChange={(e) => setAllWordsText(e.target.value)}
+                updateEditorContent={handleEditorContentChange}
-                placeholder="Z. B. Ich mag laufen und schwimmen."
-                rows={4}
-                required
               />
             </Container>
           </Column>
-          <Button size="md" type="submit">
+          <Container className="click-form-actions">
-            Zielwörter auswählen
+            <Button size="md" type="submit">
-          </Button>
+              Zielwörter auswählen
+            </Button>
+          </Container>
         </form>
       ) : (
         <div>
@@ -205,6 +230,7 @@ export default function CreateExercise() {
               targetCategory={targetCategory}
               targetWords={selectedWords}
               allWords={allWords}
+              sourceHtml={allWordsHtml}
               isPreviewMode={true}
               onSelectionChange={(updatedSelectedWords) =>
                 setSelectedWords(updatedSelectedWords)

gradesa/src/app/admin/create-exercise/fillinthegap/fillinthegap.css

@@ -53,6 +53,22 @@
   background: var(--bg1);
 }
 
+.fitg-gap-remove {
+  border: 1px solid var(--tertiary2);
+  background: transparent;
+  color: var(--tertiary2);
+  border-radius: 999px;
+  width: 1.75rem;
+  height: 1.75rem;
+  cursor: pointer;
+  font-weight: 700;
+  line-height: 1;
+}
+
+.fitg-gap-remove:hover {
+  background: var(--tertiary1);
+}
+
 .fitg-answer-row {
   border: 1px dashed var(--bg4);
   border-radius: var(--u-xs);
@@ -65,4 +81,4 @@
   border: 1px solid var(--tertiary2);
   padding: var(--u-sm);
   border-radius: var(--u-xs);
-}
+}

gradesa/src/app/admin/create-exercise/fillinthegap/page.js

@@ -35,6 +35,75 @@ function createDefaultAnswers() {
   ];
 }
 
+function normalizeTokenKey(value) {
+  return String(value || "")
+    .trim()
+    .toLowerCase();
+}
+
+function takeClosestIndex(indices, targetIndex) {
+  if (!indices.length) {
+    return undefined;
+  }
+
+  let bestArrayIndex = 0;
+  let bestDistance = Math.abs(indices[0] - targetIndex);
+
+  for (let i = 1; i < indices.length; i++) {
+    const distance = Math.abs(indices[i] - targetIndex);
+    if (distance < bestDistance) {
+      bestDistance = distance;
+      bestArrayIndex = i;
+    }
+  }
+
+  const [chosen] = indices.splice(bestArrayIndex, 1);
+  return chosen;
+}
+
+function remapGapsToTokens(existingGaps, nextTokens) {
+  const indicesByWord = new Map();
+
+  nextTokens.forEach((token, index) => {
+    const key = normalizeTokenKey(token.word || token.raw);
+    if (!key) {
+      return;
+    }
+
+    if (!indicesByWord.has(key)) {
+      indicesByWord.set(key, []);
+    }
+    indicesByWord.get(key).push(index);
+  });
+
+  const remapped = [];
+  const orderedGaps = [...existingGaps].sort(
+    (a, b) => a.tokenIndex - b.tokenIndex
+  );
+
+  orderedGaps.forEach((gap) => {
+    const key = normalizeTokenKey(gap.tokenText);
+    const indices = indicesByWord.get(key) || [];
+    if (!indices.length) {
+      return;
+    }
+
+    const nextIndex = takeClosestIndex(indices, gap.tokenIndex);
+    if (nextIndex === undefined) {
+      return;
+    }
+
+    remapped.push({
+      ...gap,
+      tokenIndex: nextIndex,
+      tokenText:
+        nextTokens[nextIndex]?.word || nextTokens[nextIndex]?.raw || key,
+    });
+  });
+
+  return remapped.sort((a, b) => a.tokenIndex - b.tokenIndex);
+}
+
 function escapeHtml(value) {
   return String(value || "")
     .replace(/&/g, "&amp;")
@@ -69,6 +138,35 @@ export default function CreateFillInTheGapExercisePage() {
 
   const tokens = useMemo(() => tokenizeText(text), [text]);
 
+  const syncGapsWithSelection = (nextSelectedIndices) => {
+    const normalized = [...new Set(nextSelectedIndices)].sort((a, b) => a - b);
+
+    setSelectedIndices(normalized);
+    setGaps((current) =>
+      normalized.map((tokenIndex) => {
+        const existingGap = current.find(
+          (gap) => gap.tokenIndex === tokenIndex
+        );
+
+        if (existingGap) {
+          return {
+            ...existingGap,
+            tokenText:
+              tokens[tokenIndex]?.word ||
+              tokens[tokenIndex]?.raw ||
+              existingGap.tokenText,
+          };
+        }
+
+        return {
+          tokenIndex,
+          tokenText: tokens[tokenIndex]?.word || tokens[tokenIndex]?.raw || "",
+          answers: createDefaultAnswers(),
+        };
+      })
+    );
+  };
+
   useEffect(() => {
     if (!isEditMode || !exerciseData) {
       return;
@@ -105,22 +203,24 @@ export default function CreateFillInTheGapExercisePage() {
       return;
     }
 
+    const nextTokens = tokenizeText(normalizedText);
+    const remappedGaps = remapGapsToTokens(gaps, nextTokens);
+
     setTextHtml(html);
     setText(normalizedText);
-    setSelectedIndices([]);
+    setGaps(remappedGaps);
-    if (step === "configure") {
+    setSelectedIndices(remappedGaps.map((gap) => gap.tokenIndex));
+    if (step === "configure" && remappedGaps.length === 0) {
       setStep("select");
-      setGaps([]);
     }
   };
 
   const toggleGapIndex = (index) => {
-    setSelectedIndices((current) => {
+    const nextSelected = selectedIndices.includes(index)
-      if (current.includes(index)) {
+      ? selectedIndices.filter((item) => item !== index)
-        return current.filter((item) => item !== index);
+      : [...selectedIndices, index];
-      }
+
-      return [...current, index].sort((a, b) => a - b);
+    syncGapsWithSelection(nextSelected);
-    });
   };
 
   const moveToGapConfiguration = () => {
@@ -138,13 +238,7 @@ export default function CreateFillInTheGapExercisePage() {
       return;
     }
 
-    const mappedGaps = selectedIndices.map((tokenIndex) => ({
+    syncGapsWithSelection(selectedIndices);
-      tokenIndex,
-      tokenText: tokens[tokenIndex]?.word || tokens[tokenIndex]?.raw || "",
-      answers: createDefaultAnswers(),
-    }));
-
-    setGaps(mappedGaps);
     setStep("configure");
   };
 
@@ -192,6 +286,13 @@ export default function CreateFillInTheGapExercisePage() {
     });
   };
 
+  const removeGap = (tokenIndex) => {
+    const nextSelected = selectedIndices.filter(
+      (index) => index !== tokenIndex
+    );
+    syncGapsWithSelection(nextSelected);
+  };
+
   const validateConfiguration = () => {
     if (gaps.length === 0) {
       return "Bitte wähle mindestens eine Lücke aus.";
@@ -300,9 +401,13 @@ export default function CreateFillInTheGapExercisePage() {
         />
       </Container>
 
-      {tokens.length > 0 && step === "select" && (
+      {tokens.length > 0 && (
         <Container className="fitg-block">
-          <h3>Wörter anklicken, die als Lücken markiert werden sollen</h3>
+          <h3>
+            {step === "configure"
+              ? "Wörter anklicken, um Lücken hinzuzufügen/zu entfernen"
+              : "Wörter anklicken, die als Lücken markiert werden sollen"}
+          </h3>
           <p className="fitg-help-text">Ausgewählt: {selectedIndices.length}</p>
           <div className="fitg-token-grid">
             {tokens.map((token, index) => {
@@ -340,9 +445,20 @@ export default function CreateFillInTheGapExercisePage() {
                 key={`${gap.tokenIndex}-${gap.tokenText}`}
                 className="fitg-gap-card"
               >
-                <h4>
+                <Row justify="space-between" align="center" wrap="wrap">
-                  Lücke {gapIndex + 1}: "{gap.tokenText}"
+                  <h4>
-                </h4>
+                    Lücke {gapIndex + 1}: "{gap.tokenText}"
+                  </h4>
+                  <button
+                    type="button"
+                    className="fitg-gap-remove"
+                    onClick={() => removeGap(gap.tokenIndex)}
+                    aria-label={`Lücke ${gapIndex + 1} entfernen`}
+                    title="Lücke entfernen"
+                  >
+                    x
+                  </button>
+                </Row>
 
                 <Column gap="md">
                   {gap.answers.map((answer, answerIndex) => (
@@ -448,7 +564,7 @@ export default function CreateFillInTheGapExercisePage() {
               variant="outline"
               onClick={() => setStep("select")}
             >
-              Zurück zur Lückenauswahl
+              Wörter auswählen/ändern
             </Button>
             <Button type="button" onClick={handleSave} disabled={saving}>
               {saving

gradesa/src/app/api/admin/exercises/click/[click_id]/route.js

@@ -1,6 +1,14 @@
 import { NextResponse } from "next/server";
 import { DB } from "@/backend/db";
 import { withAuth } from "@/backend/middleware/withAuth";
+import DOMPurify from "dompurify";
+import { JSDOM } from "jsdom";
+
+function sanitizeHtml(html) {
+  const window = new JSDOM("").window;
+  const purify = DOMPurify(window);
+  return purify.sanitize(String(html || ""), { ADD_ATTR: ["target"] });
+}
 
 function validatePayload({ title, targetCategory, targetWords, allWords }) {
   if (!title || !targetCategory || !targetWords || !allWords) {
@@ -44,7 +52,7 @@ export const GET = withAuth(
       const { click_id } = await params;
 
       const result = await DB.pool(
-        `SELECT id, title, category, target_words, all_words, created_at, updated_at
+        `SELECT id, title, category, target_words, all_words, source_html, created_at, updated_at
          FROM click_exercises
          WHERE id = $1`,
         [click_id]
@@ -77,7 +85,8 @@ export const PUT = withAuth(
     try {
       const { click_id } = await params;
       const body = await request.json();
-      const { title, targetCategory, targetWords, allWords } = body;
+      const { title, targetCategory, targetWords, allWords, sourceHtml } = body;
+      const sanitizedSourceHtml = sanitizeHtml(sourceHtml || "");
 
       const validationError = validatePayload({
         title,
@@ -127,9 +136,17 @@ export const PUT = withAuth(
              category = $2,
              target_words = $3,
              all_words = $4,
+             source_html = $5,
              updated_at = NOW()
-         WHERE id = $5`,
+         WHERE id = $6`,
-        [title, targetCategory, targetWords, allWords, click_id]
+        [
+          title,
+          targetCategory,
+          targetWords,
+          allWords,
+          sanitizedSourceHtml,
+          click_id,
+        ]
       );
 
       return NextResponse.json({ success: true });

gradesa/src/app/api/admin/exercises/click/route.js

@@ -1,10 +1,19 @@
 import { DB } from "@/backend/db";
 import { withAuth } from "@/backend/middleware/withAuth";
+import DOMPurify from "dompurify";
+import { JSDOM } from "jsdom";
+
+function sanitizeHtml(html) {
+  const window = new JSDOM("").window;
+  const purify = DOMPurify(window);
+  return purify.sanitize(String(html || ""), { ADD_ATTR: ["target"] });
+}
 
 export const POST = withAuth(
   async (request) => {
     const json = await request.json();
-    const { title, targetCategory, targetWords, allWords } = json;
+    const { title, targetCategory, targetWords, allWords, sourceHtml } = json;
+    const sanitizedSourceHtml = sanitizeHtml(sourceHtml || "");
 
     if (!title || !targetCategory || !targetWords || !allWords) {
       return Response.json(
@@ -51,9 +60,9 @@ export const POST = withAuth(
       );
     }
     const id = await DB.pool(
-      `INSERT INTO click_exercises (title, category, target_words, all_words)
+      `INSERT INTO click_exercises (title, category, target_words, all_words, source_html)
-     VALUES ($1, $2, $3, $4) returning id`,
+     VALUES ($1, $2, $3, $4, $5) returning id`,
-      [title, targetCategory, targetWords, allWords]
+      [title, targetCategory, targetWords, allWords, sanitizedSourceHtml]
     );
     return Response.json({ id: id.rows[0].id }, { status: 201 });
   },

gradesa/src/app/api/admin/exercises/click/route.test.js

@@ -209,6 +209,55 @@ describe("create click_exercises API", () => {
       "Es müssen zwischen 1 und 1000 Wörter vorhanden sein."
     );
   });
+  it("should store sourceHtml in the database when provided", async () => {
+    const admin = await TestFactory.user({ is_admin: true });
+    const { mockPost } = useTestRequest(admin);
+
+    const sourceHtml = "<p>Die Kinder <b>laufen</b> schnell.</p>";
+
+    const response = await POST(
+      mockPost("api/exercises/create/click", {
+        title: "Verben identifizieren",
+        targetCategory: "Verben",
+        targetWords: ["laufen"],
+        allWords: ["Die", "Kinder", "laufen", "schnell"],
+        sourceHtml,
+      })
+    );
+
+    expect(response.status).toBe(201);
+    const json = await response.json();
+
+    const exercise = await DB.pool(
+      `SELECT source_html FROM click_exercises WHERE id = $1`,
+      [json.id]
+    );
+    expect(exercise.rows[0].source_html).toBe(sourceHtml);
+  });
+  it("should sanitize malicious HTML in sourceHtml", async () => {
+    const admin = await TestFactory.user({ is_admin: true });
+    const { mockPost } = useTestRequest(admin);
+
+    const response = await POST(
+      mockPost("api/exercises/create/click", {
+        title: "Verben identifizieren",
+        targetCategory: "Verben",
+        targetWords: ["laufen"],
+        allWords: ["Die", "Kinder", "laufen"],
+        sourceHtml: '<p>Hallo</p><script>alert("xss")</script>',
+      })
+    );
+
+    expect(response.status).toBe(201);
+    const json = await response.json();
+
+    const exercise = await DB.pool(
+      `SELECT source_html FROM click_exercises WHERE id = $1`,
+      [json.id]
+    );
+    expect(exercise.rows[0].source_html).not.toContain("<script>");
+    expect(exercise.rows[0].source_html).toContain("<p>Hallo</p>");
+  });
   it("should return 409 if exercise with the same title already exists", async () => {
     const admin = await TestFactory.user({ is_admin: true });
     const { mockPost } = useTestRequest(admin);

gradesa/src/app/globals.css

@@ -387,7 +387,7 @@ h1 {
 h2 {
   font-size: 1.2em;
   font-weight: bold;
-  color: var(--tertiary1);
+  color: var(--fg1);
   margin-bottom: 15px;
 }
 
@@ -490,22 +490,35 @@ label {
 }
 
 .rendered-html p {
-  margin-bottom: 1em;
+  margin: 0;
   white-space: pre-wrap;
 }
 
-.rendered-html p:last-child {
+.rendered-html h1,
-  margin-bottom: 0;
+.rendered-html h2,
+.rendered-html h3,
+.rendered-html h4,
+.rendered-html h5,
+.rendered-html h6,
+.rendered-html li {
+  margin: 0;
 }
 
+.rendered-html h1,
+.rendered-html h2,
+.rendered-html h3,
+.rendered-html h4,
+.rendered-html h5,
+.rendered-html h6,
+.rendered-html p,
 .rendered-html li {
-  margin-bottom: 0.35em;
+  line-height: inherit;
 }
 
 .rendered-html ul,
 .rendered-html ol {
-  padding-left: 2rem;
+  padding-left: 1.5em;
-  margin-bottom: 1em;
+  margin: 0;
 }
 
 .rendered-html ul {
@@ -669,4 +682,9 @@ label {
   height: 14px;
   right: -7px;
   bottom: -7px;
+}
+
+.ql-table-dropdown-label,
+.ql-table-dropdown-properties-label {
+  color: var(--bg1);
 }

gradesa/src/app/grammar/exercises/click/[click_id]/page.js

@@ -60,6 +60,7 @@ export default function StudentExercisePage() {
         targetCategory={exercise.category}
         targetWords={exercise.target_words}
         allWords={exercise.all_words}
+        sourceHtml={exercise.source_html}
         previousAnswers={data.userAnswers?.answer || []}
         isPreviewMode={false}
         onSubmit={handleSubmit} // Pass the submit handler as a prop

gradesa/src/app/pages/[type]/[slug]/chapters.css

@@ -11,9 +11,9 @@
 }
 
 .chapter-page-title,
-.chapter-rendered-content h1,
+.chapter-rendered-content>h1,
-.chapter-rendered-content h2,
+.chapter-rendered-content>h2,
-.chapter-rendered-content h3 {
+.chapter-rendered-content>h3 {
   font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   margin-top: 1.5rem;
   margin-bottom: 1rem;
@@ -22,44 +22,22 @@
 }
 
 .chapter-page-title,
-.chapter-rendered-content h1 {
+.chapter-rendered-content>h1 {
   font-size: 2rem;
   padding-bottom: 0.5rem;
   color: var(--fg1);
 }
 
-.chapter-rendered-content h2 {
+.chapter-rendered-content>h2 {
   font-size: 1.75rem;
   color: var(--fg1);
 }
 
-.chapter-rendered-content h3 {
+.chapter-rendered-content>h3 {
   font-size: 1.35rem;
   color: var(--fg1);
 }
 
-p {
-  margin-bottom: 1.25rem;
-  line-height: 1.6;
-  color: var(--fg2);
-  font-size: 1rem;
-}
-
-ul {
-  padding-left: 1.5rem;
-}
-
-li {
-  color: var(--fg2);
-  margin: 0.5rem 0;
-  line-height: 1.5;
-}
-
-a {
-  color: var(--primary2);
-  text-decoration: underline;
-}
-
 .chapter-content {
   max-width: 1400px;
 }
@@ -76,28 +54,34 @@ a {
   font-size: 2.5em;
 }
 
-table {
-  width: 100%;
-  border-collapse: collapse;
-  margin: 1rem 0;
-}
-
-table td,
-table th {
-  border: 1px solid #cbd5e1;
-  padding: 8px;
-  vertical-align: top;
-}
-
-table th {
-  font-weight: 600;
-}
-
 .chapter-rendered-content {
   width: 100%;
   display: block;
 }
 
+.chapter-rendered-content .rendered-html {
+  color: var(--fg2);
+  font-size: 1rem;
+}
+
+.chapter-rendered-content .rendered-html a {
+  color: var(--primary2);
+  text-decoration: underline;
+}
+
+.chapter-rendered-content .rendered-html table td,
+.chapter-rendered-content .rendered-html table th {
+  border: none;
+  padding: 0;
+  vertical-align: top;
+}
+
+.chapter-rendered-content .rendered-html table img {
+  display: block;
+  max-width: 100%;
+  height: auto;
+}
+
 .chapter-rendered-content .rendered-html,
 .chapter-rendered-content .rendered-html {
   width: 100%;

gradesa/src/app/talkback/page.js

@@ -76,7 +76,7 @@ export default function TalkbackPage() {
   return (
     <section className="talkback-container">
       <div className="talkback-box">
-        <h1 className="auth-title">Rückmeldekanal - Feedback geben</h1>
+        <h1 className="auth-title">Brauchen Sie Hilfe?</h1>
 
         {error && <p className="error">{error}</p>}
 

gradesa/src/app/talkback/talkback.css

@@ -1,83 +1,86 @@
-.talkback-container {
+.talkback-container {
-  display: flex;
+  display: flex;
-  justify-content: center;
+  justify-content: center;
-  flex-direction: column;
+  flex-direction: column;
-  flex-grow: 1;
+  flex-grow: 1;
-  align-items: center;
+  align-items: center;
-  padding-top: 10px;
+  padding-top: 10px;
-}
+}
-
+
-.talkback-box {
+.talkback-box {
-  background-color: var(--bg3);
+  background-color: var(--bg3);
-  border-radius: var(--radius-2xl);
+  border-radius: var(--radius-2xl);
-  padding: var(--u-3xl);
+  padding: var(--u-xl);
-  box-shadow: 0 10px 24px rgb(0 0 0 / 10%);
+  box-shadow: 0 10px 24px rgb(0 0 0 / 10%);
-  width: max-content;
+  width: 570px;
-  max-width: fit-content;
+}
-}
+
-
+.auth-box {
-.auth-box {
+  width: 100%;
-  width: 100%;
+  max-width: max-content;
-  max-width: max-content;
+  background-color: var(--bg3);
-  background-color: var(--bg3);
+  border-radius: var(--radius-2xl);
-  border-radius: var(--radius-2xl);
+  padding: var(--u-xl);
-  padding: var(--u-xl);
+  display: flex;
-  display: flex;
+  flex-direction: column;
-  flex-direction: column;
+  gap: var(--u-lg);
-  gap: var(--u-lg);
+}
-}
+
-
+.talkback-form {
-.talkback-form {
+  display: flex;
-  display: flex;
+  flex-direction: column;
-  flex-direction: column;
+  gap: var(--u-lg);
-  gap: var(--u-lg);
+}
-}
+
-
+.auth-title {
-.auth-title {
+  text-align: left;
-  text-align: left;
+  margin-bottom: var(--u-lg);
-  margin-bottom: var(--u-lg);
+  color: var(--fg1);
-  color: var(--fg1);
+}
-}
+
-
+.talkback-message-input {
-.talkback-message-input {
+  resize: none;
-  resize: none;
+  min-height: 220px;
-  min-height: 220px;
+  max-width: 100%;
-  max-width: 100%;
+}
-}
+
-
+.form-group {
-.form-group {
+  display: flex;
-  display: flex;
+  flex-direction: column;
-  flex-direction: column;
+  gap: 0.2rem;
-  gap: 0.2rem;
+}
-}
+
-
+.form-group label {
-.form-label {
+  margin-top: 0;
-  display: block;
+}
-  margin-bottom: var(--u-md);
+
-}
+.form-label {
-
+  display: block;
-.form-input {
+  /* margin-bottom: var(--u-md); */
-  width: 100%;
+}
-  padding: var(--u-md);
+
-  border-radius: var(--radius-sm);
+.form-input {
-}
+  width: 100%;
-
+  padding: var(--u-md);
-.form-button {
+  border-radius: var(--radius-sm);
-  margin-top: var(--u-2xl);
+}
-}
+
-
+.form-button {
-.error {
+  margin-top: var(--u-2xl);
-  text-align: center;
+}
-  margin-bottom: 1.5rem;
+
-}
+.error {
-
+  text-align: center;
-@media (max-width: 768px) {
+  margin-bottom: 1.5rem;
-  .talkback-container {
+}
-    padding: var(--u-lg) var(--u-md) var(--u-2xl);
+
-  }
+@media (max-width: 768px) {
-
+  .talkback-container {
-  .talkback-box {
+    padding: var(--u-lg) var(--u-md) var(--u-2xl);
-    padding: var(--u-xl);
+  }
-    border-radius: var(--radius-xl);
+
-  }
+  .talkback-box {
+    padding: var(--u-xl);
+    border-radius: var(--radius-xl);
+  }
 }

gradesa/src/components/ui/button/button.module.css

@@ -5,6 +5,8 @@
   padding: 0.5rem 1rem;
   border-radius: 0.25rem;
   cursor: pointer;
+  font: inherit;
+  line-height: inherit;
   transition:
     background-color 0.1s ease-in-out,
     border-color 0.1s ease-in-out,
@@ -138,6 +140,12 @@
   border: none;
   background-color: transparent;
   width: fit-content;
+  color: inherit;
+  font: inherit;
+  line-height: inherit;
+  text-decoration: inherit;
+  text-decoration-color: inherit;
+  text-decoration-thickness: inherit;
 
   &:hover {
     background-color: var(--bg2);

gradesa/src/components/ui/click/click.css

@@ -3,9 +3,11 @@
 }
 
 .word-container {
-    line-height: 2.2;
+    font-size: 1.125rem;
+    line-height: 1.7;
+    padding: 12px 15px;
     white-space: pre-wrap;
-    background: var(--bg3);
+    background: var(--bg1);
 }
 
 .word-punct {
@@ -19,5 +21,83 @@
 
 .word-line-break {
     display: block;
-    height: 0.75rem;
+    height: 0;
+}
+
+.click-instruction {
+    background: var(--bg3);
+    color: var(--fg1);
+    padding: 0.3em 1em;
+    border-radius: var(--radius-sm);
+    font-size: var(--font-md);
+}
+
+.click-source-html {
+    overflow-wrap: anywhere;
+    word-break: break-word;
+}
+
+.click-rendered-content {
+    /* Match Quill editor text box metrics so saved wrapping mirrors editing view. */
+    padding: 12px 15px;
+    font-size: 1.125rem;
+    line-height: 1.7;
+    color: var(--fg1);
+    white-space: pre-wrap;
+}
+
+.click-rendered-content br {
+    display: block;
+    line-height: inherit;
+}
+
+.click-rendered-content :where(p, li, strong, em, span, a, h1, h2, h3, h4, h5, h6):not([style*="color"]) {
+    color: var(--fg1);
+}
+
+.click-rendered-content p {
+    margin: 0;
+}
+
+.click-rendered-content ul,
+.click-rendered-content ol {
+    margin: 0;
+    padding-left: 2rem;
+}
+
+.click-rendered-content li {
+    margin: 0.25em 0;
+}
+
+.click-rendered-content li::marker {
+    color: currentColor;
+}
+
+.click-rendered-content .ql-indent-1 {
+    padding-left: 3em;
+}
+
+.click-rendered-content .ql-indent-2 {
+    padding-left: 6em;
+}
+
+.click-rendered-content .ql-indent-3 {
+    padding-left: 9em;
+}
+
+.click-rendered-content .ql-indent-4 {
+    padding-left: 12em;
+}
+
+.rendered-html ul,
+.rendered-html ol {
+    padding-left: 1.5em;
+}
+
+.rendered-html li[data-list="bullet"] {
+    list-style-type: disc;
+}
+
+.rendered-html li[data-list="ordered"] {
+    list-style-type: decimal;
 }

gradesa/src/components/ui/click/click.js

@@ -2,6 +2,7 @@ import React, { useMemo, useState } from "react";
 import { Button } from "../button";
 import { Container } from "../layout/container";
 import { Column } from "@/components/ui/layout/container";
+import parse from "html-react-parser";
 import "./click.css";
 
 const WORD_REGEX = /\p{L}+(?:['’-]\p{L}+)*/gu;
@@ -38,11 +39,77 @@ const splitTokenToParts = (token) => {
 
 const isWhitespaceToken = (token) => /^[^\S\n]+$/u.test(token);
 
+function buildHtmlWithWordSlots(sourceHtml) {
+  if (!sourceHtml || typeof window === "undefined") {
+    return { html: "", slots: [] };
+  }
+
+  const doc = new window.DOMParser().parseFromString(
+    `<div id="click-root">${sourceHtml}</div>`,
+    "text/html"
+  );
+  const root = doc.getElementById("click-root");
+
+  if (!root) {
+    return { html: "", slots: [] };
+  }
+
+  const walker = doc.createTreeWalker(root, window.NodeFilter.SHOW_TEXT);
+  const textNodes = [];
+  let current;
+
+  while ((current = walker.nextNode())) {
+    textNodes.push(current);
+  }
+
+  let wordIndex = 0;
+  const slots = [];
+
+  for (const textNode of textNodes) {
+    const rawText = textNode.nodeValue || "";
+    const chunks = rawText.match(/\s+|[^\s]+/g) || [];
+    const fragment = doc.createDocumentFragment();
+
+    for (const chunk of chunks) {
+      if (/^\s+$/.test(chunk)) {
+        fragment.appendChild(doc.createTextNode(chunk));
+        continue;
+      }
+
+      const parts = splitTokenToParts(chunk);
+      for (const part of parts) {
+        if (part.type === "word") {
+          const slotKey = `w-${wordIndex}`;
+          const wordNode = doc.createElement("click-word");
+
+          wordNode.setAttribute("data-slot-key", slotKey);
+          wordNode.setAttribute("data-word", part.value);
+          wordNode.textContent = part.value;
+
+          slots.push({
+            slotKey,
+            word: part.value,
+          });
+          wordIndex += 1;
+          fragment.appendChild(wordNode);
+        } else {
+          fragment.appendChild(doc.createTextNode(part.value));
+        }
+      }
+    }
+
+    textNode.parentNode?.replaceChild(fragment, textNode);
+  }
+
+  return { html: root.innerHTML, slots };
+}
+
 const WordSelectionExercise = ({
   title,
   targetCategory,
   targetWords,
   allWords,
+  sourceHtml,
   previousAnswers,
   onSelectionChange,
   onSubmit,
@@ -56,7 +123,16 @@ const WordSelectionExercise = ({
   const [selectedSlotKeys, setSelectedSlotKeys] = useState([]);
   const [message, setMessage] = useState("");
 
-  const wordSlots = useMemo(() => {
+  const normalizedSourceHtml = useMemo(() => {
+    return String(sourceHtml || "");
+  }, [sourceHtml]);
+
+  const htmlSlotsData = useMemo(
+    () => buildHtmlWithWordSlots(normalizedSourceHtml),
+    [normalizedSourceHtml]
+  );
+
+  const fallbackWordSlots = useMemo(() => {
     const slots = [];
 
     allWords?.forEach((token, tokenIndex) => {
@@ -76,12 +152,63 @@ const WordSelectionExercise = ({
     return slots;
   }, [allWords]);
 
+  const wordSlots = useMemo(
+    () =>
+      htmlSlotsData.slots.length > 0 ? htmlSlotsData.slots : fallbackWordSlots,
+    [htmlSlotsData.slots, fallbackWordSlots]
+  );
+
   const slotToWord = useMemo(
     () =>
       Object.fromEntries(wordSlots.map(({ slotKey, word }) => [slotKey, word])),
     [wordSlots]
   );
 
+  const targetSlotKeys = useMemo(() => {
+    const rawTargets = Array.isArray(targetWords) ? targetWords : [];
+    const slotKeySet = new Set(wordSlots.map(({ slotKey }) => slotKey));
+
+    // New format: target words are stored as unique slot keys.
+    const allAreSlotKeys =
+      rawTargets.length > 0 &&
+      rawTargets.every((target) => slotKeySet.has(target));
+    if (allAreSlotKeys) {
+      return rawTargets;
+    }
+
+    // Legacy format: map target words to the first unmatched occurrences.
+    const needed = {};
+    rawTargets.forEach((word) => {
+      needed[word] = (needed[word] || 0) + 1;
+    });
+
+    const used = {};
+    const mappedKeys = [];
+
+    wordSlots.forEach(({ slotKey, word }) => {
+      const remaining = (needed[word] || 0) - (used[word] || 0);
+      if (remaining > 0) {
+        mappedKeys.push(slotKey);
+        used[word] = (used[word] || 0) + 1;
+      }
+    });
+
+    return mappedKeys;
+  }, [targetWords, wordSlots]);
+
+  const targetSlotKeySet = useMemo(
+    () => new Set(targetSlotKeys),
+    [targetSlotKeys]
+  );
+
+  const usesSlotKeyTargets = useMemo(() => {
+    const rawTargets = Array.isArray(targetWords) ? targetWords : [];
+    return (
+      rawTargets.length > 0 &&
+      rawTargets.every((target) => targetSlotKeySet.has(target))
+    );
+  }, [targetWords, targetSlotKeySet]);
+
   const handleWordClick = (slotKey) => {
     if (isSubmitted && !isPreviewMode) return;
 
@@ -95,31 +222,33 @@ const WordSelectionExercise = ({
     setSelectedSlotKeys(updatedKeys);
 
     if (isPreviewMode && onSelectionChange) {
-      onSelectionChange(
+      // In preview/admin mode we persist exact selected occurrences.
-        updatedKeys.map((key) => slotToWord[key]).filter(Boolean)
+      onSelectionChange(updatedKeys);
-      );
     }
   };
 
   const checkAnswers = () => {
     if (isPreviewMode) return;
 
-    const selectedWordValues = selectedSlotKeys
+    const selectedSet = new Set(selectedSlotKeys);
-      .map((key) => slotToWord[key])
+    const incorrectSelections = selectedSlotKeys.filter(
-      .filter(Boolean);
+      (slotKey) => !targetSlotKeySet.has(slotKey)
-    const correctAnswers = targetWords;
-    const incorrectSelections = selectedWordValues.filter(
-      (word) => !correctAnswers.includes(word)
     );
-    const missedCorrectAnswers = correctAnswers.filter(
+    const missedCorrectAnswers = targetSlotKeys.filter(
-      (word) => !selectedWordValues.includes(word)
+      (slotKey) => !selectedSet.has(slotKey)
     );
+    const totalCorrectTargets = targetSlotKeys.length;
+
+    if (totalCorrectTargets === 0) {
+      onSubmit([], 0, "Diese Übung enthält keine markierten Zielwörter.");
+      return;
+    }
 
     const score = Math.round(
-      ((correctAnswers.length -
+      ((totalCorrectTargets -
         missedCorrectAnswers.length -
         incorrectSelections.length) /
-        correctAnswers.length) *
+        totalCorrectTargets) *
         100
     );
 
@@ -135,7 +264,11 @@ const WordSelectionExercise = ({
       feedbackMessage = "Weiter üben! Punktzahl: " + score + "%";
     }
 
-    onSubmit(selectedWordValues, score, feedbackMessage);
+    const selectedPayload = usesSlotKeyTargets
+      ? selectedSlotKeys
+      : selectedSlotKeys.map((key) => slotToWord[key]).filter(Boolean);
+
+    onSubmit(selectedPayload, score, feedbackMessage);
   };
 
   const resetExercise = () => {
@@ -150,35 +283,46 @@ const WordSelectionExercise = ({
       return;
     }
 
-    const needed = {};
+    const availableSlotKeys = new Set(wordSlots.map(({ slotKey }) => slotKey));
-    previousAnswers.forEach((w) => {
+    const previousAreSlotKeys = previousAnswers.every((answer) =>
-      needed[w] = (needed[w] || 0) + 1;
+      availableSlotKeys.has(answer)
-    });
+    );
 
-    const used = {};
+    let restoredKeys = [];
-    const restoredKeys = [];
 
-    wordSlots.forEach(({ slotKey, word }) => {
+    if (previousAreSlotKeys) {
-      const remaining = (needed[word] || 0) - (used[word] || 0);
+      restoredKeys = previousAnswers.filter((answer) =>
-      if (remaining > 0) {
+        availableSlotKeys.has(answer)
-        restoredKeys.push(slotKey);
+      );
-        used[word] = (used[word] || 0) + 1;
+    } else {
-      }
+      const needed = {};
-    });
+      previousAnswers.forEach((word) => {
+        needed[word] = (needed[word] || 0) + 1;
+      });
+
+      const used = {};
+      wordSlots.forEach(({ slotKey, word }) => {
+        const remaining = (needed[word] || 0) - (used[word] || 0);
+        if (remaining > 0) {
+          restoredKeys.push(slotKey);
+          used[word] = (used[word] || 0) + 1;
+        }
+      });
+    }
 
     setSelectedSlotKeys(restoredKeys);
   };
 
-  const getTokenStyle = (word, slotKey) => {
+  const getTokenStyle = (_word, slotKey) => {
     if (selectedSlotKeys.includes(slotKey)) {
       if (isSubmitted && !isPreviewMode) {
-        return targetWords.includes(word)
+        return targetSlotKeySet.has(slotKey)
           ? { backgroundColor: "var(--green)" }
           : { backgroundColor: "var(--red)" };
       }
       return { backgroundColor: "var(--click-selected-bg, var(--blue))" };
     } else {
-      if (isSubmitted && targetWords.includes(word) && !isPreviewMode) {
+      if (isSubmitted && targetSlotKeySet.has(slotKey) && !isPreviewMode) {
         return {
           backgroundColor: "var(--click-missed-bg, var(--yellow))",
           border: "1px solid var(--click-missed-border, var(--yellow-border))",
@@ -189,7 +333,7 @@ const WordSelectionExercise = ({
 
   const renderToken = (token, tokenIndex) => {
     if (token === "\n") {
-      return <span key={`${tokenIndex}-nl`} className="word-line-break" />;
+      return <br key={`${tokenIndex}-nl`} />;
     }
 
     if (isWhitespaceToken(token)) {
@@ -229,14 +373,47 @@ const WordSelectionExercise = ({
   return (
     <Column gap="md">
       <h1>{title}</h1>
-      <i>{`Wähle alle ${targetCategory} aus dem untenstehenden Text aus.`}</i>
+      <div className="click-instruction">
-      <Container className="word-container">
+        <i>{`Wähle alle ${targetCategory} aus dem untenstehenden Text aus.`}</i>
-        {allWords?.map((token, index) => (
+      </div>
-          <React.Fragment key={index}>
+      {htmlSlotsData.slots.length > 0 ? (
-            {renderToken(token, index)}
+        <Container className="word-container click-source-html">
-          </React.Fragment>
+          <div className="rendered-html click-rendered-content">
-        ))}
+            {parse(htmlSlotsData.html, {
-      </Container>
+              replace(domNode) {
+                if (
+                  domNode?.type === "tag" &&
+                  domNode.name === "click-word" &&
+                  domNode.attribs?.["data-slot-key"]
+                ) {
+                  const slotKey = domNode.attribs["data-slot-key"];
+                  const word = domNode.attribs["data-word"] || "";
+
+                  return (
+                    <Button
+                      key={slotKey}
+                      onClick={() => handleWordClick(slotKey)}
+                      variant="click"
+                      style={getTokenStyle(word, slotKey)}
+                    >
+                      {word}
+                    </Button>
+                  );
+                }
+                return undefined;
+              },
+            })}
+          </div>
+        </Container>
+      ) : (
+        <Container className="word-container">
+          {allWords?.map((token, index) => (
+            <React.Fragment key={index}>
+              {renderToken(token, index)}
+            </React.Fragment>
+          ))}
+        </Container>
+      )}
       {feedback && !isPreviewMode && (
         <>
           <div>{feedback}</div>

gradesa/src/components/ui/editor/ClientEditor.js

@@ -24,6 +24,186 @@ const ClientEditor = (props) => {
 
   useEffect(() => {
     let quill;
+    let tableFormObserver;
+    let detachRepositionListeners;
+    let lastTableMenuRect = null;
+    let rafRepositionId = null;
+
+    const getActiveTable = () => {
+      if (!quill) {
+        return null;
+      }
+
+      const tableBetterModule = quill.getModule("table-better");
+      const tableFromModule = tableBetterModule?.tableMenus?.table;
+      if (tableFromModule instanceof HTMLElement) {
+        return tableFromModule;
+      }
+
+      const selectedCell = quill.root.querySelector(
+        "td.ql-cell-focused, td.ql-cell-selected, th.ql-cell-focused, th.ql-cell-selected"
+      );
+      if (selectedCell instanceof HTMLElement) {
+        return selectedCell.closest("table");
+      }
+
+      return null;
+    };
+
+    const getAnchorRect = () => {
+      const liveMenus = quill?.container?.querySelector(
+        ".ql-table-menus-container"
+      );
+      if (liveMenus instanceof HTMLElement) {
+        const rect = liveMenus.getBoundingClientRect();
+        if (rect.width > 0 && rect.height > 0) {
+          lastTableMenuRect = rect;
+          return rect;
+        }
+      }
+
+      if (lastTableMenuRect) {
+        return lastTableMenuRect;
+      }
+
+      const table = getActiveTable();
+      if (table instanceof HTMLElement) {
+        return table.getBoundingClientRect();
+      }
+
+      return null;
+    };
+
+    const repositionTablePropertiesForm = () => {
+      if (!quill) {
+        return;
+      }
+
+      const form = quill.container.querySelector(".ql-table-properties-form");
+      if (!(form instanceof HTMLElement)) {
+        return;
+      }
+
+      const anchorRect = getAnchorRect();
+      if (!anchorRect) {
+        return;
+      }
+
+      const formRect = form.getBoundingClientRect();
+      const viewportPadding = 8;
+
+      let nextTop = anchorRect.bottom + 10;
+      const nextTopIfAbove = anchorRect.top - formRect.height - 10;
+      if (nextTop + formRect.height > window.innerHeight - viewportPadding) {
+        nextTop = nextTopIfAbove;
+      }
+      if (nextTop < viewportPadding) {
+        nextTop = viewportPadding;
+      }
+
+      let nextLeft = anchorRect.left + (anchorRect.width - formRect.width) / 2;
+      const maxLeft = Math.max(
+        viewportPadding,
+        window.innerWidth - formRect.width - viewportPadding
+      );
+      nextLeft = Math.min(Math.max(viewportPadding, nextLeft), maxLeft);
+
+      form.style.position = "fixed";
+      form.style.left = `${Math.round(nextLeft)}px`;
+      form.style.top = `${Math.round(nextTop)}px`;
+      form.style.margin = "0";
+      form.style.zIndex = "9999";
+      form.classList.add("ql-table-triangle-none");
+    };
+
+    const scheduleReposition = () => {
+      if (rafRepositionId !== null) {
+        return;
+      }
+      rafRepositionId = requestAnimationFrame(() => {
+        rafRepositionId = null;
+        repositionTablePropertiesForm();
+      });
+    };
+
+    const setupTablePropertiesRepositioning = () => {
+      if (!quill?.container) {
+        return;
+      }
+
+      const onWindowResize = () => scheduleReposition();
+      const onEditorScroll = () => scheduleReposition();
+      const onEditorClick = () => scheduleReposition();
+      const onEditorPointerDown = (event) => {
+        const target = event.target;
+        if (!(target instanceof HTMLElement)) {
+          return;
+        }
+        const menus = target.closest(".ql-table-menus-container");
+        if (menus instanceof HTMLElement) {
+          const rect = menus.getBoundingClientRect();
+          if (rect.width > 0 && rect.height > 0) {
+            lastTableMenuRect = rect;
+          }
+        }
+      };
+      const onEditorClickCapture = (event) => {
+        const target = event.target;
+        if (!(target instanceof HTMLElement)) {
+          return;
+        }
+
+        // quill-table-better has click handlers that call getAttribute on possibly null nodes.
+        // Block only invalid clicks before plugin bubbling listeners execute.
+        const checkContainer = target.closest(".ql-table-check-container");
+        if (checkContainer && !target.closest("span.ql-table-tooltip-hover")) {
+          event.stopPropagation();
+          return;
+        }
+      };
+
+      window.addEventListener("resize", onWindowResize);
+      quill.root.addEventListener("scroll", onEditorScroll, true);
+      quill.root.addEventListener("click", onEditorClick, true);
+      quill.container.addEventListener(
+        "pointerdown",
+        onEditorPointerDown,
+        true
+      );
+      quill.container.addEventListener("click", onEditorClickCapture, true);
+
+      tableFormObserver = new MutationObserver(() => {
+        if (quill.container.querySelector(".ql-table-properties-form")) {
+          scheduleReposition();
+        }
+      });
+
+      tableFormObserver.observe(quill.container, {
+        childList: true,
+        subtree: true,
+      });
+
+      detachRepositionListeners = () => {
+        window.removeEventListener("resize", onWindowResize);
+        quill.root.removeEventListener("scroll", onEditorScroll, true);
+        quill.root.removeEventListener("click", onEditorClick, true);
+        quill.container.removeEventListener(
+          "pointerdown",
+          onEditorPointerDown,
+          true
+        );
+        quill.container.removeEventListener(
+          "click",
+          onEditorClickCapture,
+          true
+        );
+        if (rafRepositionId !== null) {
+          cancelAnimationFrame(rafRepositionId);
+          rafRepositionId = null;
+        }
+      };
+    };
+
     const load = async () => {
       const Quill = (await import("quill")).default;
       const TableBetter = (await import("quill-table-better")).default;
@@ -112,6 +292,7 @@ const ClientEditor = (props) => {
           updateEditorContentRef.current?.(html);
         });
         quillRef.current = quill;
+        setupTablePropertiesRepositioning();
         if (props.defaultContent) {
           setHtmlContent(quill, props.defaultContent);
         }
@@ -120,6 +301,10 @@ const ClientEditor = (props) => {
     load();
 
     return () => {
+      tableFormObserver?.disconnect();
+      tableFormObserver = null;
+      detachRepositionListeners?.();
+      detachRepositionListeners = null;
       if (containerRef.current) {
         containerRef.current.innerHTML = "";
       }

gradesa/src/components/ui/sidebar/sidebar.js

@@ -115,7 +115,7 @@ function StudentSideBar() {
         Glossar
       </Link>
       <Link className={styles.sidebarLink} href="/talkback">
-        Rückmeldekanal - Feedback geben
+        Brauchen Sie Hilfe?
       </Link>
       <SidebarGroup
         title="Links zu anderen Webseiten"