Enhance Exercise List Page with AI Assistant Toggle and UI Improvements

- Introduced a new AI assistant toggle in the Exercise List Page header, allowing users to enable quick exercise creation via AI suggestions.
- Updated the ExerciseListSearchBar component to remove deprecated AI quick create functionality, streamlining the interface.
- Enhanced CSS styles for the AI assistant toggle, improving visual feedback and user interaction.
- Improved overall layout and spacing in the exercises page for better usability.

frontend/src/app.css

@@ -3733,6 +3733,68 @@ html.modal-scroll-locked .app-main {
 .exercises-page__title {
   margin: 0;
 }
+.exercises-page__header-actions {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 10px;
+}
+.exercises-ai-assistant-toggle {
+  display: inline-flex;
+  align-items: center;
+  gap: 10px;
+  cursor: pointer;
+  user-select: none;
+  font-size: 14px;
+  color: var(--text2);
+  padding: 6px 10px;
+  border-radius: 8px;
+  border: 1px solid var(--border);
+  background: var(--surface2);
+}
+.exercises-ai-assistant-toggle:hover {
+  border-color: var(--accent-dark, rgba(29, 158, 117, 0.45));
+}
+.exercises-ai-assistant-toggle:has(input:checked) {
+  border-color: var(--accent);
+  background: var(--accent-light, rgba(29, 158, 117, 0.12));
+  color: var(--accent-dark);
+  font-weight: 600;
+}
+.exercises-ai-assistant-toggle input {
+  position: absolute;
+  opacity: 0;
+  width: 0;
+  height: 0;
+  pointer-events: none;
+}
+.exercises-ai-assistant-toggle__track {
+  position: relative;
+  flex-shrink: 0;
+  width: 40px;
+  height: 22px;
+  border-radius: 999px;
+  background: var(--border);
+  transition: background 0.15s ease;
+}
+.exercises-ai-assistant-toggle__track::after {
+  content: '';
+  position: absolute;
+  top: 2px;
+  left: 2px;
+  width: 18px;
+  height: 18px;
+  border-radius: 50%;
+  background: #fff;
+  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
+  transition: transform 0.15s ease;
+}
+.exercises-ai-assistant-toggle:has(input:checked) .exercises-ai-assistant-toggle__track {
+  background: var(--accent);
+}
+.exercises-ai-assistant-toggle:has(input:checked) .exercises-ai-assistant-toggle__track::after {
+  transform: translateX(18px);
+}
 .exercises-page-toolbar-tabs {
   margin-bottom: 14px;
 }

frontend/src/components/exercises/ExerciseListSearchBar.jsx

@@ -14,8 +14,6 @@ export default function ExerciseListSearchBar({
   exerciseCount,
   allOnPageSelected,
   onToggleSelectAllPage,
-  aiQuickCreateEnabled = false,
-  onToggleAiQuickCreate,
 }) {
   return (
     <div className="card exercise-search-bar">
@@ -50,19 +48,6 @@ export default function ExerciseListSearchBar({
       />
       <div className="exercise-search-bar__actions exercise-search-bar__actions--split">
         <div className="exercise-search-bar__actions-main">
-          {typeof onToggleAiQuickCreate === 'function' ? (
-            <button
-              type="button"
-              className={
-                'btn btn-secondary exercise-mine-toggle' +
-                (aiQuickCreateEnabled ? ' exercise-mine-toggle--active' : '')
-              }
-              onClick={onToggleAiQuickCreate}
-              title="Neue Übung per KI aus dem Suchtext vorschlagen und anlegen"
-            >
-              KI-Anlage
-            </button>
-          ) : null}
           <button
             type="button"
             className={'btn btn-secondary exercise-mine-toggle' + (mineOnly ? ' exercise-mine-toggle--active' : '')}
@@ -108,13 +93,6 @@ export default function ExerciseListSearchBar({
       <p className="exercise-search-hint">
         Trefferliste aktualisiert sich kurz nach Eingabe. Titel der aktuellen Liste erscheinen als Vorschläge (Pfeil im
         Feld). Fachliche Filter über „Filter“ – zwischen Feldern UND, Auswahl mehrerer Werte je Feld mit ODER.
-        {aiQuickCreateEnabled ? (
-          <>
-            {' '}
-            <strong>KI-Anlage aktiv:</strong> Suchtext als Ausgang für einen KI-Entwurf — ohne Treffer oder direkt über
-            „Mit KI anlegen“.
-          </>
-        ) : null}
         {exerciseCount > 0 ? (
           <>
             {' '}

frontend/src/components/exercises/ExercisesListPageRoot.jsx

@@ -594,13 +594,27 @@ function ExercisesListPageRoot() {
       <div className="exercises-page__header">
         <h1 className="page-title exercises-page__title">Übungen</h1>
         {pageTab === 'list' ? (
-          <NavStateLink
-            to="/exercises/new"
-            returnContext={exercisesModuleReturnContext}
-            className="btn btn-primary"
-          >
-            + Neu
-          </NavStateLink>
+          <div className="exercises-page__header-actions">
+            <label
+              className="exercises-ai-assistant-toggle"
+              title="Neue Übung per KI vorschlagen — Titel, optional Kurzbeschreibung, Fokusbereich"
+            >
+              <input
+                type="checkbox"
+                checked={aiQuickCreateEnabled}
+                onChange={(e) => setAiQuickCreateEnabled(e.target.checked)}
+              />
+              <span className="exercises-ai-assistant-toggle__track" aria-hidden="true" />
+              <span>Neu mit KI-Assistent</span>
+            </label>
+            <NavStateLink
+              to="/exercises/new"
+              returnContext={exercisesModuleReturnContext}
+              className="btn btn-primary"
+            >
+              + Neu
+            </NavStateLink>
+          </div>
         ) : (
           <span aria-hidden="true" />
         )}
@@ -643,8 +657,6 @@ function ExercisesListPageRoot() {
         exerciseCount={exercises.length}
         allOnPageSelected={allOnPageSelected}
         onToggleSelectAllPage={toggleSelectAllPage}
-        aiQuickCreateEnabled={aiQuickCreateEnabled}
-        onToggleAiQuickCreate={() => setAiQuickCreateEnabled((v) => !v)}
       />
 
       {showQuickCreateOffer ? (
@@ -663,7 +675,7 @@ function ExercisesListPageRoot() {
           onRunAi={runQuickCreateAiSuggest}
           hint={
             aiQuickCreateEnabled
-              ? 'KI-Anlage: Titel aus Suche oder manuell; Kurzbeschreibung optional — leer für freien KI-Vorschlag, ausgefüllt als Ausgangsidee.'
+              ? 'Titel aus Suche oder manuell; Kurzbeschreibung optional — leer für freien KI-Vorschlag, ausgefüllt als deine Ausgangsidee.'
               : undefined
           }
         />