refactor: enhance filtering logic and UI for ExercisesListPage

- Removed the countActiveFilterGroups function and replaced it with a more comprehensive filterChips implementation to manage active filters.
- Improved the rendering of active filters with dynamic chips that allow users to remove individual filters.
- Updated the UI to reflect the new filtering logic, enhancing user experience and interaction with the filter options.
- Adjusted the layout and styling for better visibility and usability of the filter components.

frontend/src/app.css

@@ -1586,16 +1586,98 @@ a.analysis-split__nav-item {
   grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
   gap: 14px;
 }
-.exercise-filter-level-row {
-  grid-column: 1 / -1;
-  display: grid;
-  grid-template-columns: 1fr 1fr;
-  gap: 12px;
+.exercise-filters-modal-grid--two {
+  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
 }
-@media (max-width: 480px) {
-  .exercise-filter-level-row {
-    grid-template-columns: 1fr;
-  }
+.exercise-filter-chips-row {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px;
+  align-items: center;
+  margin-top: 10px;
+}
+.exercise-filter-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  max-width: 100%;
+  padding: 5px 10px;
+  border-radius: 999px;
+  border: 1px solid var(--border);
+  background: var(--surface2);
+  font-size: 12px;
+  cursor: pointer;
+  font-family: inherit;
+  color: var(--text1);
+  text-align: left;
+}
+.exercise-filter-chip__text {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  max-width: min(260px, 88vw);
+}
+.exercise-filter-chip__x {
+  flex-shrink: 0;
+  opacity: 0.65;
+  font-weight: 700;
+  line-height: 1;
+}
+.exercise-filter-section {
+  margin-bottom: 20px;
+}
+.exercise-filter-section--last {
+  margin-bottom: 0;
+}
+.exercise-filter-section-title {
+  margin: 0 0 10px;
+  font-size: 11px;
+  text-transform: uppercase;
+  letter-spacing: 0.06em;
+  color: var(--text3);
+  font-weight: 700;
+}
+.exercise-filter-skill-block {
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  padding: 12px;
+  background: var(--surface2);
+}
+.exercise-filter-skill-block > .form-label {
+  margin-bottom: 6px;
+}
+.exercise-filter-skill-hint {
+  margin: 10px 0 8px;
+  font-size: 12px;
+  color: var(--text3);
+  line-height: 1.35;
+}
+.exercise-filter-skill-levels-row {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: flex-end;
+  gap: 10px;
+}
+.exercise-filter-skill-level-field {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  min-width: 0;
+}
+.exercise-filter-skill-level-caption {
+  font-size: 11px;
+  color: var(--text3);
+  font-weight: 600;
+}
+.exercise-filter-level-select {
+  width: 72px;
+  padding: 6px 8px;
+  font-size: 14px;
+}
+.exercise-filter-skill-dash {
+  padding-bottom: 8px;
+  color: var(--text3);
+  font-weight: 600;
 }
 
 /* Reifegradmodell-Admin: klare Schritte, responsives Raster */

frontend/src/pages/ExercisesListPage.jsx

@@ -19,17 +19,9 @@ const INITIAL_FILTERS = {
   status_any: [],
 }
 
-function countActiveFilterGroups(f) {
-  let n = 0
-  if (f.focus_area_ids?.length) n++
-  if (f.style_direction_ids?.length) n++
-  if (f.training_type_ids?.length) n++
-  if (f.target_group_ids?.length) n++
-  if (f.skill_ids?.length) n++
-  if (f.skill_min_level || f.skill_max_level) n++
-  if (f.visibility_any?.length) n++
-  if (f.status_any?.length) n++
-  return n
+function levelOptionShort(levelStr) {
+  const o = LEVEL_FILTER_OPTS.find((x) => String(x.level) === String(levelStr))
+  return o ? String(o.level) : String(levelStr)
 }
 
 function ExercisesListPage() {
@@ -53,8 +45,6 @@ function ExercisesListPage() {
   const [filters, setFilters] = useState(() => ({ ...INITIAL_FILTERS }))
   const [filterModalOpen, setFilterModalOpen] = useState(false)
 
-  const activeFilterGroups = useMemo(() => countActiveFilterGroups(filters), [filters])
-
   useEffect(() => {
     const t = setTimeout(() => setDebouncedSearch(searchInput.trim()), 400)
     return () => clearTimeout(t)
@@ -116,6 +106,122 @@ function ExercisesListPage() {
     []
   )
 
+  const filterChips = useMemo(() => {
+    const chips = []
+
+    ;(filters.focus_area_ids || []).forEach((id) => {
+      const opt = focusOptions.find((o) => String(o.id) === String(id))
+      chips.push({
+        key: `fa-${id}`,
+        label: `Fokus: ${opt?.label ?? id}`,
+        onRemove: () =>
+          setFilters((prev) => ({
+            ...prev,
+            focus_area_ids: prev.focus_area_ids.filter((x) => String(x) !== String(id)),
+          })),
+      })
+    })
+    ;(filters.style_direction_ids || []).forEach((id) => {
+      const opt = styleOptions.find((o) => String(o.id) === String(id))
+      chips.push({
+        key: `sd-${id}`,
+        label: `Stil: ${opt?.label ?? id}`,
+        onRemove: () =>
+          setFilters((prev) => ({
+            ...prev,
+            style_direction_ids: prev.style_direction_ids.filter((x) => String(x) !== String(id)),
+          })),
+      })
+    })
+    ;(filters.training_type_ids || []).forEach((id) => {
+      const opt = trainingTypeOptions.find((o) => String(o.id) === String(id))
+      chips.push({
+        key: `tt-${id}`,
+        label: `Trainingsstil: ${opt?.label ?? id}`,
+        onRemove: () =>
+          setFilters((prev) => ({
+            ...prev,
+            training_type_ids: prev.training_type_ids.filter((x) => String(x) !== String(id)),
+          })),
+      })
+    })
+    ;(filters.target_group_ids || []).forEach((id) => {
+      const opt = targetGroupOptions.find((o) => String(o.id) === String(id))
+      chips.push({
+        key: `tg-${id}`,
+        label: `Zielgruppe: ${opt?.label ?? id}`,
+        onRemove: () =>
+          setFilters((prev) => ({
+            ...prev,
+            target_group_ids: prev.target_group_ids.filter((x) => String(x) !== String(id)),
+          })),
+      })
+    })
+    ;(filters.skill_ids || []).forEach((id) => {
+      const opt = skillOptions.find((o) => String(o.id) === String(id))
+      chips.push({
+        key: `sk-${id}`,
+        label: `Fähigkeit: ${opt?.label ?? id}`,
+        onRemove: () =>
+          setFilters((prev) => ({
+            ...prev,
+            skill_ids: prev.skill_ids.filter((x) => String(x) !== String(id)),
+          })),
+      })
+    })
+
+    if (filters.skill_min_level || filters.skill_max_level) {
+      const a = filters.skill_min_level ? levelOptionShort(filters.skill_min_level) : '…'
+      const b = filters.skill_max_level ? levelOptionShort(filters.skill_max_level) : '…'
+      chips.push({
+        key: 'skill-levels',
+        label: `Stufe ${a}–${b}`,
+        onRemove: () =>
+          setFilters((prev) => ({
+            ...prev,
+            skill_min_level: '',
+            skill_max_level: '',
+          })),
+      })
+    }
+
+    ;(filters.visibility_any || []).forEach((id) => {
+      const opt = visibilityOptions.find((o) => String(o.id) === String(id))
+      chips.push({
+        key: `vis-${id}`,
+        label: `Sichtbarkeit: ${opt?.label ?? id}`,
+        onRemove: () =>
+          setFilters((prev) => ({
+            ...prev,
+            visibility_any: prev.visibility_any.filter((x) => String(x) !== String(id)),
+          })),
+      })
+    })
+    ;(filters.status_any || []).forEach((id) => {
+      const opt = statusOptions.find((o) => String(o.id) === String(id))
+      chips.push({
+        key: `st-${id}`,
+        label: `Status: ${opt?.label ?? id}`,
+        onRemove: () =>
+          setFilters((prev) => ({
+            ...prev,
+            status_any: prev.status_any.filter((x) => String(x) !== String(id)),
+          })),
+      })
+    })
+
+    return chips
+  }, [
+    filters,
+    focusOptions,
+    styleOptions,
+    trainingTypeOptions,
+    targetGroupOptions,
+    skillOptions,
+    visibilityOptions,
+    statusOptions,
+  ])
+
   const queryBase = useMemo(() => {
     const q = {}
     const n = (v) => (v === '' || v == null ? undefined : Number(v))
@@ -278,18 +384,37 @@ function ExercisesListPage() {
         <div className="exercise-search-bar__actions">
           <button type="button" className="btn btn-secondary exercise-filter-trigger" onClick={() => setFilterModalOpen(true)}>
             Filter
-            {activeFilterGroups > 0 ? (
+            {filterChips.length > 0 ? (
               <span className="exercise-filter-badge" aria-hidden>
-                {activeFilterGroups}
+                {filterChips.length}
               </span>
             ) : null}
           </button>
-          {activeFilterGroups > 0 ? (
+          {filterChips.length > 0 ? (
             <button type="button" className="btn" onClick={resetAllFilters}>
-              Filter löschen
+              Alle entfernen
             </button>
           ) : null}
         </div>
+        {filterChips.length > 0 ? (
+          <div className="exercise-filter-chips-row" role="list" aria-label="Aktive Filter">
+            {filterChips.map((c) => (
+              <button
+                key={c.key}
+                type="button"
+                role="listitem"
+                className="exercise-filter-chip"
+                title="Filter entfernen"
+                onClick={() => c.onRemove()}
+              >
+                <span className="exercise-filter-chip__text">{c.label}</span>
+                <span className="exercise-filter-chip__x" aria-hidden>
+                  ×
+                </span>
+              </button>
+            ))}
+          </div>
+        ) : null}
         <p style={{ fontSize: '12px', color: 'var(--text3)', marginTop: '10px', marginBottom: 0 }}>
           Vereins-/Trainerfilter folgen später. Fachliche Filter über „Filter“ – zwischen Feldern UND, Auswahl mehrerer Werte je Feld mit ODER.
         </p>
@@ -324,47 +449,55 @@ function ExercisesListPage() {
             </div>
             <div className="admin-modal-sheet__body exercise-filter-modal__scroll">
               <p style={{ fontSize: '13px', color: 'var(--text2)', marginTop: 0, marginBottom: '14px' }}>
-                Zwischen den Bereichen gilt <strong>UND</strong>. Innerhalb eines Bereichs werden mehrere Einträge mit{' '}
-                <strong>ODER</strong> verknüpft (die Übung muss mindestens eine gewählte Zuordnung erfüllen).
+                Zwischen den Bereichen gilt <strong>UND</strong>. Innerhalb eines Feldes werden mehrere Einträge mit{' '}
+                <strong>ODER</strong> verknüpft.
               </p>
-              <div className="exercise-filters-modal-grid">
-                <div>
-                  <label className="form-label">Fokus</label>
-                  <MultiSelectCombo
-                    value={filters.focus_area_ids}
-                    onChange={(v) => setFilters({ ...filters, focus_area_ids: v })}
-                    options={focusOptions}
-                    placeholder="Fokus suchen oder „▼ Alle“ …"
-                  />
+
+              <section className="exercise-filter-section">
+                <h4 className="exercise-filter-section-title">Zuordnung</h4>
+                <div className="exercise-filters-modal-grid">
+                  <div>
+                    <label className="form-label">Fokus</label>
+                    <MultiSelectCombo
+                      value={filters.focus_area_ids}
+                      onChange={(v) => setFilters({ ...filters, focus_area_ids: v })}
+                      options={focusOptions}
+                      placeholder="Fokus suchen oder „▼ Alle“ …"
+                    />
+                  </div>
+                  <div>
+                    <label className="form-label">Stilrichtung</label>
+                    <MultiSelectCombo
+                      value={filters.style_direction_ids}
+                      onChange={(v) => setFilters({ ...filters, style_direction_ids: v })}
+                      options={styleOptions}
+                      placeholder="Stilrichtung suchen …"
+                    />
+                  </div>
+                  <div>
+                    <label className="form-label">Trainingsstil</label>
+                    <MultiSelectCombo
+                      value={filters.training_type_ids}
+                      onChange={(v) => setFilters({ ...filters, training_type_ids: v })}
+                      options={trainingTypeOptions}
+                      placeholder="Trainingsstil suchen …"
+                    />
+                  </div>
+                  <div>
+                    <label className="form-label">Zielgruppe</label>
+                    <MultiSelectCombo
+                      value={filters.target_group_ids}
+                      onChange={(v) => setFilters({ ...filters, target_group_ids: v })}
+                      options={targetGroupOptions}
+                      placeholder="Zielgruppe suchen …"
+                    />
+                  </div>
                 </div>
-                <div>
-                  <label className="form-label">Stilrichtung</label>
-                  <MultiSelectCombo
-                    value={filters.style_direction_ids}
-                    onChange={(v) => setFilters({ ...filters, style_direction_ids: v })}
-                    options={styleOptions}
-                    placeholder="Stilrichtung suchen …"
-                  />
-                </div>
-                <div>
-                  <label className="form-label">Trainingsstil</label>
-                  <MultiSelectCombo
-                    value={filters.training_type_ids}
-                    onChange={(v) => setFilters({ ...filters, training_type_ids: v })}
-                    options={trainingTypeOptions}
-                    placeholder="Trainingsstil suchen …"
-                  />
-                </div>
-                <div>
-                  <label className="form-label">Zielgruppe</label>
-                  <MultiSelectCombo
-                    value={filters.target_group_ids}
-                    onChange={(v) => setFilters({ ...filters, target_group_ids: v })}
-                    options={targetGroupOptions}
-                    placeholder="Zielgruppe suchen …"
-                  />
-                </div>
-                <div>
+              </section>
+
+              <section className="exercise-filter-section">
+                <h4 className="exercise-filter-section-title">Fähigkeit und zugehörige Stufe</h4>
+                <div className="exercise-filter-skill-block">
                   <label className="form-label">Fähigkeit</label>
                   <MultiSelectCombo
                     value={filters.skill_ids}
@@ -372,58 +505,72 @@ function ExercisesListPage() {
                     options={skillOptions}
                     placeholder="Fähigkeit suchen …"
                   />
-                </div>
-                <div className="exercise-filter-level-row">
-                  <div>
-                    <label className="form-label">Fähigkeit Stufe von</label>
-                    <select
-                      className="form-input"
-                      value={filters.skill_min_level}
-                      onChange={(e) => setFilters({ ...filters, skill_min_level: e.target.value })}
-                    >
-                      <option value="">egal</option>
-                      {LEVEL_FILTER_OPTS.map((o) => (
-                        <option key={o.value} value={String(o.level)}>
-                          {o.label}
-                        </option>
-                      ))}
-                    </select>
-                  </div>
-                  <div>
-                    <label className="form-label">bis</label>
-                    <select
-                      className="form-input"
-                      value={filters.skill_max_level}
-                      onChange={(e) => setFilters({ ...filters, skill_max_level: e.target.value })}
-                    >
-                      <option value="">egal</option>
-                      {LEVEL_FILTER_OPTS.map((o) => (
-                        <option key={`m-${o.value}`} value={String(o.level)}>
-                          {o.label}
-                        </option>
-                      ))}
-                    </select>
+                  <p className="exercise-filter-skill-hint">
+                    Die Stufen filtern nach dem Niveau der Zuordnung Übung ↔ Fähigkeit (von–bis).
+                  </p>
+                  <div className="exercise-filter-skill-levels-row">
+                    <label className="exercise-filter-skill-level-field">
+                      <span className="exercise-filter-skill-level-caption">von</span>
+                      <select
+                        className="form-input exercise-filter-level-select"
+                        title="Mindest-Stufe"
+                        value={filters.skill_min_level}
+                        onChange={(e) => setFilters({ ...filters, skill_min_level: e.target.value })}
+                      >
+                        <option value="">–</option>
+                        {LEVEL_FILTER_OPTS.map((o) => (
+                          <option key={o.value} value={String(o.level)} title={o.label}>
+                            {o.level}
+                          </option>
+                        ))}
+                      </select>
+                    </label>
+                    <span className="exercise-filter-skill-dash" aria-hidden>
+                      –
+                    </span>
+                    <label className="exercise-filter-skill-level-field">
+                      <span className="exercise-filter-skill-level-caption">bis</span>
+                      <select
+                        className="form-input exercise-filter-level-select"
+                        title="Höchst-Stufe"
+                        value={filters.skill_max_level}
+                        onChange={(e) => setFilters({ ...filters, skill_max_level: e.target.value })}
+                      >
+                        <option value="">–</option>
+                        {LEVEL_FILTER_OPTS.map((o) => (
+                          <option key={`m-${o.value}`} value={String(o.level)} title={o.label}>
+                            {o.level}
+                          </option>
+                        ))}
+                      </select>
+                    </label>
                   </div>
                 </div>
-                <div>
-                  <label className="form-label">Sichtbarkeit</label>
-                  <MultiSelectCombo
-                    value={filters.visibility_any}
-                    onChange={(v) => setFilters({ ...filters, visibility_any: v })}
-                    options={visibilityOptions}
-                    placeholder="Sichtbarkeit wählen …"
-                  />
+              </section>
+
+              <section className="exercise-filter-section exercise-filter-section--last">
+                <h4 className="exercise-filter-section-title">Freigabe</h4>
+                <div className="exercise-filters-modal-grid exercise-filters-modal-grid--two">
+                  <div>
+                    <label className="form-label">Sichtbarkeit</label>
+                    <MultiSelectCombo
+                      value={filters.visibility_any}
+                      onChange={(v) => setFilters({ ...filters, visibility_any: v })}
+                      options={visibilityOptions}
+                      placeholder="Sichtbarkeit wählen …"
+                    />
+                  </div>
+                  <div>
+                    <label className="form-label">Status</label>
+                    <MultiSelectCombo
+                      value={filters.status_any}
+                      onChange={(v) => setFilters({ ...filters, status_any: v })}
+                      options={statusOptions}
+                      placeholder="Status wählen …"
+                    />
+                  </div>
                 </div>
-                <div>
-                  <label className="form-label">Status</label>
-                  <MultiSelectCombo
-                    value={filters.status_any}
-                    onChange={(v) => setFilters({ ...filters, status_any: v })}
-                    options={statusOptions}
-                    placeholder="Status wählen …"
-                  />
-                </div>
-              </div>
+              </section>
             </div>
             <div className="exercise-filter-modal__footer">
               <button type="button" className="btn" onClick={resetAllFilters}>