chore(version): update version and changelog for release 0.8.124

- Bumped APP_VERSION to 0.8.124 and updated the changelog to reflect recent changes.
- Introduced the ExerciseListBulkToolbar component in ExercisesListPage for improved bulk action handling.
- Enhanced the user interface for selecting and managing exercises in bulk.

backend/version.py

@@ -1,6 +1,6 @@
 # Shinkan Jinkendo Version Information
 
-APP_VERSION = "0.8.123"
+APP_VERSION = "0.8.124"
 BUILD_DATE = "2026-05-12"
 DB_SCHEMA_VERSION = "20260514062"
 
@@ -36,6 +36,13 @@ MODULE_VERSIONS = {
 }
 
 CHANGELOG = [
+    {
+        "version": "0.8.124",
+        "date": "2026-05-13",
+        "changes": [
+            "Frontend Phase 3 (Teil): ExerciseListBulkToolbar-Komponente; Übungsliste nur Verdrahtung.",
+        ],
+    },
     {
         "version": "0.8.123",
         "date": "2026-05-13",

frontend/src/components/exercises/ExerciseListBulkToolbar.jsx

@@ -0,0 +1,27 @@
+import React from 'react'
+
+export default function ExerciseListBulkToolbar({
+  selectedCount,
+  bulkMaxIds,
+  onClearSelection,
+  onOpenBulkModal,
+}) {
+  if (selectedCount < 1) return null
+
+  return (
+    <div className="card exercise-bulk-toolbar">
+      <strong>{selectedCount} ausgewählt</strong>
+      <button type="button" className="btn btn-secondary btn-small" onClick={onClearSelection}>
+        Auswahl aufheben
+      </button>
+      <button type="button" className="btn btn-primary btn-small" onClick={onOpenBulkModal}>
+        Massenänderung…
+      </button>
+      <span className="exercise-bulk-toolbar__meta">
+        Bis zu {bulkMaxIds} pro Anfrage. Für „Verein“ ohne Auswahl: aktiver Vereinskontext (
+        <code>X-Active-Club-Id</code>
+        ).
+      </span>
+    </div>
+  )
+}

frontend/src/pages/ExercisesListPage.jsx

@@ -8,6 +8,7 @@ import ExerciseListCard from '../components/exercises/ExerciseListCard'
 import ExerciseListFilterModal from '../components/exercises/ExerciseListFilterModal'
 import ExerciseListBulkModal from '../components/exercises/ExerciseListBulkModal'
 import ExerciseListSearchBar from '../components/exercises/ExerciseListSearchBar'
+import ExerciseListBulkToolbar from '../components/exercises/ExerciseListBulkToolbar'
 import { buildExerciseListFilterChips } from '../utils/exerciseListFilterChips'
 import { applyDashboardExerciseListUrl, buildExerciseListQueryBase } from '../utils/exerciseListQuery'
 import { useExerciseListCatalogsAndQuery } from '../hooks/useExerciseListCatalogsAndQuery'
@@ -474,22 +475,12 @@ function ExercisesListPage() {
         onToggleSelectAllPage={toggleSelectAllPage}
       />
 
-      {selectedIds.size > 0 ? (
-        <div className="card exercise-bulk-toolbar">
-          <strong>{selectedIds.size} ausgewählt</strong>
-          <button type="button" className="btn btn-secondary btn-small" onClick={clearSelection}>
-            Auswahl aufheben
-          </button>
-          <button type="button" className="btn btn-primary btn-small" onClick={openBulkModal}>
-            Massenänderung…
-          </button>
-          <span className="exercise-bulk-toolbar__meta">
-            Bis zu {BULK_MAX_IDS} pro Anfrage. Für „Verein“ ohne Auswahl: aktiver Vereinskontext (
-            <code>X-Active-Club-Id</code>
-            ).
-          </span>
-        </div>
-      ) : null}
+      <ExerciseListBulkToolbar
+        selectedCount={selectedIds.size}
+        bulkMaxIds={BULK_MAX_IDS}
+        onClearSelection={clearSelection}
+        onOpenBulkModal={openBulkModal}
+      />
 
       <ExerciseListFilterModal
         open={filterModalOpen}