feat(exercise-detail): enhance combination exercise display with candidate links and bracket visualization

- Introduced `flattenCombinationCandidateLinks` function to streamline the extraction of unique candidate exercises for combination details.
- Updated the `ExerciseDetailPage` to conditionally render a `CombinationPlanBracket` for combination exercises, improving the visual representation of training runs.
- Enhanced the UI to display linked individual exercises associated with combination slots, providing clearer navigation and context for users.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/pages/ExerciseDetailPage.jsx

@@ -3,6 +3,7 @@ import { Link, useNavigate, useParams, useLocation } from 'react-router-dom'
 import api from '../utils/api'
 import ExerciseRichTextBlock from '../components/ExerciseRichTextBlock'
 import ExerciseAttachmentMediaStrip from '../components/ExerciseAttachmentMediaStrip'
+import CombinationPlanBracket from '../components/CombinationPlanBracket'
 import { formatSkillLevelSlug } from '../constants/skillLevels'
 import { sortCombinationSlotsForDisplay } from '../constants/combinationArchetypes'
 
@@ -51,6 +52,28 @@ function metaParts(exercise) {
   return parts
 }
 
+/** Eindeutige Kandidaten-Übungen für Schnellnavigation unter der Klammerdarstellung */
+function flattenCombinationCandidateLinks(slots) {
+  const rows = []
+  const seen = new Set()
+  sortCombinationSlotsForDisplay(slots || []).forEach((s) => {
+    const cands =
+      s.candidates && s.candidates.length
+        ? s.candidates
+        : (s.candidate_exercise_ids || []).map((id) => ({
+            exercise_id: id,
+            title: null,
+          }))
+    cands.forEach((c) => {
+      const eid = c.exercise_id
+      if (eid == null || seen.has(eid)) return
+      seen.add(eid)
+      rows.push({ exercise_id: eid, title: (c.title || '').trim() || null })
+    })
+  })
+  return rows
+}
+
 function ExerciseDetailPage() {
   const { id } = useParams()
   const navigate = useNavigate()
@@ -108,6 +131,20 @@ function ExerciseDetailPage() {
   const meta = metaParts(exercise)
   const fromExerciseEdit = location.state?.fromExerciseEdit === true
 
+  const isCombinationDetail =
+    (exercise.exercise_kind || '').toLowerCase().trim() === 'combination' &&
+    Array.isArray(exercise.combination_slots) &&
+    exercise.combination_slots.length > 0
+  const combinationCandidateLinks = isCombinationDetail
+    ? flattenCombinationCandidateLinks(exercise.combination_slots)
+    : []
+  const catalogMethodProfileForBracket =
+    exercise.method_profile &&
+    typeof exercise.method_profile === 'object' &&
+    !Array.isArray(exercise.method_profile)
+      ? exercise.method_profile
+      : {}
+
   return (
     <div className="exercise-detail-shell" style={{ padding: '12px 12px 24px' }}>
       <div style={{ marginBottom: '12px', display: 'flex', justifyContent: 'space-between', gap: '8px', flexWrap: 'wrap', alignItems: 'center' }}>
@@ -137,39 +174,34 @@ function ExerciseDetailPage() {
         {meta.length > 0 && <p className="exercise-meta-line">{meta.join(' · ')}</p>}
       </div>
 
-      {(exercise.exercise_kind || '').toLowerCase().trim() === 'combination' &&
-        Array.isArray(exercise.combination_slots) &&
-        exercise.combination_slots.length > 0 && (
+      {isCombinationDetail ? (
         <section className="card exercise-detail-section">
-            <h2>Stationen und Übungspools</h2>
-            {exercise.method_archetype ? (
-              <p style={{ fontSize: '14px', color: 'var(--text2)', marginTop: 0 }}>
-                Archetyp: <code>{String(exercise.method_archetype)}</code>
+          <h2>Ablauf und Stationen</h2>
+          <p style={{ marginTop: 0, fontSize: '0.88rem', color: 'var(--text2)', lineHeight: 1.45 }}>
+            Katalog‑Ablauf mit Archetyp, Zeiten und Stationen — dieselbe Darstellung wie in der Planung und Vorschau.
           </p>
-            ) : null}
-            <ol style={{ paddingLeft: '1.25rem', marginBottom: 0 }}>
-              {sortCombinationSlotsForDisplay(exercise.combination_slots).map((s, idx) => (
-                <li key={`${s.slot_index}-${idx}-${(s.title || '').slice(0, 8)}`} style={{ marginBottom: '10px' }}>
-                  <strong>{(s.title || '').trim() || `Station ${idx + 1}`}</strong>
-                  <ul style={{ margin: '4px 0 0', paddingLeft: '1.2rem' }}>
-                    {(s.candidates && s.candidates.length
-                      ? s.candidates
-                      : (s.candidate_exercise_ids || []).map((id) => ({
-                          exercise_id: id,
-                          title: null,
-                        }))
-                    ).map((c) => (
+          <div className="training-run-combo-embed">
+            <CombinationPlanBracket
+              methodArchetype={String(exercise.method_archetype || '').trim()}
+              methodProfile={catalogMethodProfileForBracket}
+              combinationSlots={exercise.combination_slots}
+              planningAdjusted={false}
+            />
+          </div>
+          {combinationCandidateLinks.length > 0 ? (
+            <div style={{ marginTop: '14px', fontSize: '0.88rem' }}>
+              <div style={{ fontWeight: 600, marginBottom: '6px', color: 'var(--text2)' }}>Verknüpfte Einzelübungen</div>
+              <ul style={{ margin: 0, paddingLeft: '1.2rem' }}>
+                {combinationCandidateLinks.map((c) => (
                   <li key={c.exercise_id}>
-                        <Link to={`/exercises/${c.exercise_id}`}>Übung #{c.exercise_id}</Link>
-                        {c.title ? ` — ${c.title}` : ''}
+                    <Link to={`/exercises/${c.exercise_id}`}>{c.title || `Übung #${c.exercise_id}`}</Link>
                   </li>
                 ))}
               </ul>
-                </li>
-              ))}
-            </ol>
+            </div>
+          ) : null}
         </section>
-        )}
+      ) : null}
 
       {exercise.goal && (
         <section className="card exercise-detail-section">