frontend/src/app.css

@@ -6398,6 +6398,68 @@ a.analysis-split__nav-item {
   color: var(--text3);
   margin-right: 6px;
 }
+.combo-plan-bracket__station-exercises--interactive {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: baseline;
+  gap: 4px 6px;
+}
+.combo-plan-bracket__cand-inline {
+  display: inline-flex;
+  align-items: baseline;
+  gap: 4px;
+}
+.combo-plan-bracket__cand-sep {
+  color: var(--text3);
+  font-size: 0.78rem;
+  user-select: none;
+}
+.combo-plan-bracket__cand-btn {
+  margin: 0;
+  padding: 2px 8px;
+  font: inherit;
+  font-size: 0.84rem;
+  font-weight: 600;
+  color: var(--accent-dark);
+  background: var(--surface);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  cursor: pointer;
+  text-align: left;
+  line-height: 1.35;
+}
+.combo-plan-bracket__cand-btn:hover {
+  border-color: var(--accent);
+  background: var(--surface2);
+}
+.combo-plan-bracket__cand-link {
+  font-size: 0.84rem;
+  font-weight: 600;
+  color: var(--accent-dark);
+  text-decoration: underline;
+  text-underline-offset: 2px;
+}
+.combo-plan-bracket__cand-link:hover {
+  color: var(--accent);
+}
+
+button.combo-coach-cand-link {
+  margin: 0;
+  padding: 0;
+  border: none;
+  background: none;
+  font: inherit;
+  font-size: 0.84rem;
+  font-weight: 600;
+  color: var(--accent);
+  text-decoration: underline;
+  cursor: pointer;
+  text-align: left;
+}
+button.combo-coach-cand-link:hover {
+  color: var(--accent-dark);
+}
+
 .training-run-combo-embed {
   margin-top: 0.65rem;
 }

frontend/src/components/CombinationCoachSlots.jsx

@@ -35,17 +35,28 @@ export default function CombinationCoachSlots({
   methodProfile,
   compactPlanningView = false,
   omitGlobalKeyValueBlock = false,
+  /** Wenn gesetzt: Kandidaten als Button → Peek (kein Router-Wechsel, PWA-sicher) */
+  onOpenCandidatePeek,
 }) {
   const slots = useMemo(() => sortCombinationSlotsForDisplay(combinationSlots), [combinationSlots])
 
   const candidateIds = useMemo(() => {
     const set = new Set()
     for (const s of slots) {
+      if (Array.isArray(s.candidates) && s.candidates.length) {
+        for (const c of s.candidates) {
+          const raw = c.exercise_id
+          if (raw == null) continue
+          const n = typeof raw === 'number' ? raw : parseInt(String(raw), 10)
+          if (Number.isFinite(n)) set.add(n)
+        }
+      } else {
         for (const id of s.candidate_exercise_ids || []) {
           const n = typeof id === 'number' ? id : parseInt(String(id), 10)
           if (Number.isFinite(n)) set.add(n)
         }
       }
+    }
     return [...set]
   }, [slots])
 
@@ -282,9 +293,19 @@ export default function CombinationCoachSlots({
                               <>
                                 <p style={{ margin: '0 0 4px', fontSize: '0.96rem', fontWeight: 700 }}>{ex.title}</p>
                                 <p style={{ margin: 0 }}>
+                                  {typeof onOpenCandidatePeek === 'function' ? (
+                                    <button
+                                      type="button"
+                                      className="combo-coach-cand-link"
+                                      onClick={() => onOpenCandidatePeek(cid)}
+                                    >
+                                      Details anzeigen
+                                    </button>
+                                  ) : (
                                     <Link to={`/exercises/${cid}`} style={{ fontSize: '0.82rem', color: 'var(--accent)' }}>
                                       Im Katalog öffnen
                                     </Link>
+                                  )}
                                 </p>
                               </>
                             ) : (
@@ -320,9 +341,19 @@ export default function CombinationCoachSlots({
                                 </details>
                               ) : null}
                               <p style={{ marginTop: '8px', marginBottom: 0 }}>
+                                {typeof onOpenCandidatePeek === 'function' ? (
+                                  <button
+                                    type="button"
+                                    className="combo-coach-cand-link"
+                                    onClick={() => onOpenCandidatePeek(cid)}
+                                  >
+                                    Volle Übungsansicht
+                                  </button>
+                                ) : (
                                   <Link to={`/exercises/${cid}`} style={{ fontSize: '0.84rem', color: 'var(--accent)' }}>
                                     Volle Übungsseite
                                   </Link>
+                                )}
                               </p>
                             </>
                             )

frontend/src/components/CombinationPlanBracket.jsx

@@ -2,6 +2,7 @@
  * Kombination: konsolidierte Darstellung globales Profil + Stationen mit Zeiten (Vorschau, Plan-Ansicht, Druck).
  */
 import React, { useMemo } from 'react'
+import { Link } from 'react-router-dom'
 import {
   archetypeCoachHint,
   combinationArchetypeLabel,
@@ -14,24 +15,22 @@ import {
   stationPrimaryLoadLabel,
 } from '../utils/combinationMethodProfileUi'
 
-function candidateLine(slot) {
+/** @returns {{ exerciseId: number, label: string }[]} */
-  const cands = slot.candidates
+export function normalizeCombinationSlotCandidates(slot) {
-  if (Array.isArray(cands) && cands.length > 0) {
+  const out = []
-    return cands
+  const cands =
-      .map((c) =>
+    slot.candidates && slot.candidates.length
-        ((c.title || '').trim() || (c.exercise_id != null ? `Übung #${c.exercise_id}` : '')).trim(),
+      ? slot.candidates
-      )
+      : (slot.candidate_exercise_ids || []).map((id) => ({ exercise_id: id, title: null }))
-      .filter(Boolean)
+  for (const c of cands) {
-      .join(' ↔ ')
+    const rawId = c.exercise_id
+    if (rawId == null) continue
+    const n = typeof rawId === 'number' ? rawId : parseInt(String(rawId), 10)
+    if (!Number.isFinite(n)) continue
+    const label = ((c.title || '').trim() || `Übung #${n}`).trim()
+    out.push({ exerciseId: n, label })
   }
-  const ids = slot.candidate_exercise_ids || []
+  return out
-  return ids
-    .map((raw) => {
-      const n = typeof raw === 'number' ? raw : parseInt(String(raw), 10)
-      return Number.isFinite(n) ? `Übung #${n}` : ''
-    })
-    .filter(Boolean)
-    .join(' ↔ ')
 }
 
 export default function CombinationPlanBracket({
@@ -39,6 +38,9 @@ export default function CombinationPlanBracket({
   methodProfile,
   combinationSlots,
   planningAdjusted = false,
+  /** 'none' | 'link' (Router) | 'button' (z. B. ExercisePeekModal / PWA-sicher) */
+  candidateInteraction = 'none',
+  onCandidatePeek,
 }) {
   const arch = typeof methodArchetype === 'string' ? methodArchetype.trim() : ''
   const archLabel = arch ? combinationArchetypeLabel(arch) : null
@@ -97,7 +99,8 @@ export default function CombinationPlanBracket({
             const stationIx = Number.isFinite(ixParsed) ? ixParsed : si
             const displayStep = si + 1
             const stationTitle = ((slot.title || '').trim() || `Station ${displayStep}`).trim()
-            const names = candidateLine(slot)
+            const candRows = normalizeCombinationSlotCandidates(slot)
+            const names = candRows.length ? candRows.map((r) => r.label).join(' ↔ ') : ''
             const slotProfRow = timingByIx.get(stationIx)
             const loadBadge = stationPrimaryLoadLabel(slotProfRow)
             const timing = effectiveStationTimingSummary(arch, methodProfile || {}, slotProfRow)
@@ -112,7 +115,35 @@ export default function CombinationPlanBracket({
                 </div>
                 <div className="combo-plan-bracket__station-main">
                   <div className="combo-plan-bracket__station-title">{stationTitle}</div>
+                  {candidateInteraction === 'button' && typeof onCandidatePeek === 'function' && candRows.length > 0 ? (
+                    <div className="combo-plan-bracket__station-exercises combo-plan-bracket__station-exercises--interactive">
+                      {candRows.map((c, ci) => (
+                        <span key={`${c.exerciseId}-${ci}`} className="combo-plan-bracket__cand-inline">
+                          {ci > 0 ? <span className="combo-plan-bracket__cand-sep">↔</span> : null}
+                          <button
+                            type="button"
+                            className="combo-plan-bracket__cand-btn"
+                            onClick={() => onCandidatePeek(c.exerciseId, c.label)}
+                          >
+                            {c.label}
+                          </button>
+                        </span>
+                      ))}
+                    </div>
+                  ) : candidateInteraction === 'link' && candRows.length > 0 ? (
+                    <div className="combo-plan-bracket__station-exercises combo-plan-bracket__station-exercises--interactive">
+                      {candRows.map((c, ci) => (
+                        <span key={`${c.exerciseId}-${ci}`} className="combo-plan-bracket__cand-inline">
+                          {ci > 0 ? <span className="combo-plan-bracket__cand-sep">↔</span> : null}
+                          <Link to={`/exercises/${c.exerciseId}`} className="combo-plan-bracket__cand-link">
+                            {c.label}
+                          </Link>
+                        </span>
+                      ))}
+                    </div>
+                  ) : (
                     <div className="combo-plan-bracket__station-exercises">{names || '(keine Einzelübung)'}</div>
+                  )}
                   {timing ? (
                     <div className="combo-plan-bracket__station-timing">
                       <span className="combo-plan-bracket__timing-label">Zeit / Steuerung</span>

frontend/src/components/ExerciseFullContent.jsx

@@ -54,9 +54,18 @@ function metaParts(exercise) {
 }
 
 /**
- * @param {{ exercise?: object|null, loading?: boolean, error?: string|null, exerciseId?: number, variantId?: number|string|null, planningComboMethodProfile?: object|null, catalogMethodProfileSnapshot?: object|null }} props
+ * @param {{ exercise?: object|null, loading?: boolean, error?: string|null, exerciseId?: number, variantId?: number|string|null, planningComboMethodProfile?: object|null, catalogMethodProfileSnapshot?: object|null, onCandidateExercisePeek?: (exerciseId: number) => void }} props
  */
-export default function ExerciseFullContent({ exercise, loading, error, exerciseId, variantId, planningComboMethodProfile, catalogMethodProfileSnapshot }) {
+export default function ExerciseFullContent({
+  exercise,
+  loading,
+  error,
+  exerciseId,
+  variantId,
+  planningComboMethodProfile,
+  catalogMethodProfileSnapshot,
+  onCandidateExercisePeek,
+}) {
   if (loading) {
     return (
       <div style={{ textAlign: 'center', padding: '1rem' }}>
@@ -129,6 +138,7 @@ export default function ExerciseFullContent({ exercise, loading, error, exercise
           combinationSlots={exercise.combination_slots}
           methodArchetype={exercise.method_archetype}
           methodProfile={coachComboProfile}
+          onOpenCandidatePeek={onCandidateExercisePeek}
         />
       ) : null}
       <h2 style={{ margin: '0 0 8px', fontSize: '1.2rem', lineHeight: 1.35 }}>{exercise.title}</h2>

frontend/src/components/ExercisePeekModal.jsx

@@ -1,7 +1,8 @@
 /**
  * Schnellansicht einer Übung aus dem Katalog (ohne die Planungsseite zu verlassen).
+ * Unterstützt Drill-down zu Kandidaten-Übungen bei Kombinationen inkl. „Zurück“ (PWA-sicher).
  */
-import React, { useEffect, useMemo, useState } from 'react'
+import React, { useEffect, useMemo, useRef, useState } from 'react'
 import { Link } from 'react-router-dom'
 import api from '../utils/api'
 import ExerciseRichTextBlock from './ExerciseRichTextBlock'
@@ -25,6 +26,8 @@ function TagMini({ exercise }) {
   )
 }
 
+/** @typedef {{ exerciseId: number, variantId?: number | null, peekExtras?: object | null }} PeekStackEntry */
+
 export default function ExercisePeekModal({
   open,
   exerciseId,
@@ -37,36 +40,37 @@ export default function ExercisePeekModal({
   const [loading, setLoading] = useState(false)
   const [err, setErr] = useState(null)
   const [exercise, setExercise] = useState(null)
+  /** @type {[PeekStackEntry[], React.Dispatch<React.SetStateAction<PeekStackEntry[]>>]} */
+  const [stack, setStack] = useState([])
 
-  const variant =
+  /** @type {React.MutableRefObject<boolean>} */
-    variantId != null && variantId !== '' && exercise?.variants?.length
+  const wasOpenRef = useRef(false)
-      ? exercise.variants.find((v) => String(v.id) === String(variantId)) || null
-      : null
-
-  const isCombination =
-    exercise &&
-    String(exercise.exercise_kind || 'simple').toLowerCase().trim() === 'combination'
-
-  const comboMethodProfileEffective = useMemo(() => {
-    if (!exercise || !isCombination) return {}
-    const fromPeek =
-      peekExtras?.catalog_method_profile &&
-      typeof peekExtras.catalog_method_profile === 'object' &&
-      !Array.isArray(peekExtras.catalog_method_profile) &&
-      Object.keys(peekExtras.catalog_method_profile).length > 0
-        ? peekExtras.catalog_method_profile
-        : exercise.method_profile || {}
-    return effectiveComboMethodProfile(fromPeek, peekExtras?.planning_method_profile ?? null)
-  }, [exercise, isCombination, peekExtras])
 
   useEffect(() => {
     if (!open) {
-      setExercise(null)
+      setStack([])
-      setErr(null)
+      wasOpenRef.current = false
       return
     }
-    if (!exerciseId) {
+    if (exerciseId == null || exerciseId === '') return
-      setErr('Keine Übung gewählt')
+    if (!wasOpenRef.current) {
+      wasOpenRef.current = true
+      setStack([
+        {
+          exerciseId: Number(exerciseId),
+          variantId: variantId ?? null,
+          peekExtras: peekExtras ?? null,
+        },
+      ])
+    }
+  }, [open, exerciseId, variantId, peekExtras])
+
+  const top = stack.length ? stack[stack.length - 1] : null
+
+  useEffect(() => {
+    if (!open || !top?.exerciseId) {
+      setExercise(null)
+      setErr(null)
       return
     }
     let cancelled = false
@@ -74,7 +78,7 @@ export default function ExercisePeekModal({
       setLoading(true)
       setErr(null)
       try {
-        const data = await api.getExercise(exerciseId)
+        const data = await api.getExercise(top.exerciseId)
         if (!cancelled) setExercise(data)
       } catch (e) {
         if (!cancelled) setErr(e.message || 'Laden fehlgeschlagen')
@@ -85,7 +89,40 @@ export default function ExercisePeekModal({
     return () => {
       cancelled = true
     }
-  }, [open, exerciseId, variantId])
+  }, [open, top?.exerciseId])
+
+  const variant =
+    top?.variantId != null &&
+    top.variantId !== '' &&
+    exercise?.variants?.length
+      ? exercise.variants.find((v) => String(v.id) === String(top.variantId)) || null
+      : null
+
+  const isCombination =
+    exercise && String(exercise.exercise_kind || 'simple').toLowerCase().trim() === 'combination'
+
+  const comboMethodProfileEffective = useMemo(() => {
+    if (!exercise || !isCombination) return {}
+    const fromPeek =
+      top?.peekExtras?.catalog_method_profile &&
+      typeof top.peekExtras.catalog_method_profile === 'object' &&
+      !Array.isArray(top.peekExtras.catalog_method_profile) &&
+      Object.keys(top.peekExtras.catalog_method_profile).length > 0
+        ? top.peekExtras.catalog_method_profile
+        : exercise.method_profile || {}
+    return effectiveComboMethodProfile(fromPeek, top?.peekExtras?.planning_method_profile ?? null)
+  }, [exercise, isCombination, top?.peekExtras])
+
+  const planningAdjustedBadge =
+    top?.peekExtras?.planning_method_profile != null &&
+    typeof top.peekExtras.planning_method_profile === 'object' &&
+    !Array.isArray(top.peekExtras.planning_method_profile)
+
+  const pushCandidatePeek = (id) => {
+    const n = Number(id)
+    if (!Number.isFinite(n)) return
+    setStack((s) => [...s, { exerciseId: n, variantId: null, peekExtras: null }])
+  }
 
   if (!open) return null
 
@@ -107,9 +144,19 @@ export default function ExercisePeekModal({
         }}
         onClick={(e) => e.stopPropagation()}
       >
-        <div className="admin-modal-sheet__header">
+        <div className="admin-modal-sheet__header" style={{ gap: '8px', flexWrap: 'wrap' }}>
-          <h3 id="exercise-peek-title" className="admin-modal-sheet__title">
+          {stack.length > 1 ? (
-            {loading ? '…' : exercise?.title || titleFallback || `Übung #${exerciseId}`}
+            <button
+              type="button"
+              className="btn btn-secondary"
+              style={{ flexShrink: 0, fontWeight: 600 }}
+              onClick={() => setStack((s) => (s.length > 1 ? s.slice(0, -1) : s))}
+            >
+              ← Zurück
+            </button>
+          ) : null}
+          <h3 id="exercise-peek-title" className="admin-modal-sheet__title" style={{ flex: '1 1 200px', minWidth: 0 }}>
+            {loading ? '…' : exercise?.title || titleFallback || (top?.exerciseId != null ? `Übung #${top.exerciseId}` : 'Übung')}
           </h3>
           <button type="button" className="btn btn-secondary admin-modal-sheet__close" onClick={onClose}>
             Schließen
@@ -130,14 +177,10 @@ export default function ExercisePeekModal({
                   <CombinationPlanBracket
                     methodArchetype={exercise.method_archetype || ''}
                     methodProfile={comboMethodProfileEffective}
-                    combinationSlots={
+                    combinationSlots={Array.isArray(exercise.combination_slots) ? exercise.combination_slots : []}
-                      Array.isArray(exercise.combination_slots) ? exercise.combination_slots : []
+                    planningAdjusted={planningAdjustedBadge}
-                    }
+                    candidateInteraction="button"
-                    planningAdjusted={
+                    onCandidatePeek={pushCandidatePeek}
-                      peekExtras?.planning_method_profile != null &&
-                      typeof peekExtras.planning_method_profile === 'object' &&
-                      !Array.isArray(peekExtras.planning_method_profile)
-                    }
                   />
                   <hr style={{ border: 'none', borderTop: '1px solid var(--border)', margin: '1rem 0' }} />
                 </>
@@ -210,13 +253,17 @@ export default function ExercisePeekModal({
             </>
           )}
         </div>
-        {exerciseId && (
+        {top?.exerciseId != null ? (
           <div style={{ padding: '0 1rem 1rem', flexShrink: 0 }}>
-            <Link to={`/exercises/${exerciseId}`} className="btn btn-secondary" style={{ width: '100%', textDecoration: 'none', textAlign: 'center', display: 'block' }}>
+            <Link
+              to={`/exercises/${top.exerciseId}`}
+              className="btn btn-secondary"
+              style={{ width: '100%', textDecoration: 'none', textAlign: 'center', display: 'block' }}
+            >
               Vollständige Übungsseite öffnen
             </Link>
           </div>
-        )}
+        ) : null}
       </div>
     </div>
   )

frontend/src/components/TrainingUnitSectionsEditor.jsx

@@ -1596,6 +1596,12 @@ export default function TrainingUnitSectionsEditor({
                       typeof comboPlanningModalItem.planning_method_profile === 'object' &&
                       !Array.isArray(comboPlanningModalItem.planning_method_profile)
                     }
+                    candidateInteraction={onPeekExercise ? 'button' : 'none'}
+                    onCandidatePeek={
+                      onPeekExercise
+                        ? (exId) => onPeekExercise(Number(exId), null, undefined)
+                        : undefined
+                    }
                   />
                 </div>
               ) : (

frontend/src/pages/ExerciseDetailPage.jsx

@@ -5,7 +5,6 @@ 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'
 
 function TagRow({ exercise }) {
   const tags = []
@@ -52,28 +51,6 @@ 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()
@@ -135,9 +112,6 @@ function ExerciseDetailPage() {
     (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' &&
@@ -186,20 +160,9 @@ function ExerciseDetailPage() {
               methodProfile={catalogMethodProfileForBracket}
               combinationSlots={exercise.combination_slots}
               planningAdjusted={false}
+              candidateInteraction="link"
             />
           </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/${c.exercise_id}`}>{c.title || `Übung #${c.exercise_id}`}</Link>
-                  </li>
-                ))}
-              </ul>
-            </div>
-          ) : null}
         </section>
       ) : null}
 

frontend/src/pages/TrainingCoachPage.jsx

@@ -5,6 +5,7 @@ import React, { useCallback, useEffect, useMemo, useState } from 'react'
 import { Link, useNavigate, useParams } from 'react-router-dom'
 import api from '../utils/api'
 import ExerciseFullContent from '../components/ExerciseFullContent'
+import ExercisePeekModal from '../components/ExercisePeekModal'
 import {
   flattenPlanTimeline,
   itemStableKey,
@@ -178,6 +179,7 @@ export default function TrainingCoachPage() {
   const [trainerAppend, setTrainerAppend] = useState('')
   const [saveMarkDone, setSaveMarkDone] = useState(true)
   const [saving, setSaving] = useState(false)
+  const [candidatePeekId, setCandidatePeekId] = useState(null)
   const [saveOk, setSaveOk] = useState(null)
 
   const reloadUnit = useCallback(async () => {
@@ -460,6 +462,12 @@ export default function TrainingCoachPage() {
 
   return (
     <div className="training-coach-page training-coach-layout">
+      <ExercisePeekModal
+        key={candidatePeekId != null ? String(candidatePeekId) : 'coach-peek-closed'}
+        open={candidatePeekId != null}
+        exerciseId={candidatePeekId}
+        onClose={() => setCandidatePeekId(null)}
+      />
       <nav
         className="no-print training-coach-meta-nav"
         style={{
@@ -750,6 +758,7 @@ export default function TrainingCoachPage() {
                         ? currentEntry?.item?.planning_method_profile ?? null
                         : null
                     }
+                    onCandidateExercisePeek={(id) => setCandidatePeekId(id)}
                   />
                 </div>
               </>

frontend/src/pages/TrainingFrameworkProgramEditPage.jsx

@@ -1223,6 +1223,7 @@ export default function TrainingFrameworkProgramEditPage() {
       />
 
       <ExercisePeekModal
+        key={peekCtx != null ? String(peekCtx.exerciseId) : 'fw-peek-closed'}
         open={peekCtx != null}
         exerciseId={peekCtx?.exerciseId || 0}
         variantId={peekCtx?.variantId ?? undefined}

frontend/src/pages/TrainingPlanningPage.jsx

@@ -3087,6 +3087,7 @@ function TrainingPlanningPage() {
         }}
       />
       <ExercisePeekModal
+        key={planningPeekCtx != null ? String(planningPeekCtx.exerciseId) : 'plan-peek-closed'}
         open={planningPeekCtx != null}
         exerciseId={planningPeekCtx?.exerciseId}
         variantId={planningPeekCtx?.variantId ?? undefined}