Enhance TrainingCoachPage and TrainingUnitRunPage with improved coach focus handling and UI updates

- Updated TrainingCoachPage to incorporate coach focus parameters from search queries, allowing for more precise control over displayed training streams.
- Refactored session storage handling to better manage state related to coach focus, ensuring accurate step tracking during training sessions.
- Enhanced TrainingUnitRunPage with improved layout for stream titles and added links for direct navigation to coaching views, improving user experience.
- Introduced new utility functions in trainingPlanUtils for managing coach stream focus options and duration overrides, streamlining data handling across components.

frontend/src/pages/TrainingCoachPage.jsx

@@ -2,20 +2,23 @@
  * Coach-Modus: eine Position nach der anderen mit Assistentenhinweisen, Zeitnahme und optionaler Nachbereitung.
  * Timeline: flach in Phasen-/Stream-Reihenfolge (flattenPlanTimeline).
  */
-import React, { useCallback, useEffect, useMemo, useState } from 'react'
-import { Link, useNavigate, useParams } from 'react-router-dom'
+import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react'
+import { Link, useNavigate, useParams, useSearchParams } from 'react-router-dom'
 import api from '../utils/api'
 import ExerciseFullContent from '../components/ExerciseFullContent'
 import ExercisePeekModal from '../components/ExercisePeekModal'
 import {
+  durationOverridesMapFromDeltas,
   flattenPlanTimeline,
   itemStableKey,
+  listCoachStreamFocusOptions,
   sectionsToPutPayload,
   summarizeTimelineEntry,
 } from '../utils/trainingPlanUtils'
 
-function storageStepKey(unitId) {
-  return `sj_coach_step_${unitId}`
+function storageStepKey(unitId, coachFocus) {
+  if (coachFocus == null) return `sj_coach_step_${unitId}_full`
+  return `sj_coach_step_${unitId}_po${coachFocus.phaseOrder}-so${coachFocus.streamOrder}`
 }
 
 function storageDeltasKey(unitId) {
@@ -156,8 +159,11 @@ function CoachControlsBand({
 export default function TrainingCoachPage() {
   const { unitId } = useParams()
   const navigate = useNavigate()
+  const [searchParams, setSearchParams] = useSearchParams()
   const idNum = unitId ? parseInt(unitId, 10) : NaN
 
+  const coachFocusResetRef = useRef(null)
+
   const [unit, setUnit] = useState(null)
   const [loadError, setLoadError] = useState(null)
   const [loading, setLoading] = useState(true)
@@ -188,12 +194,35 @@ export default function TrainingCoachPage() {
     setUnit(u)
   }, [idNum])
 
+  const coachFocus = useMemo(() => {
+    const poRaw = searchParams.get('po')
+    const soRaw = searchParams.get('so')
+    if (poRaw == null || poRaw === '' || soRaw == null || soRaw === '') return null
+    const po = parseInt(poRaw, 10)
+    const so = parseInt(soRaw, 10)
+    if (!Number.isFinite(po) || !Number.isFinite(so)) return null
+    if (!unit) return null
+    const opts = listCoachStreamFocusOptions(unit)
+    if (!opts.some((o) => o.phaseOrder === po && o.streamOrder === so)) return null
+    return { phaseOrder: po, streamOrder: so }
+  }, [searchParams, unit])
+
+  const streamFocusOptions = useMemo(() => (unit ? listCoachStreamFocusOptions(unit) : []), [unit])
+
+  const focusKey = coachFocus ? `${coachFocus.phaseOrder}-${coachFocus.streamOrder}` : 'full'
+
+  const hasStreamSelectParams =
+    (searchParams.get('po') != null && searchParams.get('po') !== '') ||
+    (searchParams.get('so') != null && searchParams.get('so') !== '')
+  const streamParamsInvalid = Boolean(unit && hasStreamSelectParams && !coachFocus)
+
   useEffect(() => {
     if (!unitId || Number.isNaN(idNum)) {
       setLoadError('Ungültige Trainingseinheit')
       setLoading(false)
       return
     }
+    coachFocusResetRef.current = null
     let cancelled = false
     ;(async () => {
       setLoading(true)
@@ -201,12 +230,6 @@ export default function TrainingCoachPage() {
       try {
         await reloadUnit()
         if (cancelled) return
-        try {
-          const s = parseInt(sessionStorage.getItem(storageStepKey(idNum)), 10)
-          if (!Number.isNaN(s) && s >= 0) setStep(s)
-        } catch {
-          /* ignore */
-        }
         try {
           const raw = sessionStorage.getItem(storageDeltasKey(idNum))
           if (raw) {
@@ -233,8 +256,26 @@ export default function TrainingCoachPage() {
   }, [unitId, idNum, reloadUnit])
 
   useEffect(() => {
-    sessionStorage.setItem(storageStepKey(idNum), String(step))
-  }, [idNum, step])
+    if (!unit) return
+    const po = searchParams.get('po')
+    const so = searchParams.get('so')
+    if ((po == null || po === '') && (so == null || so === '')) return
+    const p = parseInt(po, 10)
+    const s = parseInt(so, 10)
+    if (!Number.isFinite(p) || !Number.isFinite(s)) {
+      setSearchParams({}, { replace: true })
+      return
+    }
+    const opts = listCoachStreamFocusOptions(unit)
+    if (opts.length === 0 || !opts.some((o) => o.phaseOrder === p && o.streamOrder === s)) {
+      setSearchParams({}, { replace: true })
+    }
+  }, [unit, searchParams, setSearchParams])
+
+  useEffect(() => {
+    if (Number.isNaN(idNum)) return
+    sessionStorage.setItem(storageStepKey(idNum, coachFocus), String(step))
+  }, [idNum, coachFocus, step])
 
   useEffect(() => {
     try {
@@ -258,11 +299,17 @@ export default function TrainingCoachPage() {
     return () => clearInterval(iv)
   }, [runStartAt])
 
-  const timeline = useMemo(() => flattenPlanTimeline(unit), [unit])
+  const timeline = useMemo(() => flattenPlanTimeline(unit, coachFocus), [unit, coachFocus])
 
   const clampStep = (s, len = timeline.length) =>
     Math.max(0, Math.min(s, Math.max(len - 1, 0)))
 
+  const timerReset = useCallback(() => {
+    setRunStartAt(null)
+    setPausedAccumMs(0)
+    setTimerOwningStep(null)
+  }, [])
+
   useEffect(() => {
     if (!unit) return
     if (timeline.length === 0) {
@@ -278,6 +325,33 @@ export default function TrainingCoachPage() {
     setStep(timeline.length - 1)
   }, [coachDebriefPhase, unit, timeline.length])
 
+  useEffect(() => {
+    if (!unit || Number.isNaN(idNum)) return
+    if (timeline.length === 0) {
+      setStep(0)
+      return
+    }
+    const prev = coachFocusResetRef.current
+    if (prev === null) {
+      coachFocusResetRef.current = focusKey
+    } else if (prev !== focusKey) {
+      coachFocusResetRef.current = focusKey
+      setCoachDebriefPhase(false)
+      timerReset()
+    } else {
+      return
+    }
+    try {
+      const raw = sessionStorage.getItem(storageStepKey(idNum, coachFocus))
+      const s = parseInt(raw, 10)
+      const maxIdx = Math.max(0, timeline.length - 1)
+      if (!Number.isNaN(s) && s >= 0) setStep(Math.min(s, maxIdx))
+      else setStep(0)
+    } catch {
+      setStep(0)
+    }
+  }, [unit, idNum, focusKey, coachFocus, timeline.length, timerReset])
+
   const elapsedMs =
     pausedAccumMs + (runStartAt != null ? Date.now() - runStartAt : 0)
 
@@ -307,12 +381,6 @@ export default function TrainingCoachPage() {
     }
   }
 
-  const timerReset = () => {
-    setRunStartAt(null)
-    setPausedAccumMs(0)
-    setTimerOwningStep(null)
-  }
-
   const applySuggestedDuration = () => {
     const idx = timerOwningStep != null ? timerOwningStep : step
     const ent = timeline[idx]
@@ -352,20 +420,7 @@ export default function TrainingCoachPage() {
     setStep((s) => clampStep(s + 1, timeline.length))
   }
 
-  const durationOverridesForApi = useMemo(() => {
-    const out = {}
-    for (let i = 0; i < timeline.length; i++) {
-      const ent = timeline[i]
-      const { item } = ent
-      if (item.item_type !== 'exercise' || item.id == null) continue
-      const k = itemStableKey(item, ent.secOrder, ent.ii)
-      const dv = deltas[k]?.actual_duration_min
-      if (dv !== undefined && dv !== '' && dv !== null && !Number.isNaN(Number(dv))) {
-        out[String(item.id)] = { actual_duration_min: Number(dv) }
-      }
-    }
-    return out
-  }, [timeline, deltas])
+  const durationOverridesForApi = useMemo(() => durationOverridesMapFromDeltas(unit, deltas), [unit, deltas])
 
   useEffect(() => {
     const item = currentEntry?.item
@@ -487,6 +542,36 @@ export default function TrainingCoachPage() {
         <button type="button" className="btn btn-secondary" onClick={() => navigate('/planning')}>
           Planung
         </button>
+        {streamFocusOptions.length > 0 ? (
+          <label
+            className="no-print"
+            style={{ display: 'inline-flex', alignItems: 'center', gap: '6px', fontSize: '0.82rem', color: 'var(--text2)' }}
+          >
+            <span style={{ color: 'var(--text3)', whiteSpace: 'nowrap' }}>Ansicht</span>
+            <select
+              className="form-input"
+              style={{ minWidth: 'min(220px, 72vw)', margin: 0, padding: '6px 8px', fontSize: '0.82rem' }}
+              value={coachFocus ? `${coachFocus.phaseOrder}-${coachFocus.streamOrder}` : ''}
+              onChange={(e) => {
+                setCoachDebriefPhase(false)
+                timerReset()
+                const v = e.target.value
+                if (!v) setSearchParams({}, { replace: true })
+                else {
+                  const [ppo, sso] = v.split('-').map((x) => parseInt(x, 10))
+                  setSearchParams({ po: String(ppo), so: String(sso) }, { replace: true })
+                }
+              }}
+            >
+              <option value="">Gesamtplan (alle Gruppen)</option>
+              {streamFocusOptions.map((o) => (
+                <option key={o.valueKey} value={o.valueKey}>
+                  {o.label}
+                </option>
+              ))}
+            </select>
+          </label>
+        ) : null}
         <button
           type="button"
           className="btn btn-primary"
@@ -497,6 +582,21 @@ export default function TrainingCoachPage() {
         </button>
       </nav>
 
+      {streamParamsInvalid ? (
+        <p
+          className="no-print card"
+          style={{
+            padding: '10px 12px',
+            fontSize: '0.82rem',
+            color: 'var(--danger)',
+            marginBottom: '8px',
+            flexShrink: 0,
+          }}
+        >
+          Ungültige Stream-Parameter in der Adresszeile — es wird der Gesamtplan angezeigt.
+        </p>
+      ) : null}
+
       <header
         className="card training-coach-hero training-coach-hero--compact"
         style={{
@@ -517,6 +617,15 @@ export default function TrainingCoachPage() {
           {unit.planned_time_start && ` · ${String(unit.planned_time_start).slice(0, 5)}`}
           {unit.planned_focus ? ` · ${unit.planned_focus}` : ''}
         </h1>
+        {coachFocus ? (
+          <p style={{ fontSize: '0.8rem', color: 'var(--text2)', margin: '8px 0 0', lineHeight: 1.35 }}>
+            Fokus:{' '}
+            {streamFocusOptions.find((o) => o.phaseOrder === coachFocus.phaseOrder && o.streamOrder === coachFocus.streamOrder)
+              ?.label ?? `Phase ${coachFocus.phaseOrder} · Gruppe ${coachFocus.streamOrder + 1}`}
+            {' · '}
+            Ganzgruppen-Abschnitte bleiben voll sichtbar; in der gewählten Split-Phase nur diese Spalte.
+          </p>
+        ) : null}
       </header>
 
       {outlineOpen && (

frontend/src/pages/TrainingUnitRunPage.jsx

@@ -638,12 +638,33 @@ export default function TrainingUnitRunPage() {
                               fontSize: '0.88rem',
                               fontWeight: 700,
                               color: 'hsl(200 30% 28%)',
+                              display: 'flex',
+                              flexWrap: 'wrap',
+                              alignItems: 'center',
+                              justifyContent: 'space-between',
+                              gap: '8px',
                             }}
                           >
-                            {st.streamTitle ? String(st.streamTitle).trim() : `Gruppe ${st.streamOrder + 1}`}
-                            <span style={{ fontWeight: 500, marginLeft: '8px', opacity: 0.85 }}>
-                              · ca. {st.minutes} Min. (Üb.)
+                            <span>
+                              {st.streamTitle ? String(st.streamTitle).trim() : `Gruppe ${st.streamOrder + 1}`}
+                              <span style={{ fontWeight: 500, marginLeft: '8px', opacity: 0.85 }}>
+                                · ca. {st.minutes} Min. (Üb.)
+                              </span>
                             </span>
+                            <Link
+                              className="no-print"
+                              to={`/planning/run/${unitId}/coach?po=${run.phaseOrderIndex}&so=${st.streamOrder}`}
+                              style={{
+                                fontSize: '0.78rem',
+                                fontWeight: 600,
+                                color: 'var(--accent-dark)',
+                                textDecoration: 'underline',
+                                textUnderlineOffset: '2px',
+                                whiteSpace: 'nowrap',
+                              }}
+                            >
+                              Coach · nur diese Gruppe
+                            </Link>
                           </div>
                           <div style={{ display: 'flex', flexDirection: 'column', gap: '1rem' }}>
                             {st.sections.map((sec) => renderSectionCard(sec, siUnit(sec)))}

frontend/src/utils/trainingPlanUtils.js

@@ -208,8 +208,9 @@ function coachContextLabelForSection(sec, sectionsList) {
   return `Parallel · ${pt} · ${st}`
 }
 
-/** Flache Reihenfolge für Coach-Timeline (global wie im Editor, inkl. gemischter Split-Abschnitte). */
-export function flattenPlanTimeline(unit) {
+/** Flache Reihenfolge für Coach-Timeline.
+ * @param {object|null} coachFocus `{ phaseOrder, streamOrder }` = nur dieser Stream in dieser parallelen Phase; andere Split-Phasen weiterhin voll (alle Streams verschränkt). Null = Gesamtplan.*/
+export function flattenPlanTimeline(unit, coachFocus = null) {
   const sections = sectionsWithPlanLocForDisplay(unit)
   const model = buildPlanRunViewModelFromSections(sections)
   if (model.mode === 'empty') return []
@@ -232,15 +233,78 @@ export function flattenPlanTimeline(unit) {
     })
   }
 
+  const f = coachFocus
   for (const run of model.runs) {
-    for (const sec of run.globalOrderSections) {
-      pushSectionItems(sec, coachContextLabelForSection(sec, sections))
+    if (run.kind === 'legacy' || run.kind === 'whole_group') {
+      for (const sec of run.globalOrderSections) {
+        pushSectionItems(sec, coachContextLabelForSection(sec, sections))
+      }
+      continue
+    }
+    if (run.kind === 'parallel') {
+      if (f == null || run.phaseOrderIndex !== f.phaseOrder) {
+        for (const sec of run.globalOrderSections) {
+          pushSectionItems(sec, coachContextLabelForSection(sec, sections))
+        }
+      } else {
+        const st = run.streams?.find((x) => x.streamOrder === f.streamOrder)
+        if (st?.sections?.length) {
+          for (const sec of st.sections) {
+            pushSectionItems(sec, coachContextLabelForSection(sec, sections))
+          }
+        }
+      }
     }
   }
 
   return list
 }
 
+/** Optionen für Coach-Stream-Auswahl (phases · Gruppe). */
+export function listCoachStreamFocusOptions(unit) {
+  const model = buildPlanRunViewModelFromSections(sectionsWithPlanLocForDisplay(unit))
+  const opts = []
+  for (const run of model.runs) {
+    if (run.kind !== 'parallel' || !run.streams?.length) continue
+    const phaseLabel =
+      run.phaseTitle != null && String(run.phaseTitle).trim()
+        ? String(run.phaseTitle).trim()
+        : `Phase ${run.phaseOrderIndex}`
+    for (const st of run.streams) {
+      const gl =
+        st.streamTitle != null && String(st.streamTitle).trim()
+          ? String(st.streamTitle).trim()
+          : `Gruppe ${st.streamOrder + 1}`
+      opts.push({
+        phaseOrder: run.phaseOrderIndex,
+        streamOrder: st.streamOrder,
+        label: `${phaseLabel} · ${gl}`,
+        valueKey: `${run.phaseOrderIndex}-${st.streamOrder}`,
+      })
+    }
+  }
+  return opts
+}
+
+/** Alle Ist-Minuten-Overrides aus lokalem Delta-State für PUT (unabhängig von gefilterter Coach-Timeline). */
+export function durationOverridesMapFromDeltas(unit, deltas) {
+  const out = {}
+  if (!unit || !deltas || typeof deltas !== 'object') return out
+  const sections = sortedSections(unit)
+  sections.forEach((sec, si) => {
+    const secOrder = sec.order_index ?? si
+    sortedItems(sec).forEach((it, ii) => {
+      if (it.item_type !== 'exercise' || it.id == null) return
+      const k = itemStableKey(it, secOrder, ii)
+      const dv = deltas[k]?.actual_duration_min
+      if (dv !== undefined && dv !== '' && dv !== null && !Number.isNaN(Number(dv))) {
+        out[String(it.id)] = { actual_duration_min: Number(dv) }
+      }
+    })
+  })
+  return out
+}
+
 export function summarizeTimelineEntry({ item }) {
   if (!item) return ''
   if (item.item_type === 'note') {