Stundenplan Phase 3d: all 15 constraint editors via shared shell

Backend was already complete in Phase 2; this finishes the UI.

  - regeln/_shell.tsx introduces useConstraintCrud (handles list/create/
    delete state + reload), ConstraintShell (header, prereq banner,
    form toggle, error display, empty/loading/table render), and
    useShellStyles for the recurring theme tokens. Each editor now
    only carries its schema-specific bits.
  - Existing 4 editors (TeacherUnavailableDay/Window, SubjectMax
    Consecutive/PreferredPeriod) refactored onto the shell — every
    Playwright selector preserved.
  - 11 new editors covering the remaining constraint tables:
      TeacherMaxHours{Day,Week}, TeacherExcluded{Subject,Room},
      Subject{MinDayGap,ContiguousWhenRepeated,DoubleLesson},
      Class{MaxHoursDay,NoGaps},
      Room{RequiresType,Unavailable}.
  - RegelnHub now references all 15 editors directly — no more 'soon'
    placeholders. The two duplicate 'Max. Stunden / Tag' entries
    (teacher + class) are intentional and disambiguated by group.

Tests:
  - e2e/stundenplan.spec.ts: mock routes added for all 11 new constraint
    endpoints. RegelnHub suite gains a single test that switches
    through 13 uniquely-labelled editors, plus a dedicated test for
    the two duplicate 'Max. Stunden / Tag' labels.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

studio-v2/app/stundenplan/_components/regeln/TeacherMaxHoursEditors.tsx

@@ -0,0 +1,147 @@
+'use client'
+
+import { useState, useEffect } from 'react'
+import {
+  teacherMaxHoursDayApi, teacherMaxHoursWeekApi, teachersApi,
+} from '@/lib/stundenplan/api'
+import type {
+  TeacherMaxHoursDay, TeacherMaxHoursWeek, TimetableTeacher,
+} from '@/app/stundenplan/types'
+import { useConstraintCrud, ConstraintShell, useShellStyles } from './_shell'
+
+function useTeachers() {
+  const [teachers, setTeachers] = useState<TimetableTeacher[]>([])
+  useEffect(() => { teachersApi.list().then(setTeachers).catch(() => setTeachers([])) }, [])
+  return teachers
+}
+
+function tLabel(teachers: TimetableTeacher[], id: string): string {
+  const t = teachers.find(x => x.id === id)
+  return t ? `${t.last_name}, ${t.first_name}` : id.slice(0, 8) + '…'
+}
+
+// ---------- Max Hours / Day ----------
+
+type DayForm = Omit<TeacherMaxHoursDay, 'id' | 'created_by_user_id' | 'created_at'>
+const initialDay: DayForm = { teacher_id: '', max_hours: 6, is_hard: false, weight: 50, active: true, note: '' }
+
+export function TeacherMaxHoursDayEditor() {
+  const styles = useShellStyles()
+  const teachers = useTeachers()
+  const crud = useConstraintCrud<TeacherMaxHoursDay, DayForm>(teacherMaxHoursDayApi, initialDay)
+
+  return (
+    <ConstraintShell
+      testId="teacher-max-hours-day-editor"
+      title="Lehrer: Max. Stunden / Tag"
+      description="Beispiel: „Anna unterrichtet hoechstens 6 Stunden pro Tag" (oft Soft-Regel)."
+      newLabel="+ Neue Regel"
+      newDisabled={teachers.length === 0}
+      prereqWarning={teachers.length === 0 ? 'Zuerst Lehrer anlegen.' : null}
+      emptyText="Keine Regeln vorhanden."
+      tableHeaders={['Lehrer', 'Max. Std/Tag', 'Hart', 'Weight']}
+      state={crud}
+      formBody={
+        <div className="grid grid-cols-1 md:grid-cols-4 gap-3">
+          <div>
+            <label className="block text-sm mb-1 opacity-70">Lehrer</label>
+            <select required value={crud.form.teacher_id} onChange={e => crud.setForm({ ...crud.form, teacher_id: e.target.value })} className={`w-full px-3 py-2 rounded-lg border ${styles.inputClass}`}>
+              <option value="">— bitte waehlen —</option>
+              {teachers.map(t => <option key={t.id} value={t.id}>{t.last_name}, {t.first_name}</option>)}
+            </select>
+          </div>
+          <div>
+            <label className="block text-sm mb-1 opacity-70">Max. Stunden (1-12)</label>
+            <input type="number" min={1} max={12} required value={crud.form.max_hours} onChange={e => crud.setForm({ ...crud.form, max_hours: parseInt(e.target.value) || 1 })} className={`w-full px-3 py-2 rounded-lg border ${styles.inputClass}`} />
+          </div>
+          <div>
+            <label className="block text-sm mb-1 opacity-70">Weight (0-100)</label>
+            <input type="number" min={0} max={100} value={crud.form.weight} onChange={e => crud.setForm({ ...crud.form, weight: parseInt(e.target.value) || 0 })} className={`w-full px-3 py-2 rounded-lg border ${styles.inputClass}`} />
+          </div>
+          <div className="flex items-center gap-2">
+            <input type="checkbox" id="is_hard_mhd" checked={crud.form.is_hard} onChange={e => crud.setForm({ ...crud.form, is_hard: e.target.checked })} className="w-5 h-5" />
+            <label htmlFor="is_hard_mhd" className="text-sm">Harte Regel</label>
+          </div>
+          <div className="md:col-span-4 flex items-end">
+            <button type="submit" disabled={crud.submitting} className={styles.submitBtn}>{crud.submitting ? 'Speichert...' : 'Anlegen'}</button>
+          </div>
+        </div>
+      }
+      renderRow={(item) => {
+        const c = item as TeacherMaxHoursDay
+        return (
+          <tr key={c.id} className={styles.rowClass}>
+            <td className="px-4 py-3 font-medium">{tLabel(teachers, c.teacher_id)}</td>
+            <td className="px-4 py-3">{c.max_hours}</td>
+            <td className="px-4 py-3">{c.is_hard ? '✓' : '—'}</td>
+            <td className="px-4 py-3">{c.weight}</td>
+            <td className="px-4 py-3 text-right"><button onClick={() => crud.remove(c.id)} className={styles.deleteBtn}>Loeschen</button></td>
+          </tr>
+        )
+      }}
+    />
+  )
+}
+
+// ---------- Max Hours / Week ----------
+
+type WeekForm = Omit<TeacherMaxHoursWeek, 'id' | 'created_by_user_id' | 'created_at'>
+const initialWeek: WeekForm = { teacher_id: '', max_hours: 28, is_hard: true, weight: 100, active: true, note: '' }
+
+export function TeacherMaxHoursWeekEditor() {
+  const styles = useShellStyles()
+  const teachers = useTeachers()
+  const crud = useConstraintCrud<TeacherMaxHoursWeek, WeekForm>(teacherMaxHoursWeekApi, initialWeek)
+
+  return (
+    <ConstraintShell
+      testId="teacher-max-hours-week-editor"
+      title="Lehrer: Max. Stunden / Woche"
+      description="Beispiel: Teilzeit 50% → max. 14 h/Woche (harte Regel aus Vertrag)."
+      newLabel="+ Neue Regel"
+      newDisabled={teachers.length === 0}
+      prereqWarning={teachers.length === 0 ? 'Zuerst Lehrer anlegen.' : null}
+      emptyText="Keine Regeln vorhanden."
+      tableHeaders={['Lehrer', 'Max. Std/Woche', 'Hart', 'Weight']}
+      state={crud}
+      formBody={
+        <div className="grid grid-cols-1 md:grid-cols-4 gap-3">
+          <div>
+            <label className="block text-sm mb-1 opacity-70">Lehrer</label>
+            <select required value={crud.form.teacher_id} onChange={e => crud.setForm({ ...crud.form, teacher_id: e.target.value })} className={`w-full px-3 py-2 rounded-lg border ${styles.inputClass}`}>
+              <option value="">— bitte waehlen —</option>
+              {teachers.map(t => <option key={t.id} value={t.id}>{t.last_name}, {t.first_name}</option>)}
+            </select>
+          </div>
+          <div>
+            <label className="block text-sm mb-1 opacity-70">Max. Stunden (1-40)</label>
+            <input type="number" min={1} max={40} required value={crud.form.max_hours} onChange={e => crud.setForm({ ...crud.form, max_hours: parseInt(e.target.value) || 1 })} className={`w-full px-3 py-2 rounded-lg border ${styles.inputClass}`} />
+          </div>
+          <div>
+            <label className="block text-sm mb-1 opacity-70">Weight (0-100)</label>
+            <input type="number" min={0} max={100} value={crud.form.weight} onChange={e => crud.setForm({ ...crud.form, weight: parseInt(e.target.value) || 0 })} className={`w-full px-3 py-2 rounded-lg border ${styles.inputClass}`} />
+          </div>
+          <div className="flex items-center gap-2">
+            <input type="checkbox" id="is_hard_mhw" checked={crud.form.is_hard} onChange={e => crud.setForm({ ...crud.form, is_hard: e.target.checked })} className="w-5 h-5" />
+            <label htmlFor="is_hard_mhw" className="text-sm">Harte Regel</label>
+          </div>
+          <div className="md:col-span-4 flex items-end">
+            <button type="submit" disabled={crud.submitting} className={styles.submitBtn}>{crud.submitting ? 'Speichert...' : 'Anlegen'}</button>
+          </div>
+        </div>
+      }
+      renderRow={(item) => {
+        const c = item as TeacherMaxHoursWeek
+        return (
+          <tr key={c.id} className={styles.rowClass}>
+            <td className="px-4 py-3 font-medium">{tLabel(teachers, c.teacher_id)}</td>
+            <td className="px-4 py-3">{c.max_hours}</td>
+            <td className="px-4 py-3">{c.is_hard ? '✓' : '—'}</td>
+            <td className="px-4 py-3">{c.weight}</td>
+            <td className="px-4 py-3 text-right"><button onClick={() => crud.remove(c.id)} className={styles.deleteBtn}>Loeschen</button></td>
+          </tr>
+        )
+      }}
+    />
+  )
+}