Stundenplan Phase 3c: complete Stammdaten + RegelnHub with 4 editors

Frontend additions in studio-v2:
  - PeriodsManager renders the weekly grid as a Mo–So table with one
    row per period_index. New entries auto-increment period_index so
    the user can hit Anlegen repeatedly for a full day's slots.
  - CurriculumManager joins classes + subjects; new entries refuse to
    open when either prerequisite list is empty (banner instead).
  - AssignmentsManager joins teacher × class × subject with the same
    prerequisite-banner pattern.
  - regeln/RegelnHub: vertical sidebar grouping all 15 constraint
    types by parent entity (Lehrer/Fach/Klasse/Raum). Implemented
    editors are clickable, the other 11 are visibly disabled with
    a 'soon' tag.
  - Three new editors:
      TeacherUnavailableWindowEditor (time-window pattern),
      SubjectMaxConsecutiveEditor (number-input pattern),
      SubjectPreferredPeriodEditor (number range pattern).
  - page.tsx wires every tab to its manager; the not-implemented
    placeholder is gone (no more empty tabs).

Test coverage:
  - e2e/stundenplan.spec.ts rewritten: 23 tests across 7 suites,
    covering all 8 tabs, the new managers' prerequisite banners,
    sub-tab switching in the RegelnHub, and the disabled state of
    not-yet-implemented constraint rules. Each test mocks the
    backend via page.route() so the suite stays hermetic.

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

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

@@ -0,0 +1,183 @@
+'use client'
+
+import { useState, useEffect, useCallback } from 'react'
+import { useTheme } from '@/lib/ThemeContext'
+import { teacherUnavailableWindowApi, teachersApi } from '@/lib/stundenplan/api'
+import type { TeacherUnavailableWindow, TimetableTeacher } from '@/app/stundenplan/types'
+
+const DAYS = [
+  { v: 1, label: 'Montag' }, { v: 2, label: 'Dienstag' }, { v: 3, label: 'Mittwoch' },
+  { v: 4, label: 'Donnerstag' }, { v: 5, label: 'Freitag' }, { v: 6, label: 'Samstag' }, { v: 7, label: 'Sonntag' },
+]
+
+type FormState = Omit<TeacherUnavailableWindow, 'id' | 'created_by_user_id' | 'created_at'>
+
+const initialForm: FormState = {
+  teacher_id: '',
+  day_of_week: 2,
+  start_time: '13:00',
+  end_time: '17:00',
+  is_hard: true,
+  weight: 100,
+  active: true,
+  note: '',
+}
+
+export function TeacherUnavailableWindowEditor() {
+  const { isDark } = useTheme()
+  const [items, setItems] = useState<TeacherUnavailableWindow[]>([])
+  const [teachers, setTeachers] = useState<TimetableTeacher[]>([])
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<string | null>(null)
+  const [showForm, setShowForm] = useState(false)
+  const [submitting, setSubmitting] = useState(false)
+  const [form, setForm] = useState<FormState>(initialForm)
+
+  const load = useCallback(async () => {
+    setLoading(true); setError(null)
+    try {
+      const [rules, t] = await Promise.all([teacherUnavailableWindowApi.list(), teachersApi.list()])
+      setItems(rules || [])
+      setTeachers(t || [])
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Laden fehlgeschlagen')
+    } finally { setLoading(false) }
+  }, [])
+
+  useEffect(() => { load() }, [load])
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault()
+    setSubmitting(true); setError(null)
+    try {
+      await teacherUnavailableWindowApi.create(form)
+      setForm(initialForm); setShowForm(false); await load()
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Anlegen fehlgeschlagen')
+    } finally { setSubmitting(false) }
+  }
+
+  const handleDelete = async (id: string) => {
+    if (!confirm('Regel wirklich loeschen?')) return
+    try { await teacherUnavailableWindowApi.remove(id); await load() }
+    catch (err) { setError(err instanceof Error ? err.message : 'Loeschen fehlgeschlagen') }
+  }
+
+  const tLabel = (id: string): string => {
+    const t = teachers.find(x => x.id === id)
+    return t ? `${t.last_name}, ${t.first_name}` : id.slice(0, 8) + '…'
+  }
+
+  const cardClass = isDark ? 'bg-white/10 border-white/20 text-white' : 'bg-white/80 border-black/10 text-slate-900'
+  const inputClass = isDark ? 'bg-white/10 border-white/20 text-white' : 'bg-white border-slate-300 text-slate-900'
+
+  return (
+    <div className="space-y-4" data-testid="teacher-unavailable-window-editor">
+      <div className="flex items-center justify-between">
+        <div>
+          <h3 className={`text-lg font-semibold ${isDark ? 'text-white' : 'text-slate-900'}`}>
+            Lehrer: Zeitfenster nicht verfuegbar
+          </h3>
+          <p className={`text-sm ${isDark ? 'text-white/60' : 'text-slate-500'}`}>
+            Beispiel: „Lehrer Z Dienstags 13:00–17:00 nicht".
+          </p>
+        </div>
+        <button
+          onClick={() => setShowForm(s => !s)}
+          disabled={teachers.length === 0}
+          className={`px-4 py-2 rounded-xl font-medium transition-colors disabled:opacity-50 ${isDark ? 'bg-indigo-500 hover:bg-indigo-600 text-white' : 'bg-indigo-600 hover:bg-indigo-700 text-white'}`}
+        >
+          {showForm ? 'Abbrechen' : '+ Neue Regel'}
+        </button>
+      </div>
+
+      {teachers.length === 0 && !loading && (
+        <div className={`p-3 rounded-xl text-sm ${isDark ? 'bg-amber-500/10 border border-amber-500/30 text-amber-200' : 'bg-amber-50 border border-amber-200 text-amber-900'}`}>
+          Zuerst Lehrer anlegen.
+        </div>
+      )}
+
+      {error && <div className="p-3 rounded-xl bg-red-500/20 border border-red-500/40 text-red-300">{error}</div>}
+
+      {showForm && (
+        <form onSubmit={handleSubmit} className={`p-4 rounded-2xl border backdrop-blur-xl ${cardClass}`}>
+          <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={form.teacher_id} onChange={e => setForm({ ...form, teacher_id: e.target.value })} className={`w-full px-3 py-2 rounded-lg border ${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">Wochentag</label>
+              <select value={form.day_of_week} onChange={e => setForm({ ...form, day_of_week: parseInt(e.target.value) })} className={`w-full px-3 py-2 rounded-lg border ${inputClass}`}>
+                {DAYS.map(d => <option key={d.v} value={d.v}>{d.label}</option>)}
+              </select>
+            </div>
+            <div>
+              <label className="block text-sm mb-1 opacity-70">Von</label>
+              <input type="time" required value={form.start_time} onChange={e => setForm({ ...form, start_time: e.target.value })} className={`w-full px-3 py-2 rounded-lg border ${inputClass}`} />
+            </div>
+            <div>
+              <label className="block text-sm mb-1 opacity-70">Bis</label>
+              <input type="time" required value={form.end_time} onChange={e => setForm({ ...form, end_time: e.target.value })} className={`w-full px-3 py-2 rounded-lg border ${inputClass}`} />
+            </div>
+            <div className="flex items-center gap-2">
+              <input type="checkbox" id="is_hard_w" checked={form.is_hard} onChange={e => setForm({ ...form, is_hard: e.target.checked })} className="w-5 h-5" />
+              <label htmlFor="is_hard_w" className="text-sm">Harte Regel</label>
+            </div>
+            <div>
+              <label className="block text-sm mb-1 opacity-70">Weight (0-100)</label>
+              <input type="number" min={0} max={100} value={form.weight} onChange={e => setForm({ ...form, weight: parseInt(e.target.value) || 0 })} className={`w-full px-3 py-2 rounded-lg border ${inputClass}`} />
+            </div>
+            <div className="md:col-span-2 flex items-end">
+              <button type="submit" disabled={submitting} className="w-full px-4 py-2 rounded-lg bg-emerald-500 hover:bg-emerald-600 text-white font-medium disabled:opacity-50">
+                {submitting ? 'Speichert...' : 'Anlegen'}
+              </button>
+            </div>
+          </div>
+          <div className="mt-3">
+            <label className="block text-sm mb-1 opacity-70">Begruendung (optional)</label>
+            <input value={form.note || ''} onChange={e => setForm({ ...form, note: e.target.value })} className={`w-full px-3 py-2 rounded-lg border ${inputClass}`} />
+          </div>
+        </form>
+      )}
+
+      {loading ? (
+        <div className={`text-center py-8 opacity-60 ${isDark ? 'text-white' : 'text-slate-700'}`}>Laedt…</div>
+      ) : items.length === 0 ? (
+        <div className={`text-center py-8 opacity-60 ${isDark ? 'text-white' : 'text-slate-700'}`}>Keine Regeln vorhanden.</div>
+      ) : (
+        <div className={`rounded-2xl border backdrop-blur-xl overflow-hidden ${cardClass}`}>
+          <table className="w-full">
+            <thead className={isDark ? 'bg-white/5' : 'bg-slate-100'}>
+              <tr>
+                <th className="text-left px-4 py-3 text-sm font-medium opacity-70">Lehrer</th>
+                <th className="text-left px-4 py-3 text-sm font-medium opacity-70">Tag</th>
+                <th className="text-left px-4 py-3 text-sm font-medium opacity-70">Zeitfenster</th>
+                <th className="text-left px-4 py-3 text-sm font-medium opacity-70">Hart</th>
+                <th className="text-left px-4 py-3 text-sm font-medium opacity-70">Notiz</th>
+                <th className="px-4 py-3"></th>
+              </tr>
+            </thead>
+            <tbody>
+              {items.map(c => (
+                <tr key={c.id} className={isDark ? 'border-t border-white/10' : 'border-t border-slate-200'}>
+                  <td className="px-4 py-3 font-medium">{tLabel(c.teacher_id)}</td>
+                  <td className="px-4 py-3">{DAYS.find(d => d.v === c.day_of_week)?.label || c.day_of_week}</td>
+                  <td className="px-4 py-3">{c.start_time}–{c.end_time}</td>
+                  <td className="px-4 py-3">{c.is_hard ? '✓' : '—'}</td>
+                  <td className="px-4 py-3 text-sm opacity-70">{c.note || '—'}</td>
+                  <td className="px-4 py-3 text-right">
+                    <button onClick={() => handleDelete(c.id)} className="text-red-400 hover:text-red-300 text-sm">Loeschen</button>
+                  </td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        </div>
+      )}
+    </div>
+  )
+}