Créneaux types : paramétrage + génération auto des créneaux

Le paramétrage des créneaux se fait dans « Règles & édition » : la coordination
définit des créneaux types (DayPart). À la création d'un poste, un créneau à
besoin 0/0 est généré pour chaque jour de l'édition et chaque créneau type ;
les coordinateurs ajustent ensuite min/idéal.

Back-end :
- DayPart CRUD (GET/POST/PATCH/DELETE /editions/{id}/day-parts). Code figé
  après création (slugifié depuis le libellé si absent), unique par édition.
- Shift.day_part_id (nullable, SET NULL) + migration 0004.
- create_position génère les créneaux ; POST .../positions/{pid}/generate-shifts
  recrée les manquants (idempotent, ne touche pas aux besoins déjà réglés).
- 13 tests (day-parts, génération, extension d'édition, ajout de type).

Front-end :
- api/hooks/mock : dayParts CRUD + positions.generateShifts.
- ConfigRules : panneau « Créneaux types » (libellé + horaires éditables,
  ajout, suppression).
- ConfigGrid : bouton « Générer les créneaux » sur l'en-tête du poste.
- GrillePage : case « à définir » (gris, glyphe ·) quand min=idéal=0, avec
  entrée de légende.

155 tests back OK ; typecheck + lint + build + smoke front OK.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017uUsRg7XzopkCPWimwg9ZM

frontend/src/api/mock/mock-client.ts

@@ -4,6 +4,9 @@ import type {
   AccountRead,
   AssignmentRead,
   AssignmentValidateResult,
+  DayPartCreate,
+  DayPartRead,
+  DayPartUpdate,
   EditionUpdate,
   MatrixResponse,
   PlanningNotificationRequest,
@@ -67,6 +70,57 @@ const notFound = (): never => {
 
 const touch = () => new Date().toISOString().replace(/\.\d+Z$/, '');
 
+const addDays = (day: string, n: number): string => {
+  const [y, m, d] = day.split('-').map(Number);
+  return new Date(Date.UTC(y, m - 1, d + n)).toISOString().slice(0, 10);
+};
+
+const slugCode = (label: string): string =>
+  label
+    .trim()
+    .toUpperCase()
+    .normalize('NFD')
+    .replace(/[^A-Z0-9]+/g, '_')
+    .replace(/^_+|_+$/g, '');
+
+function shiftWindow(day: string, dp: DayPartRead): [string, string] {
+  const endDay = dp.end_time <= dp.start_time ? addDays(day, 1) : day;
+  return [`${day}T${dp.start_time}`, `${endDay}T${dp.end_time}`];
+}
+
+function generateMissingShifts(positionId: string): number {
+  const existing = new Set(
+    state.shifts
+      .filter((s) => s.position_id === positionId)
+      .map((s) => `${s.day_part_id}|${s.starts_at.slice(0, 10)}`),
+  );
+  let created = 0;
+  let day = state.edition.start_date;
+  while (day <= state.edition.end_date) {
+    for (const dp of state.dayParts) {
+      if (existing.has(`${dp.id}|${day}`)) continue;
+      const [starts_at, ends_at] = shiftWindow(day, dp);
+      const now = touch();
+      state.shifts.push({
+        id: `s${state.seq++}`,
+        edition_id: state.edition.id,
+        position_id: positionId,
+        day_part_id: dp.id,
+        starts_at,
+        ends_at,
+        min_staff: 0,
+        ideal_staff: 0,
+        required_skill_codes: [],
+        created_at: now,
+        updated_at: now,
+      });
+      created += 1;
+    }
+    day = addDays(day, 1);
+  }
+  return created;
+}
+
 function shiftById(id: string): ShiftRead {
   const shift = state.shifts.find((s) => s.id === id);
   if (!shift) return notFound();
@@ -228,6 +282,50 @@ export function createMockApi(): PlanningApi {
         return delay(state.edition);
       },
     },
+    dayParts: {
+      list: () =>
+        delay([...state.dayParts].sort((a, b) => a.order - b.order || a.start_time.localeCompare(b.start_time))),
+      create: (_edition, body: DayPartCreate) => {
+        const code = (body.code ?? slugCode(body.label)).trim();
+        if (!code) throw new ApiError(422, 'day_part.code_required');
+        if (state.dayParts.some((d) => d.code === code)) {
+          throw new ApiError(409, 'day_part.duplicate_code');
+        }
+        const now = touch();
+        const dp: DayPartRead = {
+          id: `dp_${state.seq++}`,
+          edition_id: state.edition.id,
+          code,
+          label: body.label.trim(),
+          start_time: body.start_time,
+          end_time: body.end_time,
+          order: body.order ?? 0,
+          created_at: now,
+          updated_at: now,
+        };
+        state.dayParts.push(dp);
+        return delay(dp);
+      },
+      update: (_edition, id, body: DayPartUpdate) => {
+        const dp = state.dayParts.find((d) => d.id === id) ?? notFound();
+        Object.assign(dp, {
+          ...('label' in body ? { label: body.label } : {}),
+          ...('start_time' in body ? { start_time: body.start_time } : {}),
+          ...('end_time' in body ? { end_time: body.end_time } : {}),
+          ...('order' in body ? { order: body.order } : {}),
+          updated_at: touch(),
+        });
+        return delay(dp);
+      },
+      remove: (_edition, id) => {
+        state.dayParts = state.dayParts.filter((d) => d.id !== id);
+        state.shifts.forEach((s) => {
+          if (s.day_part_id === id) s.day_part_id = null;
+        });
+        return delay(undefined);
+      },
+    },
+
     volunteers: {
       list: () =>
         delay(
@@ -301,6 +399,7 @@ export function createMockApi(): PlanningApi {
           updated_at: now,
         };
         state.positions.push(position);
+        generateMissingShifts(position.id);
         return delay(position);
       },
       update: (_edition, id, body) => {
@@ -321,6 +420,10 @@ export function createMockApi(): PlanningApi {
         state.assignments = state.assignments.filter((a) => !shiftIds.has(a.shift_id));
         return delay(undefined);
       },
+      generateShifts: (_edition, id) => {
+        if (!state.positions.some((x) => x.id === id)) return notFound();
+        return delay({ created: generateMissingShifts(id) });
+      },
     },
 
     shifts: {
@@ -343,6 +446,7 @@ export function createMockApi(): PlanningApi {
           id: `s${state.seq++}`,
           edition_id: state.positions[0].edition_id,
           position_id: body.position_id,
+          day_part_id: null,
           starts_at: body.starts_at,
           ends_at: body.ends_at,
           min_staff: body.min_staff ?? 0,