Front : heure de passage des artistes (config + mock du solveur)

- ArtistRead/Create/Update gagnent start_time/end_time.
- Onglet Programmation : chaque artiste a désormais deux champs heure
  (début/fin de passage), éditables comme le nom.
- Mock du solveur : porte le même malus de conflit d'artiste que le
  back-end (un créneau qui chevauche un passage souhaité est pénalisé),
  pour un comportement de démo cohérent.
- Jeu de démo : 2 artistes par jour avec des horaires distincts
  (18h-19h / 20h30-22h) au lieu d'un horaire par défaut implicite.

typecheck / lint / build / smoke au vert.

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

frontend/src/api/mock/dataset.ts

@@ -179,13 +179,19 @@ export function buildMockState(): MockState {
     }
   }
 
-  // Programmation : 2 artistes par jour de l'édition.
+  // Programmation : 2 artistes par jour de l'édition, à des horaires distincts.
+  const ARTIST_SLOTS: Array<[string, string]> = [
+    ['18:00:00', '19:00:00'],
+    ['20:30:00', '22:00:00'],
+  ];
   const artists: ArtistRead[] = DAY_DATES.flatMap((dateStr, d) =>
     [0, 1].map((k) => ({
       id: `art${d * 2 + k}`,
       edition_id,
       name: ARTIST_POOL[(d * 2 + k) % ARTIST_POOL.length],
       performance_date: dateStr,
+      start_time: ARTIST_SLOTS[k][0],
+      end_time: ARTIST_SLOTS[k][1],
       created_at: NOW,
       updated_at: NOW,
     })),

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

@@ -391,22 +391,45 @@ const SOLVER_WISH_BONUS = 30;
 const SOLVER_AVAIL_PENALTY_PER_HALF_HOUR = 5;
 const SOLVER_DAILY_OVERAGE_PENALTY_PER_MIN = 2;
 const SOLVER_REST_PENALTY = 60;
+const SOLVER_ARTIST_CONFLICT_PENALTY = 80;
 const SOLVER_FAIRNESS_PENALTY_PER_HOUR = 2;
 
+type TimeWindow = { starts_at: string; ends_at: string };
+
+function timeRangesOverlap(a: TimeWindow, b: TimeWindow): boolean {
+  return a.starts_at < b.ends_at && b.starts_at < a.ends_at;
+}
+
 function volunteerExistingShifts(volunteerId: string): ShiftRead[] {
   return state.assignments
     .filter((a) => a.volunteer_id === volunteerId)
     .map((a) => shiftById(a.shift_id));
 }
 
+/** Fenêtres datées des passages que le bénévole veut voir (un créneau qui
+ * chevauche l'une d'elles lui ferait manquer le passage). */
+function wishedArtistWindows(volunteer: VolunteerRead): TimeWindow[] {
+  return volunteer.artist_ids
+    .map((id) => state.artists.find((a) => a.id === id))
+    .filter((a): a is ArtistRead => Boolean(a))
+    .map((a) => {
+      const endDate = a.end_time > a.start_time ? a.performance_date : addDays(a.performance_date, 1);
+      return { starts_at: `${a.performance_date}T${a.start_time}`, ends_at: `${endDate}T${a.end_time}` };
+    });
+}
+
 function solverScore(
   volunteer: VolunteerRead,
   shift: ShiftRead,
   assignedCount: number,
   existing: ShiftRead[],
+  wishedArtists: TimeWindow[],
 ): number {
   let score = assignedCount < shift.min_staff ? SOLVER_URGENT_BASE : SOLVER_NORMAL_BASE;
   if (volunteer.wished_position_ids.includes(shift.position_id)) score += SOLVER_WISH_BONUS;
+  if (wishedArtists.some((w) => timeRangesOverlap(shift, w))) {
+    score -= SOLVER_ARTIST_CONFLICT_PENALTY;
+  }
 
   const windows = state.availability.get(volunteer.id) ?? [];
   const missed = uncoveredMinutes(windows, shift.starts_at, shift.ends_at);
@@ -454,8 +477,10 @@ function runSolver(): SolverRunResult {
   );
 
   const existingByVolunteer = new Map<string, ShiftRead[]>();
+  const artistWindowsByVolunteer = new Map<string, TimeWindow[]>();
   for (const v of state.volunteers) {
     existingByVolunteer.set(v.id, volunteerExistingShifts(v.id));
+    artistWindowsByVolunteer.set(v.id, wishedArtistWindows(v));
   }
   // Suggestions déjà retenues dans ce calcul, pour ne jamais proposer deux
   // fois un même bénévole sur des créneaux qui se chevauchent.
@@ -485,6 +510,7 @@ function runSolver(): SolverRunResult {
           shift,
           assignedCount.get(shift.id) ?? 0,
           existingByVolunteer.get(v.id) ?? [],
+          artistWindowsByVolunteer.get(v.id) ?? [],
         ),
       }))
       .filter((c) => c.score > 0)
@@ -599,6 +625,8 @@ export function createMockApi(): PlanningApi {
           edition_id: state.edition.id,
           name,
           performance_date: body.performance_date,
+          start_time: hms(body.start_time),
+          end_time: hms(body.end_time),
           created_at: now,
           updated_at: now,
         };
@@ -620,7 +648,13 @@ export function createMockApi(): PlanningApi {
         ) {
           throw new ApiError(409, 'artist.duplicate');
         }
-        Object.assign(artist, { name, performance_date: date, updated_at: touch() });
+        Object.assign(artist, {
+          name,
+          performance_date: date,
+          ...(body.start_time ? { start_time: hms(body.start_time) } : {}),
+          ...(body.end_time ? { end_time: hms(body.end_time) } : {}),
+          updated_at: touch(),
+        });
         return delay(artist);
       },
       remove: (_edition, id) => {