feat: calendrier impérial et conversions calendaires

- calendrier impérial : fenêtre compacte (260px), affichage date
- commande /cal, auto-ouverture paramétrable dans les settings
- socket calendarSync : mise à jour temps réel pour les joueurs
- config MJ : année, jour (label live), heure:minute, planète
- boutons +1 jour et +1 heure (report 24h→jour, 365→1)
- conversions : Solomani, Vilani, Zhodani (Olympiade), Aslan, K'Kree, Hiver
- formules wiki.travellerrpg.com/Date_Conversion, section repliable
- fix: renderChatInput /cal trop large → exact match
- fix: fenêtre refermable (onClose nullifie la référence)
- fix: socket joueur lit data direct au lieu de readCalendar()

scripts/calendarDate.js

@@ -0,0 +1,95 @@
+const MODULE_ID = 'mgt2-compendium-amiral-denisov';
+
+export function imperialToSolomani(impYear) {
+  return Math.round(impYear * 1.0006644 + 4521);
+}
+
+export function imperialToVilani(impYear) {
+  return Math.round((impYear + 4045) / 1.312);
+}
+
+export function imperialToZhodani(impYear) {
+  const raw = (impYear + 6731) / 2.26;
+  const olympiad = Math.floor(raw);
+  const frac = raw - olympiad;
+  const year = Math.min(3, Math.max(1, Math.round(frac * 3)));
+  return { olympiad, year, label: `${olympiad}.${year}` };
+}
+
+export function imperialToAslan(impYear) {
+  return Math.round((impYear + 2083) / 0.877);
+}
+
+export function imperialToKkree(impYear) {
+  return Math.round((impYear + 8145) / 1.2);
+}
+
+export function imperialToHiver(impYear) {
+  return Math.round((impYear - 410) * 2);
+}
+
+export function computeConversions(impYear) {
+  const y = impYear ?? 1116;
+  const z = imperialToZhodani(y);
+  return {
+    solomani: `${imperialToSolomani(y)} AD`,
+    vilani: `${imperialToVilani(y)} VI`,
+    zhodani: z.label,
+    aslan: `${imperialToAslan(y)}`,
+    kkree: `${imperialToKkree(y)}`,
+    hiver: `${imperialToHiver(y)} HF`,
+  };
+}
+
+export const DAY_NAMES = [
+  'Holiday',
+  'Wonday',
+  'Tuday',
+  'Thirday',
+  'Forday',
+  'Fiday',
+  'Sixday',
+  'Senday',
+];
+
+export const DAY_LABELS_FR = {
+  Holiday: 'Holiday',
+  Wonday: 'Wonday',
+  Tuday: 'Tuday',
+  Thirday: 'Thirday',
+  Forday: 'Forday',
+  Fiday: 'Fiday',
+  Sixday: 'Sixday',
+  Senday: 'Senday',
+};
+
+export function getDayLabel(day) {
+  if (day < 1 || day > 365) return '?';
+  if (day === 1) return DAY_NAMES[0];
+  return DAY_NAMES[((day - 2) % 7) + 1];
+}
+
+export function getWeekday(day) {
+  if (day < 1 || day > 365) return -1;
+  if (day === 1) return -1;
+  return (day - 2) % 7;
+}
+
+export function formatImperialDate({ year, day, hour, minute, planet } = {}) {
+  const y = year ?? 1116;
+  const d = day ?? 1;
+  const dayLabel = getDayLabel(d);
+  const dayStr = String(d).padStart(3, '0');
+  let label = `${dayLabel}, ${dayStr}-${y} IC`;
+  if (hour != null && minute != null) {
+    const h = String(Math.round(hour)).padStart(2, '0');
+    const m = String(Math.round(minute)).padStart(2, '0');
+    label += ` ─ ${h}:${m}`;
+    if (planet) label += ` (${planet})`;
+  }
+  return label;
+}
+
+export function getDefaultCalendar() {
+  return { year: 1116, day: 1, hour: 12, minute: 0, planet: '' };
+}