feat: update elesite integration to prioritize non-empty formation units and improve sorting logic

lib/webViewInjectjavascript.ts

@@ -372,15 +372,27 @@ export const injectJavascriptData = ({
         return null;
       }
       const results = [];
-      for (const entry of elesiteData) {
+      // 高松(left_station)側のユニットを先に表示
+      // (heading_to === "left") === is_leading が true → 高松(left)端のユニット
+      const sortedElesiteData = elesiteData.slice().sort((a, b) => {
+        const aT = a.trains && a.trains.find(t => t.train_number === trainNumber);
+        const bT = b.trains && b.trains.find(t => t.train_number === trainNumber);
+        const aNav = aT && aT.nav;
+        const bNav = bT && bT.nav;
+        const aIsLeft = (aNav && aNav.heading_to === 'left') === (aNav && aNav.is_leading === true);
+        const bIsLeft = (bNav && bNav.heading_to === 'left') === (bNav && bNav.is_leading === true);
+        if (aIsLeft === bIsLeft) return 0;
+        return aIsLeft ? -1 : 1;
+      });
+      for (const entry of sortedElesiteData) {
         if (!entry.trains) continue;
         const found = entry.trains.find(train => train.train_number === trainNumber);
         if (!found) continue;
-        // formation_config.units 優先、なければ formations
+        // units が1件以上ある場合のみ編成名を返す（空 units は報告なし扱い）
         const units = entry.formation_config && entry.formation_config.units;
         const formText = (units && units.length)
           ? units.map(u => u.formation).join('+')
-          : (entry.formations && entry.formations.trim() !== '' ? entry.formations : null);
+          : null;
         if (formText) results.push(formText);
       }
       return results.length > 0 ? results.join(', ') : null;