차량 모니터 복귀 링크 같은 페이지 제외

monitor.php

@@ -2338,6 +2338,7 @@ $carMonitorSession = car_monitor_launcher_session();
     let calibrationModalOpen = false;
     let calibrationSaveInFlight = false;
     const FALLBACK_BACK_TARGET = 'https://chaegeon.com/';
+    const BACK_HISTORY_KEY = 'chaegeon.backHistory.v1';
     const BACK_LINK_PATH_TITLE = {
         '/': '채건닷컴',
         '/home': '홈',
@@ -2405,6 +2406,38 @@ $carMonitorSession = car_monitor_launcher_session();
         return BACK_LINK_PATH_TITLE[parsed.pathname.replace(/\/$/, '') || '/'] || cleanPageTitle(parsed.pathname.split('/').filter(Boolean).pop() || '');
     }
 
+    function backPageKey(url) {
+        const parsed = sameSiteUrl(url);
+        if (!parsed) return '';
+        const pathname = parsed.pathname.replace(/\/+$/, '') || '/';
+        return `${parsed.hostname.replace(/^www\./, '')}${pathname}`;
+    }
+
+    function rememberBackHistory() {
+        try {
+            const current = new URL(location.href);
+            const list = JSON.parse(sessionStorage.getItem(BACK_HISTORY_KEY) || '[]')
+                .filter(item => item && item.href && item.key);
+            const entry = { href: current.href, key: backPageKey(current.href), time: Date.now() };
+            const last = list[list.length - 1];
+            const next = last && last.href === entry.href ? list : [...list, entry];
+            sessionStorage.setItem(BACK_HISTORY_KEY, JSON.stringify(next.slice(-20)));
+        } catch (e) {}
+    }
+
+    function storedBackTarget(currentKey) {
+        try {
+            const list = JSON.parse(sessionStorage.getItem(BACK_HISTORY_KEY) || '[]');
+            for (let i = list.length - 1; i >= 0; i--) {
+                const item = list[i];
+                if (item?.href && item.key && item.key !== currentKey && sameSiteUrl(item.href)) {
+                    return item.href;
+                }
+            }
+        } catch (e) {}
+        return '';
+    }
+
     function updateBackLinkLabel(label) {
         const link = document.getElementById('blogBackLink');
         if (!link) return;
@@ -2414,13 +2447,17 @@ $carMonitorSession = car_monitor_launcher_session();
     async function resolveBackTarget() {
         const ref = sameSiteUrl(document.referrer || '');
         const current = new URL(location.href);
-        const target = ref && ref.href !== current.href ? ref.href : FALLBACK_BACK_TARGET;
+        const currentKey = backPageKey(current.href);
+        rememberBackHistory();
+        const refIsDifferentPage = ref && backPageKey(ref.href) !== currentKey;
+        const target = refIsDifferentPage ? ref.href : (storedBackTarget(currentKey) || FALLBACK_BACK_TARGET);
         const knownLabel = titleFromBackUrl(target);
         let label = knownLabel;
+        const targetUrl = sameSiteUrl(target);
 
-        if (!knownLabel && ref && ref.origin === location.origin) {
+        if (!knownLabel && targetUrl && targetUrl.origin === location.origin) {
             try {
-                const res = await fetch(ref.href, { credentials: 'same-origin', cache: 'force-cache' });
+                const res = await fetch(targetUrl.href, { credentials: 'same-origin', cache: 'force-cache' });
                 if (res.ok) {
                     const html = await res.text();
                     const doc = new DOMParser().parseFromString(html, 'text/html');