Persist the last search session

static/app.js

@@ -89,6 +89,53 @@ const STATE = {
   _pageCache: {},
   _deferredAppendWhileDragging: false,
 };
+
+const SEARCH_SESSION_DB = "voiceofml-search-state";
+function openSearchSessionDB() {
+  return new Promise((resolve, reject) => {
+    if (!window.indexedDB) return reject(new Error("IndexedDB unavailable"));
+    const request = indexedDB.open(SEARCH_SESSION_DB, 1);
+    request.onupgradeneeded = () => {
+      if (!request.result.objectStoreNames.contains("session")) request.result.createObjectStore("session");
+    };
+    request.onsuccess = () => resolve(request.result);
+    request.onerror = () => reject(request.error);
+  });
+}
+
+async function persistSearchSession() {
+  if (location.pathname.startsWith("/static/reader.html")) return;
+  try {
+    const db = await openSearchSessionDB();
+    const transaction = db.transaction("session", "readwrite");
+    transaction.objectStore("session").put({ version: 1, url: location.href, updatedAt: Date.now() }, "last-search");
+    await new Promise((resolve, reject) => {
+      transaction.oncomplete = resolve;
+      transaction.onerror = () => reject(transaction.error);
+      transaction.onabort = () => reject(transaction.error);
+    });
+    db.close();
+  } catch (_) {}
+}
+
+async function restoreSearchSession() {
+  if (location.pathname !== "/" || location.search || location.hash) return false;
+  try {
+    const db = await openSearchSessionDB();
+    const transaction = db.transaction("session", "readonly");
+    const request = transaction.objectStore("session").get("last-search");
+    const saved = await new Promise((resolve, reject) => {
+      request.onsuccess = () => resolve(request.result);
+      request.onerror = () => reject(request.error);
+    });
+    db.close();
+    if (!saved || saved.version !== 1 || typeof saved.url !== "string") return false;
+    const target = new URL(saved.url);
+    if (target.origin !== location.origin || target.pathname.split("/").filter(Boolean).length > 1 || target.pathname === "/static/reader.html") return false;
+    history.replaceState(null, "", target.href);
+    return true;
+  } catch (_) { return false; }
+}
 let searchAbortController = null;
 let searchPrefetchAbortController = null;
 let searchPrefetchKey = null;
@@ -1108,6 +1155,7 @@ const ROUTER = {
       renderFilters(routeId);
     }
     routeInitialized = true;
+    persistSearchSession();
   },
   updateUI() {
     if (STATE.mode === "global") {
@@ -1180,6 +1228,7 @@ function syncStateToURL(replace = true) {
   } else {
     history.pushState(null, "", url);
   }
+  persistSearchSession();
 }
 
 function syncURLToState() {
@@ -3071,6 +3120,7 @@ function setupResultDelegation() {
 
 async function init() {
   cacheDOM();
+  await restoreSearchSession();
   setupReaderIntentWarming();
   STATE.isDark = localStorage.getItem("theme") !== "light";
   applyTheme();