fix: add WAL mode for session SQLite to prevent 'database is locked', persist active account tab in localStorage

webui/app.js

@@ -177,6 +177,7 @@ function renderAccountPanel(accountId) {
 function switchAccount(accountId) {
   if (state.activeAccount === accountId) return;
   state.activeAccount = accountId;
+  localStorage.setItem("activeAccount", accountId);
 
   // Update tabs
   document.querySelectorAll(".account-tab").forEach((tab) => {
@@ -488,8 +489,9 @@ async function loadAccounts() {
   // Render panels for each account
   accounts.forEach((acc) => renderAccountPanel(acc.id));
 
-  // Determine active account
-  const activeId = state.activeAccount || accounts[0].id;
+  // Determine active account (persisted across reloads)
+  const savedId = localStorage.getItem("activeAccount");
+  const activeId = (savedId && accounts.some(a => a.id === savedId)) ? savedId : (state.activeAccount || accounts[0].id);
   switchAccount(activeId);
 
   // Update settings