Add desktop sidebar toggle with persistent state, search result highlighting, and improved filter icon positioning

frontend/app.js

@@ -368,6 +368,32 @@
     return res.json();
   }
 
+  // ---------------------------------------------------------------------------
+  // Sidebar toggle (desktop)
+  // ---------------------------------------------------------------------------
+  function initSidebarToggle() {
+    const toggleBtn = document.getElementById("sidebar-toggle-btn");
+    const sidebar = document.getElementById("sidebar");
+    const resizeHandle = document.getElementById("sidebar-resize-handle");
+    
+    if (!toggleBtn || !sidebar || !resizeHandle) return;
+    
+    // Restore saved state
+    const savedState = localStorage.getItem("obsigate-sidebar-hidden");
+    if (savedState === "true") {
+      sidebar.classList.add("hidden");
+      resizeHandle.classList.add("hidden");
+      toggleBtn.classList.add("active");
+    }
+    
+    toggleBtn.addEventListener("click", () => {
+      const isHidden = sidebar.classList.toggle("hidden");
+      resizeHandle.classList.toggle("hidden", isHidden);
+      toggleBtn.classList.toggle("active", isHidden);
+      localStorage.setItem("obsigate-sidebar-hidden", isHidden ? "true" : "false");
+    });
+  }
+
   // ---------------------------------------------------------------------------
   // Mobile sidebar
   // ---------------------------------------------------------------------------
@@ -1580,10 +1606,26 @@
 
     const container = el("div", { class: "search-results" });
     data.results.forEach((r) => {
+      // Create title with highlighting
+      const titleDiv = el("div", { class: "search-result-title" });
+      if (query && query.trim()) {
+        highlightSearchText(titleDiv, r.title, query, searchCaseSensitive);
+      } else {
+        titleDiv.textContent = r.title;
+      }
+      
+      // Create snippet with highlighting
+      const snippetDiv = el("div", { class: "search-result-snippet" });
+      if (query && query.trim() && r.snippet) {
+        highlightSearchText(snippetDiv, r.snippet, query, searchCaseSensitive);
+      } else {
+        snippetDiv.textContent = r.snippet || "";
+      }
+      
       const item = el("div", { class: "search-result-item" }, [
-        el("div", { class: "search-result-title" }, [document.createTextNode(r.title)]),
+        titleDiv,
         el("div", { class: "search-result-vault" }, [document.createTextNode(r.vault + " / " + r.path)]),
-        el("div", { class: "search-result-snippet" }, [document.createTextNode(r.snippet || "")]),
+        snippetDiv,
       ]);
 
       if (r.tags && r.tags.length > 0) {
@@ -1764,6 +1806,40 @@
     }
   }
 
+  function highlightSearchText(container, text, query, caseSensitive) {
+    container.textContent = "";
+    if (!query || !text) {
+      container.appendChild(document.createTextNode(text || ""));
+      return;
+    }
+
+    const source = caseSensitive ? text : text.toLowerCase();
+    const needle = caseSensitive ? query : query.toLowerCase();
+    let start = 0;
+    let index = source.indexOf(needle, start);
+
+    if (index === -1) {
+      container.appendChild(document.createTextNode(text));
+      return;
+    }
+
+    while (index !== -1) {
+      if (index > start) {
+        container.appendChild(document.createTextNode(text.slice(start, index)));
+      }
+      const mark = el("mark", { class: "search-highlight" }, [
+        document.createTextNode(text.slice(index, index + query.length)),
+      ]);
+      container.appendChild(mark);
+      start = index + query.length;
+      index = source.indexOf(needle, start);
+    }
+
+    if (start < text.length) {
+      container.appendChild(document.createTextNode(text.slice(start)));
+    }
+  }
+
   function showWelcome() {
     const area = document.getElementById("content-area");
     area.innerHTML = `
@@ -2015,6 +2091,7 @@
     document.getElementById("theme-toggle").addEventListener("click", toggleTheme);
     document.getElementById("header-logo").addEventListener("click", goHome);
     initSearch();
+    initSidebarToggle();
     initMobile();
     initVaultContext();
     initSidebarTabs();