feat: titlebar icon for sidebar toggle first try

src/renderer/components/TabBar/TabBar.css

@@ -45,29 +45,6 @@
   background-color: var(--vscode-toolbar-hoverBackground, rgba(90, 93, 94, 0.31));
 }
 
-/* Sidebar toggle button */
-.tab-bar-toggle-sidebar {
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  width: 35px;
-  height: 100%;
-  background-color: transparent;
-  border: none;
-  border-right: 1px solid var(--vscode-tab-border, #252526);
-  color: var(--vscode-icon-foreground, #c5c5c5);
-  cursor: pointer;
-  flex-shrink: 0;
-}
-
-.tab-bar-toggle-sidebar:hover {
-  background-color: var(--vscode-toolbar-hoverBackground, rgba(90, 93, 94, 0.31));
-}
-
-.tab-bar-toggle-sidebar:active {
-  background-color: var(--vscode-toolbar-activeBackground, rgba(99, 102, 103, 0.31));
-}
-
 .tab-scroll-left {
   border-right: 1px solid var(--vscode-tab-border, #252526);
 }

src/renderer/components/TabBar/TabBar.tsx

@@ -161,7 +161,6 @@ export const TabBar: React.FC = () => {
     media,
     activeProject,
     dirtyPosts,
-    sidebarVisible,
     toggleSidebar,
     setActiveTab, 
     closeTab,
@@ -475,18 +474,6 @@ export const TabBar: React.FC = () => {
 
   return (
     <div className="tab-bar">
-      <button
-        className="tab-bar-toggle-sidebar"
-        onClick={toggleSidebar}
-        title={`${sidebarVisible ? 'Hide' : 'Show'} Sidebar (Ctrl+B)`}
-      >
-        <svg width="16" height="16" viewBox="0 0 16 16" fill="currentColor">
-          <path d="M0 1h16v14H0V1zm1 1v12h4V2H1zm5 0v12h9V2H6z"/>
-          {!sidebarVisible && <path d="M2 4h2v1H2V4zm0 2h2v1H2V6zm0 2h2v1H2V8z" opacity="0.5"/>}
-          {sidebarVisible && <path d="M2 4h2v1H2V4zm0 2h2v1H2V6zm0 2h2v1H2V8z"/>}
-        </svg>
-      </button>
-      
       {showLeftArrow && (
         <button 
           className="tab-scroll-button tab-scroll-left"

src/renderer/components/WindowTitleBar/WindowTitleBar.css

@@ -0,0 +1,48 @@
+.window-titlebar {
+  height: 34px;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  background-color: var(--vscode-editorGroupHeader-tabsBackground, #252526);
+  border-bottom: 1px solid var(--vscode-editorGroupHeader-tabsBorder, #1e1e1e);
+  flex-shrink: 0;
+  -webkit-app-region: drag;
+}
+
+.window-titlebar-drag-region {
+  flex: 1;
+  height: 100%;
+}
+
+.window-titlebar-actions {
+  height: 100%;
+  display: flex;
+  align-items: center;
+  margin-right: 8px;
+}
+
+.window-titlebar-action-button {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  background: transparent;
+  border: none;
+  color: var(--vscode-titleBar-activeForeground, var(--vscode-icon-foreground, #c5c5c5));
+  cursor: pointer;
+  border-radius: 4px;
+  -webkit-app-region: no-drag;
+}
+
+.window-titlebar-action-button svg {
+  display: block;
+}
+
+.window-titlebar-action-button:hover {
+  background-color: var(--vscode-toolbar-hoverBackground, rgba(90, 93, 94, 0.31));
+}
+
+.window-titlebar-action-button:active {
+  background-color: var(--vscode-toolbar-activeBackground, rgba(99, 102, 103, 0.31));
+}

src/renderer/components/WindowTitleBar/WindowTitleBar.tsx

@@ -0,0 +1,33 @@
+import React from 'react';
+import { useAppStore } from '../../store';
+import './WindowTitleBar.css';
+
+export const WindowTitleBar: React.FC = () => {
+  const { sidebarVisible, toggleSidebar } = useAppStore();
+
+  return (
+    <div className="window-titlebar" data-testid="window-titlebar">
+      <div className="window-titlebar-drag-region" />
+      <div className="window-titlebar-actions">
+        <button
+          className="window-titlebar-action-button"
+          aria-label="Toggle Sidebar"
+          onClick={toggleSidebar}
+          title={`${sidebarVisible ? 'Hide' : 'Show'} Sidebar (Ctrl+B)`}
+        >
+          <svg width="16" height="16" viewBox="0 0 16 16" aria-hidden="true">
+            <path
+              d="M3 3.75A1.75 1.75 0 0 1 4.75 2h6.5A1.75 1.75 0 0 1 13 3.75v8.5A1.75 1.75 0 0 1 11.25 14h-6.5A1.75 1.75 0 0 1 3 12.25v-8.5z"
+              fill="none"
+              stroke="currentColor"
+              strokeWidth="1"
+            />
+            <path d="M4.5 3.5h3.75v9H4.5z" fill="currentColor"/>
+          </svg>
+        </button>
+      </div>
+    </div>
+  );
+};
+
+export default WindowTitleBar;

src/renderer/components/WindowTitleBar/index.ts

@@ -0,0 +1 @@
+export { WindowTitleBar } from './WindowTitleBar';

src/renderer/components/index.ts

@@ -22,3 +22,4 @@ export { AISuggestionsModal, type AISuggestions, type CurrentValues } from './AI
 export { ChatPanel } from './ChatPanel';
 export { ImportAnalysisView } from './ImportAnalysisView';
 export { InsertModal } from './InsertModal';
+export { WindowTitleBar } from './WindowTitleBar';