🤖 Add mobile-responsive sidebar with overlay and hamburger menu

src/App.tsx

@@ -59,6 +59,29 @@ const globalStyles = css`
     -moz-osx-font-smoothing: grayscale;
   }
 
+  /* Mobile: Improve touch interactions */
+  @media (max-width: 768px) {
+    html {
+      /* Prevent text size adjustment on orientation change */
+      -webkit-text-size-adjust: 100%;
+      /* Improve tap responsiveness */
+      touch-action: manipulation;
+    }
+
+    body {
+      /* Slightly larger font for better readability on mobile */
+      font-size: 15px;
+    }
+
+    /* Make buttons and interactive elements easier to tap */
+    button,
+    a,
+    [role="button"] {
+      min-height: 44px;
+      min-width: 44px;
+    }
+  }
+
   code {
     font-family: var(--font-monospace);
   }
@@ -135,19 +158,35 @@ const AppContainer = styled.div`
   height: 100vh;
   overflow: hidden;
   background: #1e1e1e;
+
+  /* Mobile: Ensure content takes full width */
+  @media (max-width: 768px) {
+    flex-direction: column;
+  }
 `;
 
 const MainContent = styled.div`
   flex: 1;
   display: flex;
   flex-direction: column;
   overflow: hidden;
+  min-width: 0; /* Allow content to shrink below its minimum content size */
+
+  /* Mobile: Take full width */
+  @media (max-width: 768px) {
+    width: 100%;
+  }
 `;
 
 const ContentArea = styled.div`
   flex: 1;
   display: flex;
   overflow: hidden;
+
+  /* Mobile: Stack content vertically if needed */
+  @media (max-width: 768px) {
+    flex-direction: column;
+  }
 `;
 
 const WelcomeView = styled.div`
@@ -186,7 +225,10 @@ function AppInner() {
   );
   const [workspaceModalLoadError, setWorkspaceModalLoadError] = useState<string | null>(null);
   const workspaceModalProjectRef = useRef<string | null>(null);
-  const [sidebarCollapsed, setSidebarCollapsed] = usePersistedState("sidebarCollapsed", false);
+
+  // Auto-collapse sidebar on mobile by default
+  const isMobile = typeof window !== "undefined" && window.innerWidth <= 768;
+  const [sidebarCollapsed, setSidebarCollapsed] = usePersistedState("sidebarCollapsed", isMobile);
 
   const handleToggleSidebar = useCallback(() => {
     setSidebarCollapsed((prev) => !prev);

src/components/AIView.tsx

@@ -41,13 +41,24 @@ const ViewContainer = styled.div`
   overflow-x: auto;
   overflow-y: hidden;
   container-type: inline-size;
+
+  /* Mobile: Stack vertically */
+  @media (max-width: 768px) {
+    flex-direction: column;
+  }
 `;
 
 const ChatArea = styled.div`
   flex: 1;
   min-width: 400px; /* Reduced from 750px to allow narrower layout when Review panel is wide */
   display: flex;
   flex-direction: column;
+
+  /* Mobile: Remove min-width and take full width */
+  @media (max-width: 768px) {
+    min-width: 0;
+    width: 100%;
+  }
 `;
 
 const ViewHeader = styled.div`
@@ -57,6 +68,13 @@ const ViewHeader = styled.div`
   display: flex;
   justify-content: space-between;
   align-items: center;
+
+  /* Mobile: Add padding for hamburger button and adjust spacing */
+  @media (max-width: 768px) {
+    padding: 8px 15px 8px 60px; /* Extra left padding for hamburger button */
+    flex-wrap: wrap;
+    gap: 8px;
+  }
 `;
 
 const WorkspaceTitle = styled.div`

src/components/LeftSidebar.tsx

@@ -17,6 +17,71 @@ const LeftSidebarContainer = styled.div<{ collapsed?: boolean }>`
   flex-shrink: 0;
   transition: width 0.2s ease;
   overflow: hidden;
+  position: relative;
+  z-index: 100;
+
+  /* Mobile: Sidebar becomes overlay */
+  @media (max-width: 768px) {
+    position: fixed;
+    left: 0;
+    top: 0;
+    width: 280px;
+    z-index: 1000;
+    transform: ${(props) => (props.collapsed ? "translateX(-100%)" : "translateX(0)")};
+    transition: transform 0.3s ease;
+    box-shadow: ${(props) => (props.collapsed ? "none" : "2px 0 8px rgba(0, 0, 0, 0.5)")};
+  }
+`;
+
+const Overlay = styled.div<{ visible: boolean }>`
+  display: none;
+
+  /* Mobile: Show overlay backdrop when sidebar is open */
+  @media (max-width: 768px) {
+    display: ${(props) => (props.visible ? "block" : "none")};
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background: rgba(0, 0, 0, 0.5);
+    z-index: 999;
+    backdrop-filter: blur(2px);
+  }
+`;
+
+const HamburgerButton = styled.button`
+  display: none;
+
+  /* Mobile: Show hamburger menu */
+  @media (max-width: 768px) {
+    display: flex;
+    position: fixed;
+    top: 12px;
+    left: 12px;
+    z-index: 998;
+    width: 40px;
+    height: 40px;
+    background: #252526;
+    border: 1px solid #3c3c3c;
+    border-radius: 6px;
+    cursor: pointer;
+    align-items: center;
+    justify-content: center;
+    color: #cccccc;
+    font-size: 20px;
+    transition: all 0.2s;
+    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
+
+    &:hover {
+      background: #2a2a2b;
+      border-color: #4c4c4c;
+    }
+
+    &:active {
+      transform: scale(0.95);
+    }
+  }
 `;
 
 interface LeftSidebarProps {
@@ -46,12 +111,33 @@ interface LeftSidebarProps {
 }
 
 export function LeftSidebar(props: LeftSidebarProps) {
-  const { collapsed, ...projectSidebarProps } = props;
+  const { collapsed, onToggleCollapsed, ...projectSidebarProps } = props;
 
   return (
-    <LeftSidebarContainer collapsed={collapsed}>
-      {!collapsed && <TitleBar />}
-      <ProjectSidebar {...projectSidebarProps} collapsed={collapsed} />
-    </LeftSidebarContainer>
+    <>
+      {/* Hamburger menu button - only visible on mobile */}
+      {collapsed && (
+        <HamburgerButton
+          onClick={onToggleCollapsed}
+          title="Open sidebar"
+          aria-label="Open sidebar menu"
+        >
+          ☰
+        </HamburgerButton>
+      )}
+
+      {/* Overlay backdrop - only visible on mobile when sidebar is open */}
+      <Overlay visible={!collapsed} onClick={onToggleCollapsed} />
+
+      {/* Sidebar */}
+      <LeftSidebarContainer collapsed={collapsed}>
+        {!collapsed && <TitleBar />}
+        <ProjectSidebar
+          {...projectSidebarProps}
+          collapsed={collapsed}
+          onToggleCollapsed={onToggleCollapsed}
+        />
+      </LeftSidebarContainer>
+    </>
   );
 }

src/components/RightSidebar.tsx

@@ -54,6 +54,16 @@ const SidebarContainer = styled.div<SidebarContainerStyleProps>`
     z-index: 10;
     box-shadow: -2px 0 4px rgba(0, 0, 0, 0.2);
   `}
+
+  /* Mobile: Full width when expanded, hide when collapsed */
+  @media (max-width: 768px) {
+    width: ${(props) => (props.collapsed ? "0" : "100%")};
+    border-left: none;
+    border-top: 1px solid #3e3e42;
+    max-height: ${(props) => (props.collapsed ? "0" : "50vh")};
+    position: ${(props) => (props.collapsed ? "absolute" : "relative")};
+    bottom: ${(props) => (props.collapsed ? "0" : "auto")};
+  }
 `;
 
 const FullView = styled.div<{ visible: boolean }>`