Fix workspace metadata lookups in App.tsx and ProjectSidebar

The workspaceMetadata map is keyed by workspace ID, not path.
Extract the workspace ID from workspace.path before looking up metadata.

This fixes E2E test failures where workspaces weren't appearing.

Author: ammar-agent

src/App.tsx

@@ -321,8 +321,11 @@ function AppInner() {
         result.set(
           projectPath,
           config.workspaces.slice().sort((a, b) => {
-            const aMeta = workspaceMetadata.get(a.path);
-            const bMeta = workspaceMetadata.get(b.path);
+            // Extract workspace ID from path
+            const aId = a.path.replace(/\\/g, "/").split("/").pop() || "";
+            const bId = b.path.replace(/\\/g, "/").split("/").pop() || "";
+            const aMeta = workspaceMetadata.get(aId);
+            const bMeta = workspaceMetadata.get(bId);
             if (!aMeta || !bMeta) return 0;
 
             // Get timestamp of most recent user message (0 if never used)
@@ -374,7 +377,9 @@ function AppInner() {
       const targetWorkspace = sortedWorkspaces[targetIndex];
       if (!targetWorkspace) return;
 
-      const metadata = workspaceMetadata.get(targetWorkspace.path);
+      // Extract workspace ID from path
+      const workspaceId = targetWorkspace.path.replace(/\\/g, "/").split("/").pop() || "";
+      const metadata = workspaceMetadata.get(workspaceId);
       if (!metadata) return;
 
       setSelectedWorkspace({

src/components/ProjectSidebar.tsx

@@ -823,10 +823,9 @@ const ProjectSidebarInner: React.FC<ProjectSidebarProps> = ({
                             {(sortedWorkspacesByProject.get(projectPath) ?? config.workspaces).map(
                               (workspace) => {
                                 // Extract workspace ID from path (path format: ~/.cmux/src/projectName/workspaceId)
-                                const workspaceId =
-                                  workspace.path.split("/").pop() ??
-                                  workspace.path.split("\\").pop() ??
-                                  "";
+                                // Handle both Unix (/) and Windows (\) path separators
+                                const pathParts = workspace.path.replace(/\\/g, "/").split("/");
+                                const workspaceId = pathParts[pathParts.length - 1] || "";
                                 const metadata = workspaceMetadata.get(workspaceId);
                                 if (!metadata) return null;
                                 const isSelected =