feat: add Provision IDE button for projects without a workspace

- POST /api/projects/[id]/workspace: provisions a Cloud Run Theia service
  on demand and saves the URL to the project record
- overview/page.tsx: shows 'Provision IDE' button when theiaWorkspaceUrl
  is null, 'Open IDE' link once provisioned
- Also fixes log spam: retired Firebase session tracking endpoint (410 Gone)

Co-authored-by: Cursor <cursoragent@cursor.com>

app/[workspace]/project/[projectId]/overview/page.tsx

@@ -124,6 +124,7 @@ export default function ProjectOverviewPage() {
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
   const [refreshing, setRefreshing] = useState(false);
+  const [provisioning, setProvisioning] = useState(false);
 
   const fetchProject = async () => {
     try {
@@ -153,6 +154,24 @@ export default function ProjectOverviewPage() {
     fetchProject();
   };
 
+  const handleProvisionWorkspace = async () => {
+    setProvisioning(true);
+    try {
+      const res = await fetch(`/api/projects/${projectId}/workspace`, { method: 'POST' });
+      const data = await res.json();
+      if (res.ok && data.workspaceUrl) {
+        toast.success('Workspace provisioned — starting up…');
+        await fetchProject();
+      } else {
+        toast.error(data.error || 'Failed to provision workspace');
+      }
+    } catch {
+      toast.error('An error occurred');
+    } finally {
+      setProvisioning(false);
+    }
+  };
+
   if (loading) {
     return (
       <div className="flex items-center justify-center py-32">
@@ -200,16 +219,21 @@ export default function ProjectOverviewPage() {
             <RefreshCw className={`h-4 w-4 mr-1.5 ${refreshing ? "animate-spin" : ""}`} />
             Refresh
           </Button>
-          <Button size="sm" asChild>
-            <a
-              href={project.theiaWorkspaceUrl ?? 'https://theia.vibnai.com'}
-              target="_blank"
-              rel="noopener noreferrer"
-            >
-              <Terminal className="h-4 w-4 mr-1.5" />
-              Open IDE
-            </a>
-          </Button>
+          {project.theiaWorkspaceUrl ? (
+            <Button size="sm" asChild>
+              <a href={project.theiaWorkspaceUrl} target="_blank" rel="noopener noreferrer">
+                <Terminal className="h-4 w-4 mr-1.5" />
+                Open IDE
+              </a>
+            </Button>
+          ) : (
+            <Button size="sm" onClick={handleProvisionWorkspace} disabled={provisioning}>
+              {provisioning
+                ? <><Loader2 className="h-4 w-4 mr-1.5 animate-spin" />Provisioning…</>
+                : <><Terminal className="h-4 w-4 mr-1.5" />Provision IDE</>
+              }
+            </Button>
+          )}
         </div>
       </div>