Add React UI with Vite

Dashboard, agents, goals, issues, and projects pages with sidebar
navigation. API client layer, custom hooks, and shared layout
components. Built with Vite and TypeScript.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/pages/Projects.tsx

@@ -0,0 +1,35 @@
+import { useCallback } from "react";
+import { projectsApi } from "../api/projects";
+import { useApi } from "../hooks/useApi";
+import { formatDate } from "../lib/utils";
+
+export function Projects() {
+  const fetcher = useCallback(() => projectsApi.list(), []);
+  const { data: projects, loading, error } = useApi(fetcher);
+
+  return (
+    <div>
+      <h2 className="text-2xl font-bold mb-4">Projects</h2>
+      {loading && <p className="text-gray-500">Loading...</p>}
+      {error && <p className="text-red-600">{error.message}</p>}
+      {projects && projects.length === 0 && <p className="text-gray-500">No projects yet.</p>}
+      {projects && projects.length > 0 && (
+        <div className="grid gap-4">
+          {projects.map((project) => (
+            <div key={project.id} className="bg-white rounded-lg border border-gray-200 p-4">
+              <div className="flex items-center justify-between">
+                <div>
+                  <h3 className="font-semibold">{project.name}</h3>
+                  {project.description && (
+                    <p className="text-sm text-gray-500 mt-1">{project.description}</p>
+                  )}
+                </div>
+                <span className="text-sm text-gray-400">{formatDate(project.createdAt)}</span>
+              </div>
+            </div>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}