replay ui fix (#56)

* refactor: rename inspect to replay across the codebase

Renames inspect-ui/ to replay-ui/, internal/inspect/ to internal/replay/,
the CLI subcommand from `sanderling inspect` to `sanderling replay`, and
updates all references in docs, Makefile, README, and Go comments.

* feat(replay-ui): show spec filename with full path on hover

RunList and RunDetail now render the basename of spec_path (e.g.
login.spec.ts) with the full path available as a title tooltip.

replay-ui/src/App.tsx

@@ -0,0 +1,32 @@
+import { BrowserRouter, Navigate, Route, Routes, useParams } from "react-router-dom";
+import RunList from "./routes/RunList";
+import RunDetail from "./routes/RunDetail";
+
+function RunIndexRedirect() {
+  const { id } = useParams<{ id: string }>();
+  if (!id) {
+    return <NotFound />;
+  }
+  return <Navigate to={`/runs/${id}/steps/1`} replace />;
+}
+
+function NotFound() {
+  return <div className="status-block">not found</div>;
+}
+
+export default function App() {
+  return (
+    <BrowserRouter>
+      <div className="app-shell">
+        <main className="app-main">
+          <Routes>
+            <Route path="/" element={<RunList />} />
+            <Route path="/runs/:id" element={<RunIndexRedirect />} />
+            <Route path="/runs/:id/steps/:step" element={<RunDetail />} />
+            <Route path="*" element={<NotFound />} />
+          </Routes>
+        </main>
+      </div>
+    </BrowserRouter>
+  );
+}