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/main.tsx

@@ -0,0 +1,13 @@
+import React from "react";
+import { createRoot } from "react-dom/client";
+import App from "./App";
+
+const container = document.getElementById("root");
+if (!container) {
+  throw new Error("missing #root element");
+}
+createRoot(container).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+);