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/__tests__/api.test.ts

@@ -0,0 +1,10 @@
+import { describe, it, expect } from "bun:test";
+import { screenshotUrl } from "../api";
+
+describe("screenshotUrl", () => {
+  it("encodes runId and name", () => {
+    expect(screenshotUrl("run-1", "step-00001.png")).toBe(
+      "/api/runs/run-1/screenshots/step-00001.png",
+    );
+  });
+});