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.

docs/_template/page.html

@@ -36,7 +36,7 @@
         <li><a href="__ROOT__manual/writing-specs/">Writing specs</a></li>
         <li><a href="__ROOT__manual/spec-language/">Spec language reference</a></li>
         <li><a href="__ROOT__manual/runs/">Runs</a></li>
-        <li><a href="__ROOT__manual/inspect/">Inspect</a></li>
+        <li><a href="__ROOT__manual/replay/">Replay</a></li>
         <li><a href="__ROOT__manual/cli/">CLI reference</a></li>
       </ul>
       <h3>Development</h3>