test(hub): the folder-name test was reading the ".." row

`test_a_folder_name_carries_no_trailing_slash` sliced from the first
`dir-row` in files-app.js. Since the parent-directory row was added, that
is the ".." row, whose only cell is an ellipsis — so the slice contained
no `${d}` and the test failed on a name it had never looked at. The
directory row itself has always rendered `${d}` with no trailing slash.

Anchored on `key=${full}` instead, with an assertion that the anchor
still lands on a `dir-row` so the next move fails loudly rather than
silently reading the wrong markup again.

Pre-existing: it fails the same way on main.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011pvMdvLBG92jyhvD5pD6us

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