Drags server.cfg from the overlay root onto the cfg/ folder row,
asserts both that the file actually moved on disk AND that the tree
reflects the move after the debounced HTMX refresh of both parents.
Exercises the internal-drag path in uploads.js:332-366: the
custom-MIME setData/getData contract, the POST /files/move call,
and the dual scheduleRefresh(parentOf(src)) + scheduleRefresh(dst)
on success. Playwright's locator.drag_to() synthesizes setData
correctly — it relies on dataTransfer.getData(), NOT
webkitGetAsEntry which Playwright cannot fake.
Pitfalls handled inline: scoped the source/target locators to
li.file-tree-row-{file,dir} because action buttons inside the row
duplicate data-target-path + data-row-kind and would trip strict
mode. Used to_have_count instead of to_be_visible because cfg's
children div is collapsed (hidden) by default — the moved row is
in the DOM but not visually rendered until cfg is expanded.
Per docs/superpowers/plans/2026-05-17-files-overlay-e2e-handoff.md
(Tier 2 case C).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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