Release v0.1.3 — customize-mode polish, drag-drop polish, flyout fix · WordPress/wp-admin-sidebar

v0.1.3 lands the first batch of post-Reddit-launch design follow-ups, plus a small bug fix surfaced while testing them.

What changed

Plugin submenus collapse and stay closed during customize mode. When you click the Plugins customize icon, every plugin submenu in the sidebar collapses and hovering a row no longer opens its flyout — keeping the canvas calm while you reorder. On exit, your pre-customize hover state is restored. (#11)
Non-draggable rows are inert in customize mode. Reassignable items already had no link-follow on click (drag-drop intercepts) and a grab cursor — they read as edit-only. The rest of the sidebar (Dashboard, Posts, Pages, Users, etc.) now matches: no hover paint, no href follow. The .current (selected page) indicator stays visible so you still know where you are. Group headers stay interactive. (#24)

Ghost preview matches the source row's dimensions. No more "lifted = grown" effect — the floating preview uses the exact width and height of the row you grabbed, so alignment with drop targets is direct.
Drop indicator spans the full sidebar width. The half-width line is gone; the indicator now stretches edge-to-edge, making the insertion point unambiguous.
Row hover paint is suppressed during a drag. While you're dragging a plugin item, sidebar rows the cursor passes over no longer light up with their hover/selected state — the drop indicator is the single visual signal of where the item will land.
All three changes ship as (#12).

Submenu flyouts no longer clipped inside the Plugins group. Hovering a plugin item with submenus inside the expanded Plugins group used to swallow the flyout because the group's children container clipped overflow. The flyouts now appear correctly. (#22)

All four PHP test suites pass: test-grep-no-wpcom-tokens.php, test-signals.php (13/13), test-normalizer.php (7/7), test-rest.php (25/25).

GPL-2.0-or-later.