A space can be dragged out of its folder on the rail

[anxuanng]

What changed

A space can be dragged out of its folder on the rail (owner request: dragging a space below the last tile of a folder showed no bar and did nothing).

• Inside an open folder, dragging a space past either end, by half a tile, shows the drop bar just outside that end of the folder. Dropping there takes the space out of the folder and places it right above or below the folder.
• useReorder gets an onLeave option for that; a list without it keeps every row as before. While a row is on its way out, the others do not slide.
• A folder left with no spaces ends, as it already did when its last space was moved out from a menu.

How you checked it

• pnpm typecheck passes
• With a one-off Playwright script on the packaged build, off-screen: a folder of Two and Three; dragging Three below the folder marks the folder after and drops it out below (rail reads One, Folder 1, Two, Three, Four); dragging Two over the folder tile marks it before and drops it out above, which ends the folder. I looked at the screenshots, light and dark.
• Not run: the full pnpm test, and pnpm test:alignment (it needs the window on a display).
• Docs: docs/chat-guide.md
• I expect GitHub CI: required Windows desktop.yml (check name test); macOS and Linux also run

If an AI coding agent helped

Claude Code wrote this change; the rendered screens were reviewed before the pull request was opened.

🤖 Generated with Claude Code