codeSplitters: at half-screen width the file explorer spills over the editor #631

At a half-screen window (about 730px wide), an open file's page stacks the explorer above the editor, but the explorer's file list keeps going past its box and draws on top of the file's toolbar, the Here now chips and the code. Seen by the owner while testing #609 (quinn/rustybuns, README.md).

Likely cause: under @media (max-width: 860px) in apps/codesplitters/src/client.html (around line 633), .explorer gets max-height: 220px but no overflow, so the tree overflows instead of scrolling. Probably overflow: auto there (maybe with a collapse toggle), then check 860px, ~730px and phone widths, with a long tree like RustyBuns'.

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