Replaces the full depth-first "scan everything, then render once + expandAll +
selectAll" walk (which looked stalled and was a render bomb on a large network
drive) with a progressive, breadth-first scan:
- Walks level-by-level behind a bounded worker pool (6), rendering as it goes —
the top folder levels appear immediately, deeper levels fill in the
background. Workers await between directories so the UI stays responsive.
- Live status line under the tree header: "Scanning… N folders · M files —
<current path>", ending "Scanned … in Ts."
- Per-folder state machine (pending → scanning → children → done) with
immediate subfolder/file counts; the row is greyed (with a faint pulse) until
its whole subtree is scanned, then turns solid — the at-a-glance signal.
- Opening a folder jumps its subtree to the front of the scan (ensureScanned),
so an opened folder always shows complete contents; idempotent vs the
background walk.
- No more auto-expand/auto-select-all (that loaded the entire drive up front);
the root is selected so the grid shows its files immediately.
- ZIPs stay expandable, scanned inline into virtual nodes (already in memory
once read); whole zip subtree marked done at once.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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