Remember an independent 80-320 point size for import review thumbnails.
Reflow the grid without changing candidate checks, request density-aware
previews, and retain only nearby import textures and pending work.
Add control-channel access, interaction and persistence regressions, and
update the import guide, parity row and remaining loupe gap. This is the
thumbnail-size portion of #2056; pre-import loupe remains separate.
Correct Windows test portability issues exposed by the required gate:
a Unix-only import, export path comparisons and folder widget path ids.
Validation: cargo xtask ci; native control-channel acceptance including
small/large sizes, selection, short-window layout and restart persistence.
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