feat(window): resize the split with C-; b <arrow>

`C-; b <left>/<right>/<up>/<down>' moves the active window's divider that way (via `windsize'), then keeps `cj/window-resize-map' active so bare arrows keep nudging until any other key (or `C-g'/`<escape>'). `C-u N C-; b <right>' resizes by N.

windsize was on `C-s-<arrow>' (Ctrl+Super), which a tiling WM intercepts, so those keys were useless. I dropped that binding. The package is now `:commands'-deferred, and `windsize-cols'/`windsize-rows' drop to 2 (8/4 overshoots in a held nudge loop). `cj/window-resize-sticky' dispatches on the arrow that triggered it and arms the loop.

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