aero: fix 1:1 drag at non-1.0 zoom, scale window text on resize

Drag and resize handlers were reading pointer deltas in visual pixels
but writing to style.left/width which live in the (zoomed) layout
coord space — so dragging at zoom 0.7 lagged 30% behind the cursor.
Now divide deltas by window.__uiScale (set by the desktop-fit script).

Also: when a window is resized, scale its title bar and body via
`zoom` so the text inside grows/shrinks with the window. Baseline is
captured on first resize.

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