docs(window-switcher): cards fit both orientations, and grow to a ceiling

The card cannot take its shape from its preview. DP-3 reports transform=1,
so its windows are 1076x1916 portrait against 2556x1034 on DP-1, a 4.4x
span of aspect ratio in one grid, and a fullscreen app on that monitor is
portrait too. So the card is a fixed 16:10 box with the preview fitted
inside it, which keeps rows aligned; sizing each card to its own preview
would give ragged rows and break the alignment of the three text lines
that makes the grid scannable.

Cards now grow to fill their row up to 640px rather than sitting at a
fixed size, so a lone window is shown large without a preview becoming a
full-screen mirror of the window it stands for. Column count is the
window count capped at six, centred, so one card sits dead centre and two
straddle the middle.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SYg4wYHq5XNbiVmMeKRb1S

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