feat: make the clock fill whatever cell it is given

The numerals scaled off the cell but the date block sat at a fixed drop
below them, so a tall cell left a dead band under the date and a short
one would have collided. Now the date pins to the bottom edge, the
numerals take everything above it, and both type sizes derive from the
width, so the slack of a tall cell falls in the middle of the card where
it belongs.

Type scales off width for the same reason the weather card does: height
is what changes when a row is added to the grid, and a widget that
shrinks its text whenever its cell gets shorter reads as broken next to
its neighbours.

Checked at 1x3, 1x6, 2x2, 2x4 and 3x3 on an 8x6 grid before restarting
conky. The 1x6 case stays width-bound and leaves room below the
numerals, which is correct for a cell far taller than it is wide.

The README now states the convention, since it applies to every widget
added later: derive offsets from the rect, scale off width, decide where
the slack goes, and drop an element that would otherwise overlap.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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