fix: size the weather card to its content

The first draft placed every band at a fixed pixel offset and let the
arc absorb whatever height was left. In a 1x2 cell on this monitor that
is 794px of arc: a cathedral arch under a fifth of a card of content,
nothing like the mockup it was shaped after.

Three changes, all visible in an offscreen render of the real widget:

- Type sizes and band offsets scale with the rect, within clamps, so the
  proportions hold on the 1920 monitor as well as this one.
- The arc gets a bounded band that follows the stats instead of being
  pinned to the bottom, so no dead strip opens between them.
- The layout gives the widget a 1x1 cell. Its content is about 350px
  tall and a full-height cell cannot be filled without inventing data.

Found before restarting conky by loading conky's own cairo bindings
standalone and rendering the widget to a PNG, which is a far tighter
loop than install, restart, switch workspace, screenshot.

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

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