docs: add the weather widget design

One vertical card merging idea1.png's two: conditions on top, a
sunrise-to-sunset arc at the bottom, with the times at the arc's ends
behind sunrise/sunset glyphs.

Decisions worth recording rather than rediscovering:

- The fetch runs from `${execi}` in conky.text, not a systemd timer, so
  refresh is tied to the dashboard's lifetime. conky.text is empty in
  this config because Cairo covers it, so whether execi fires at all was
  probed rather than assumed: it does, even when the command prints
  nothing.
- Inconsolata Nerd Font already carries the Weather Icons range and the
  two sunrise/sunset glyphs, so no new font. Confirmed by rendering the
  codepoints and looking at them; an fc-list query alone had wrongly
  reported them missing, and a missing glyph in conky is an invisible
  blank rather than an error.
- The cache is written atomically, since the widget reads it on an
  unrelated 2s cadence and would otherwise parse a half-written file.
- A bad key returns HTTP 200 with a JSON error body, so the fetch checks
  .cod before replacing the cache, and never overwrites good data with
  an error.
- Missing and stale states draw the normal card chrome with a notice. An
  empty cell was rejected: it looks exactly like a crashed widget.

Also ignores .superpowers/, the brainstorming session directory.

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

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