ux: auto-size card, fix default font 404, add getGridOptions

[genebean]

I really like this card but the bugs were bothering me so I got Claude Code to help me make things better. This is the third of a set of 3 PRs that when combined are what I am now using at home. The first one is #40 and the second is #41

• Default width changed from 500 to 0 (auto); when width is not set the card fills its column width as a square, so it works in any layout without requiring a pixel value in the config
• @font-face is now only injected when the user provides a fontface config value; the previous default loaded ITCBLKAD.TTF from /local/ which produces a 404 for anyone who hasn't placed that file manually
• Default font changed to "Palatino Linotype, Palatino, Book Antiqua, serif" — a widely available system serif with a classic feel that suits the wizard theme without requiring a custom font file
• Add getGridOptions() so the card behaves correctly in the HA sections (grid) layout, reserving the right number of rows for its square shape
• Update getCardSize() to handle the auto-size case (falls back to availableWidth when configuredWidth is 0)