✨ New

New topology option. battery_hub routes everything through the battery, for power stations where only the battery feeds home (#123); isolated_battery drops the battery ↔ grid wire. standard stays the default. (#461)
Grid, battery and individual circles can take their own color while nothing flows, with color.idle (grid, battery) or color_idle (individual). display_zero_lines.grey_out_circles greys them out like idle lines instead. Covers #222. (#472)
Individual devices support secondary_info.sum_total, like solar. The secondary entity is added to the device's value, flow and subtract_individual, while the secondary info shows its own value. Covers the use case of #364. (#462)
Without a grid entity, the card drops the empty grid column and centres solar, battery and home by their visual weight, so battery and solar only setups no longer leave a gap on the left (#142). (#473)

🐛 Fixes

display_zero_lines.grey_color now applies in custom mode too, as documented. Before, idle lines in custom mode stayed the default grey. (#472)
Dots on short lines, like individual devices, no longer crawl next to the main lines: each line's dot time now scales with the square root of its length. Flow rates, including min_flow_rate, max_flow_rate and a fixed calculate_flow_rate, are seconds per 175px of line. (#467)

The card file is 2 to 5% smaller. Cards are now built with Vite+ instead of Rollup and Babel; they still run on the same browsers, including Chromecast and older tablets. (#471)

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Full Changelog: v0.4.1...v0.5.0