r202639: draw the reported position range

[cayossarian]

r202639: the grid draws the breaker positions the panel reports.

• The panel size is taken only when it is a positive integer. A panel that does not know its size reports 0, and the card took that as the size and refused to load. A size of 0, below zero, fractional or not a number now counts as absent, and the size comes from the circuits. The entity fallback reads its panel_size attribute the same way.
• Rows follow the reported positions. Topology may carry first_position and last_position. The grid draws one row per two positions over that range, labelled with the positions' own numbers. A range starting at 9 draws no slots 1 to 8, and a breaker above the panel size is drawn when the range reaches it. A panel that reports size 0 with its positions loads.
• Without reported positions the range is 1 to the size, as before. It always widens to every tab a circuit occupies, so no circuit is dropped.
• buildGridHTML takes a PositionRange in place of a row count. A 1 to 32 range renders byte-identical to a 32-space panel that reports no range.

The size check is its own first commit.

dist/ is not rebuilt here; the release rebuilds it.

Checks

• npm test: 592 passed in 57 files (561 in 56 before)
• npm run typecheck, npm run lint, node scripts/validate-i18n.mjs: clean
• npm run build: clean
• pre-commit hooks (prettier, eslint, typecheck, i18n) passed on every commit