fix(chart) :: align stacked series on their X values

[81reap]

Addresses #1362

Motivation

• ApexCharts stacks series by point order, not by x value, so a series missing a point is piled on top of the wrong one.
• The chart then shows totals that are in nobody's data, without any warning.
• SQLPage already aligned series on their x values, but only for bar charts on a text axis.

Description

• Move that alignment into sqlpage/chart_series.js as align_series, which gives every series a point at every x any of them has, and counts a missing one as zero.
• Order the merged axis by what the series already agree on, falling back to ascending order where they diverge, so one unsorted series cannot reorder the chart.
• Align whenever a chart is stacked, on top of the existing bar-on-a-text-axis case.
• Teach build.rs a /* !include ./file.js */ directive, next to the one it already has for CDN scripts, so chart_series.js is inlined ahead of apexcharts.js.
• Add tests/js/, run by Node's test runner from npm test, since this logic is worth testing without a browser.
• Document the behaviour on the stacked parameter, and add the stacked area example from stacked area graphs / stacked line graphs #1362.
• Add a changelog entry.

Testing

• 13 unit tests cover the merge order, dates compared by value, a null treated as missing, and the input left unmutated.
• The browser suite passes 33 tests, five of them new, including a stacked area chart whose series do not share their x values.
• npm test checks 41 files and reports nothing.
• no console errors on card page fails for the reason described in fix(biome.js) :: fix remaining lint issues #1366, on this branch and on the unmodified base alike.

---

GitHub cannot base a pull request on a branch that lives in a fork, so all eight target main and each one carries the commits of those above it. Review and merge them in order:

1. fix(biome.js) :: fix remaining lint issues #1366 :: fix(biome.js) :: fix remaining lint issues
2. fix(modal) :: give modal component an accessible name #1367 :: fix(modal) :: give modal component an accessible name
3. fix(map) :: ignore map coordinates that are not a pair of numbers #1368 :: fix(map) :: ignore map coordinates that are not a pair of numbers
4. feat(chart) :: render column charts as bar charts #1369 :: feat(chart) :: render column charts as bar charts
5. fix(chart) :: align stacked series on their X values #1370 :: fix(chart) :: align stacked series on their X values ← this PR
6. fix(chart) :: line series up on a category axis for every chart type #1371 :: fix(chart) :: line series up on a category axis for every chart type
7. fix(npm) :: install dependencies only once at root level #1372 :: fix(npm) :: install dependencies only once at root level
8. feat(typescript) :: typecheck browser JavaScript in CI #1373 :: feat(typescript) :: typecheck browser JavaScript in CI

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