feat(web): long-range trend chart (min/max band + average) - #45
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…m page Add a long-range chart backed by the hourly trend rollups: a min/max band with the average line, so an item's long-term shape stays visible after raw samples are pruned by retention. Sits alongside the raw-history chart on the item page. - charts.py: a pure `band_chart` helper → SVG geometry (avg polyline + a band polygon from the max edge then the min edge), with axis ticks; flat/too-few-points handled. - Item page renders it from up to ~30 days of trends (numeric items only). Tests: band geometry (line + band point counts, value range) and the item-page render. Full suite 221 passed; ruff + mypy(strict) green.
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Context
Phase 4 follow-up — long-range charts backed by trends (the trends from #28 finally
get a long-term visual consumer).
Changes
band_chart(pure, unit-tested): SVG geometry for an average polyline + a min/maxband polygon, with axis ticks.
alongside the existing raw-history chart. Long-term shape survives raw-sample retention.
Tests
Band geometry + the item-page render. Full suite 221 passed; ruff + mypy(strict)
green. Screenshot in the README.