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refactor(history): decouple uplot chart; add tests (#379)

* refactor(webui): decouple history page from uplot

Extract chart config into lib/historyChart.ts (pure builders: windowFilter,
buildSeries, buildOptions, tooltipPlugin) and lifecycle into
lib/historyState.svelte.ts. History.svelte becomes a thin runes-mode shell.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* test(webui): cover history chart builders and state machine

- historyChart.test.ts: ~35 specs covering windowFilter, buildSeries,
  buildOptions structure, tooltipPlugin hooks (init, setCursor branches),
  and axis/series value formatters. 98.64% statement coverage.
- historyState.test.ts: ~25 specs covering initial state, selectWindow,
  mountChart, destroyChart, store-derived count/metrics, and resize.
- History.test.ts: rewritten as thin-shell render specs using vi.hoisted()
  stub state; covers empty/populated states, window button rendering,
  active class, mount/destroy lifecycle, and click delegation.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix(webui): cast uPlot plugin hooks to Function in tests

historyChart.test.ts was calling plugin.hooks.init!() and
plugin.hooks.setCursor!() directly, but uPlot types them as
ArraysOrFuncs (function | function[]), which svelte-check treats as
non-callable. Use (hook as Function)(args) via callInit/callSetCursor
helpers to satisfy the type checker.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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