dangernoodle-io / TaipanMiner / 27079401987

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refactor(webui): migrate remaining components to Svelte 5 runes + CI guard (#516)

* refactor(webui): migrate remaining components to Svelte 5 runes + CI guard

converts the 14 remaining legacy $: components (App, Dashboard, System, and
the Donut/EfficiencyTile/FanEditDialog/Hero/LiveTitle/Nav/PoolStrip/RejectStrip/
RollingRates/Sparkline/StatTile components) plus Knot.svelte to runes mode:
$:->$derived/$effect, reactive let->$state, export let->$props(). Fixes the
class of bug where a legacy $: silently fails to track rune-backed state (the
Knot hard-reload bug). Adds a webui-check CI guard that fails on any '^\s*$:'
in webui src so legacy reactivity can't regress.

svelte-check 0 errors/0 warnings; 1109 tests pass; miner build clean.

* test(webui): restore coverage for runes-migrated components

- RollingRates: add generic-mode tests (values prop, unit rendering, null/zero/negative
  dash, empty unit suppression, showSpark=false) — exercises $derived(generic) and
  fmtVal branches that $derived(lazy) made invisible to the prior test set
- Sparkline: add single-point center-x test (n===1 branch in getX), custom color test
- System: tighten doResetStats async test with vi.waitFor on fetchStats/fetchPool to
  ensure the Promise.all body executes; add stratumFails row tests (stratum_fail_count
  > 0 renders '3 fails', 0 hides the row)

2842 of 3537 branches covered (80.35%)

Branch coverage included in aggregate %.

116 of 116 new or added lines in 15 files covered. (100.0%)

5422 of 5586 relevant lines covered (97.06%)

147866.96 hits per line