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refactor(update): extract ota state machine + helpers; add tests (#374)

* refactor(webui): extract update page state machine

- extract otaHelpers.ts: firmwareName() and minerBusy() pure helpers
- extract otaState.svelte.ts: createOtaState() runes state machine
- Update.svelte: thin shell using const os = createOtaState()
- replace $: reactive blocks with $derived; local bindings use $state
- dev mock panel stays inline in Update.svelte (out of scope to extract)
- all 716 unit tests pass; all 33 e2e tests pass

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* test(webui): cover ota state machine and helpers

- otaHelpers.test.ts: 100% coverage — firmwareName (null/board variants),
  minerBusy (all rebooting/install/upload combinations)
- otaState.test.ts: ~30 specs covering initial state, handleCheck (happy
  path, pending retry, timeout, error), requestInstall/requestUpload,
  handleInstall (full flow, progress, error states, 600s deadline),
  handleUpload (full flow, progress, error), onFileSelect, onDrop,
  onDragOver/onDragLeave, setter round-trips
- Update.test.ts: rewritten to mock createOtaState; drives via global
  store state to cover UI conditional branches (install button, progress
  bars, minerBusy disabling, status messages)
- all 745 unit tests pass; all 33 e2e tests pass

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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