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refactor(pool): extract state machine + helpers; add tests (#372)

* refactor(webui): extract pool page state machine

- extract PoolForm type, slotFromCurrent, slotFromForm, waitForFreshSession
  into poolHelpers.ts (pure module, 100% testable)
- extract createPoolState() factory with svelte 5 runes into
  poolState.svelte.ts; imports api wrappers + pool store directly
- pool.svelte shrinks to thin shell (~230 LOC vs 634); all state
  transitions, message strings, freeze-and-poll session logic preserved

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

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

- poolHelpers.test.ts: 100% coverage of slotFromCurrent, slotFromForm,
  waitForFreshSession, defaultForm (13 specs including fake timer tests)
- poolState.test.ts: 97.89% coverage of createPoolState() factory via
  mocked api + pool store (46 specs covering all actions, error paths,
  frozenPool lifecycle, setter round-trips)
- Pool.svelte: 82.45% statements (was 60.82%); total tests 716 (was 671)

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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