fix(useSmartPolling): handle enabled state toggling and stabilize callback closures (#570)

[PINYOPATTANAWASANPORN]

Summary of Changes

• Fix useSmartPolling lifecycle when toggling enabled dynamically between true and false (#570).
• Wrap fetchFn, compareFn, and onDataChange options in stable React refs to prevent spurious interval teardowns on component re-renders (#568).
• Update running setInterval dynamically when exponential backoff scales interval (#569).
• Add comprehensive Jest/React Testing Library test suite in src/hooks/useSmartPolling.test.ts.

Root Cause / Technical Context

Previously, useSmartPolling relied on an unmanaged hasInitialized ref guard and lacked state dispatches on disabled cleanup, which caused isPolling to remain true when disabled and prevented interval restart when toggling enabled back to true.

Verification & Testing

• Unit tests cover:
  1. Starting polling on mount with enabled=true.
  2. Stopping polling and clearing intervals when enabled flips to false.
  3. Seamlessly restarting polling and re-arming intervals when enabled toggles back to true.
  4. Callback stabilization across re-renders.

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