fix(hooks): reschedule active timer when polling backoff applies (#569)

[PINYOPATTANAWASANPORN]

Summary of Changes

• Updated useSmartPolling (src/hooks/useSmartPolling.ts) to immediately reschedule the active setInterval timer when backoff calculation increases currentIntervalRef.current or when a data change / refetch() resets it back to base interval.
• Added fake-timer unit test in src/hooks/useSmartPolling.test.ts verifying that setInterval is rescheduled and delay between poll requests expands when backing off.

Root Cause / Technical Context

Previously, updating currentIntervalRef.current on backoff threshold reached had no effect on the running setInterval timer because setInterval captures its delay duration when created. As a result, polling continued at the base frequency even though isBackingOff reported true.

Verification & Testing

• Executed Jest test runner locally with Exit Code 0:

$ npx jest src/hooks/useSmartPolling.test.ts --coverage=false
# PASS src/hooks/useSmartPolling.test.ts
# Test Suites: 1 passed, 1 total
# Tests:       4 passed, 4 total

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