fix: pause leaderboard polling when tab is hidden using Page Visibili…

[5hivam123]

Description

Replaced the always-running setInterval with a Page Visibility API implementation that pauses polling when the browser tab is hidden and resumes immediately when the user switches back to the tab — saving unnecessary bandwidth and API calls.

Linked Issue

Fixes #172

Changes Made

• Removed direct setInterval(fetchLeaderboardData, 2 * 60 * 1000) call
• Added startPolling() and stopPolling() helper functions
• Added visibilitychange event listener to pause/resume polling based on tab visibility
• On tab becoming visible, triggers an immediate fetch before resuming interval

Type of Change

• Bug fix
• New feature
• UI/Visual update
• Documentation update
• Refactor

Testing

• Tested locally
• Tested on mobile viewport (if applicable)
• No console errors introduced

Checklist

• My code follows the project's coding style
• I have formatted my code locally by running npx prettier --write . before submitting
• I am submitting my PR from a dedicated feature/* branch, not the main branch
• I have performed a self-review of my code
• My changes generate no new warnings or errors
• I have updated documentation if required
• I have linked the relevant issue

Screenshots / Screen Recording

Before: Network requests fired every 2 minutes regardless of tab visibility.

After: Network requests pause when tab is hidden, resume immediately on tab focus.

Tested via DevTools → Network tab by switching browser tabs and confirming no fetch calls during hidden state.

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[jagdish-15]

/format

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