Fix issues #481, #484, #487, #488

[archanavdev]

Summary

This PR addresses four distinct UI/UX issues in a single branch to improve codebase consistency, ensure correct formatting, and add missing integration test coverage.

Scope

• Add helper for detecting if the current device is a mobile viewport #481: Added an unmount cleanup unit test to the useIsMobile integration test to ensure the window.matchMedia listener is correctly removed when the component unmounts.
• Add integration test for holder count formatting using K suffix above one thousand #484: Updated TrendingCreatorCard to use the formatHolderCount helper instead of .toLocaleString() for displaying the key supply, ensuring counts above 1000 properly use a "K" suffix. Also added TrendingCreatorCard.integration.test.tsx to assert this rendering logic.
• Add integration test for relative time label rendering correctly in activity feed entries #487: Refactored TransactionHistory (the activity feed) to use the centralized formatRelativeTime helper instead of a local utility. Added an integration test to TransactionHistory.test.tsx to verify that recent events show a "min ago" label while older events show a "days ago" label (and raw ISO strings are never rendered).
• Add helper for debouncing creator search input before firing API request #488: Verified that the useDebounce hook and its unit/integration tests are fully implemented, adequately covering value updates after the delay, rapid input changes, and unmount behavior.

Closes #481
Closes #484
Closes #487
Closes #488

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