🐛 Fix missing isRefreshing in NetworkPolicyCoverage card

[clubanderson]

Summary

• Destructure isRefreshing from useCachedPods() and pass it to useCardLoadingState() in the NetworkPolicyCoverage card
• Without this, the card does not show the background refresh indicator when cached data is being updated, inconsistent with the established pattern used by other cards (e.g., WarningEvents, ClusterGroups)

Fixes #4001

Test plan

• Verify the NetworkPolicyCoverage card shows the refreshing indicator during background data updates
• Verify no regressions in card loading/skeleton states
• Verify build passes (npm run build)

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Pull request overview

This PR fixes the NetworkPolicyCoverage card’s loading-state wiring so it can display the background refresh indicator during stale-while-revalidate updates, aligning it with the established useCardLoadingState pattern used across other cards.

Changes:

• Destructures isRefreshing from useCachedPods().
• Passes isRefreshing into useCardLoadingState() so CardWrapper can show the refresh state while cached data is being updated.