Premium Analytics: port Stats Clicks widget

[dognose24]

Fixes WOOA7S-1494

Proposed changes

• Add the Premium Analytics Clicks widget as a self-contained registered widget.
• Render clicked-link stats with the shared leaderboard UI, comparison deltas, loading, empty, and error states.
• Add Storybook stories, Storybook stats mocks, unit tests, and a changelog entry for the new widget.

Related product discussion/links

• WOOA7S-1494

Does this pull request change what data or activity we track or use?

No. This reads existing Jetpack Stats clicks data through the existing Premium Analytics stats data layer.

Testing instructions

• Run pnpm --dir projects/packages/premium-analytics test -- --runTestsByPath widgets/clicks/__tests__/clicks.test.tsx --runInBand.
• Run pnpm --dir projects/packages/premium-analytics typecheck.
• Open Storybook and visit Packages/Premium Analytics/Widgets/Clicks.
• Verify the Default, WithComparison, LoadingState, ErrorState, EmptyState, WithMockRows, and WidgetDashboardWithWidget stories render as expected.
• Run jetpack test js packages/premium-analytics (skips because packages/premium-analytics does not define a test-js script in composer.json).
• I did not verify the widget in a browser-backed Storybook session locally.

[github-actions]

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Premium Analytics plugin:

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[jp-launch-control]

Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

Full summary · PHP report

[chihsuan]

I did not verify the widget in a browser-backed Storybook session locally.

Would you be able to verify? 😅

Two things show up in the rendered widget that are worth fixing first:

1. The leaderboard isn't sorted (the 3K developer.wordpress.org/reference row renders third.)
2. The "opens in new tab" arrow is orphaned onto its own line under each label

Also left a few non-blocking notes.