Adds a tooltip to the campaign details chart

[j6ll]

Proposed Changes

Here are the original designs.

However, we discussed some changes with @bartoszbak

• Snap to the selected point - so the tooltip reflects the data point
• Sit the tooltip 16px above the point
• Show the points permanently - but with a highlighted state
• I've removed the grey line as it was causing an issue with the tooltip mouse position, but also no longer needed now the tooltip is fixed just above the point.

Testing Instructions

• Hit the campaign details page and hover over the charts, here is an example:

Screen.Recording.2024-12-06.at.11.55.22.mov

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
  • For UI changes, have we tested the change in various languages (for example, ES, PT, FR, or DE)? The length of text and words vary significantly between languages.
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

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https://calypso.live?image=registry.a8c.com/calypso/app:build-126791&env=jetpack

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[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~534 bytes added 📈 [gzipped])

name             parsed_size           gzip_size
promote-post-i2      +1569 B  (+0.2%)     +534 B  (+0.2%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• blaze-dashboard
• notifications
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug jamesgill23/chart-tooltips on your sandbox.

[therocket-gr]

Nice changes.. LGTM