[Header Logging] Adds three Statsig Events to Header

[hannahbergam]

Adds three analytics events to track user interactions with the header.

Events added

Header Lesson Name Clicked
Fires when a user clicks the lesson name link in the header.
Payload: lessonName

Header Progress Bubble Link Clicked
Fires when a user clicks a progress bubble to navigate to a level.
Payload: previousLevelNumber, newLevelNumber, lessonName

Header Unit Details Toggled
Fires when a user opens or closes the unit details popup (the "More"/"Less"
toggle button).
Payload: open (boolean)

Side quests

• Connected ProgressBubble to Redux to read the current level number via the getCurrentLevel selector, needed for the previousLevelNumber payload. Added a named export class ProgressBubble alongside the connected default export so existing enzyme tests could continue using the unconnected class directly.
• Updated ProgressBubbleTest.js to import the unconnected {ProgressBubble} class, and updated SublevelCardTest.js to wrap renders in a Redux Provider with the progress reducer registered.
• Fixed a pre-existing TypeScript error in BubbleChoice.tsx that was surfaced by the Redux connect wrapper: _.mapKeys returns Dictionary<V> which TypeScript can't verify satisfies the level prop type, fixed with an as unknown as LevelWithProgress cast.

Links

• Jira: https://codedotorg.atlassian.net/browse/AFL-520

Testing story

Deployment notes

Privacy and security