feat: Add Means to Retention Chart

[aspicer]

https://github.com/PostHog/posthog/issues/19543

[posthog-bot]

📸 UI snapshots have been updated

26 snapshot changes in total. 0 added, 26 modified, 0 deleted:

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• webkit: 0 added, 8 modified, 0 deleted (diff for shard 2)

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[github-actions[bot]]

Size Change: +108 B (0%)

Total Size: 1.05 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	1.05 MB	+108 B (0%)

_{compressed-size-action}

[aspicer]

the purple isn't bad!

[posthog-bot]

📸 UI snapshots have been updated

28 snapshot changes in total. 0 added, 28 modified, 0 deleted:

• chromium: 0 added, 20 modified, 0 deleted (diff for shard 1, diff for shard 2)
• webkit: 0 added, 8 modified, 0 deleted (diff for shard 2)

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[posthog-bot]

This PR hasn't seen activity in a week! Should it be merged, closed, or further worked on? If you want to keep it open, post a comment or remove the stale label – otherwise this will be closed in another week.

[aspicer]

Added a checkbox.

[posthog-bot]

📸 UI snapshots have been updated

28 snapshot changes in total. 0 added, 28 modified, 0 deleted:

• chromium: 0 added, 20 modified, 0 deleted (diff for shard 1, diff for shard 2)
• webkit: 0 added, 8 modified, 0 deleted (diff for shard 2)

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[posthog-bot]

📸 UI snapshots have been updated

28 snapshot changes in total. 0 added, 28 modified, 0 deleted:

• chromium: 0 added, 20 modified, 0 deleted (diff for shard 1, diff for shard 2)
• webkit: 0 added, 8 modified, 0 deleted (diff for shard 2)

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