feat: improvements for survey stats

[lucasheriques]

Problem

right now, we only show responses filtered by user distinct ids. since it's possible on some scenarios a survey is displayed twice, this doesn't track the total number of responses.

Also a chance to improve our loading screens, adding proper skeletons instead of just a random line, and also add the conversion rate for each user.

Changes

Before	After

• Displaying conversion rate
• Display total number of responses (not filtered by distinct users)
• UX improvements

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Does this work well for both Cloud and self-hosted?

yes

How did you test this code?

visual changes only

[greptile-apps]

PR Summary

This PR improves survey stats display and filtering by introducing a new stats component with enhanced loading skeletons, conversion rates, and refined user count logic.

• frontend/src/scenes/surveys/SurveyResponseFilters.tsx: Updated header tag for improved accessibility.
• frontend/src/scenes/surveys/SurveyStatsSummary.tsx: New component adds proper skeletons and conversion rate display.
• frontend/src/scenes/surveys/components/StackedBar.tsx: Implements dynamic response segmentation with tooltips.
• frontend/src/scenes/surveys/SurveyView.tsx: Integrates the new stats component.
• frontend/src/scenes/surveys/surveyLogic.tsx: Refines user stats to avoid duplicate counts and support conversion rates.

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[github-actions]

Size Change: +171 B (0%)

Total Size: 13.2 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	13.2 MB	+171 B (0%)

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[ioannisj]

Just a couple of minor comments from me.

[marandaneto]

@lucasheriques i find a bit odd the seen but no responses, does that mean the pop up is still open or what?
are there cases where the survey is shown but not dismissed/responded?

[lucasheriques]

@marandaneto yes there is a significant number of impressions but no action. it means the survey was displayed (and will be displayed again if the user comes back), but no action was taken

if you check our suver here, you'll see that 26% is unanswered (maybe I chan change back to this label instead)

[marandaneto]

@marandaneto yes there is a significant number of impressions but no action. it means the survey was displayed (and will be displayed again if the user comes back), but no action was taken

if you check our suver here, you'll see that 26% is unanswered (maybe I chan change back to this label instead)

Unanswered makes more sense then

[posthog-bot]

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[posthog-bot]

📸 UI snapshots have been updated

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• chromium: 0 added, 1 modified, 0 deleted (diff for shard 5)
• webkit: 0 added, 0 modified, 0 deleted

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[posthog-bot]

📸 UI snapshots have been updated

2 snapshot changes in total. 0 added, 2 modified, 0 deleted:

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

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