feat(surveys): ff cross-sell with mini survey builder

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Problem

not many people click the create survey​ button from the feature flag sub-menus, and even fewer follow through to create a survey

i think this is because 1) the button is pretty hidden, and 2) the create-survey-with-AI workflow, as it exists today, is not very good

this PR introduces a new lightweight survey creation modal, embedded as "user feedback" within feature flags

Changes

survey-ff-cross-sell-demo2.mp4 (uploaded via Graphite)

1. new "quick create" survey modal. currently tailored towards feature flags (shows variants when available), but will be used for other products later
2. added a new "user feedback" section to feature flags that:
   1. if no survey exists w/ this flag: shows the quick create
   2. if 1 survey exists w/ this flag: shows the survey results
   3. if >1 surveys exist w/ thsi flag: shows table of surveys

next steps:

1. make this a bit more useful with auto-summarization
2. bring it out to the actual ff detail page for better viz
3. use for other products like experiments

How did you test this code?

👉 Stay up-to-date with PostHog coding conventions for a smoother review.

Changelog: (features only) Is this feature complete?

[adboio]

• feat(surveys): enhance ff cross-sell #41941
• feat(surveys): ff cross-sell with mini survey builder #41873 👈 (View in Graphite)
• feat(surveys): add cross-sell button to funnel insights #41703 : 1 other dependent PR (#41694 )
• feat(surveys): add FK for linked_insight_id #41708
• feat(surveys): add linked_insight_id field #41689
• master

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[github-actions]

Size Change: +68 B (0%)

Total Size: 3.4 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	3.4 MB	+68 B (0%)

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[posthog-bot]

Visual regression: Storybook UI snapshots updated

Mode: UPDATE (triggered by human commit cc81a14)

Changes: 2 snapshots (2 modified, 0 added, 0 deleted)

What this means:

• Snapshots have been automatically updated to match current rendering
• Next CI run will switch to CHECK mode to verify stability
• If snapshots change again, CHECK mode will fail (indicates flapping)

Next steps:

• Review the changes to ensure they're intentional
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• If unexpected, investigate component rendering

Review snapshot changes →

[posthog-bot]

Visual regression: Storybook UI snapshots updated

Mode: UPDATE (triggered by human commit 4273289)

Changes: 2 snapshots (2 modified, 0 added, 0 deleted)

What this means:

• Snapshots have been automatically updated to match current rendering
• Next CI run will switch to CHECK mode to verify stability
• If snapshots change again, CHECK mode will fail (indicates flapping)

Next steps:

• Review the changes to ensure they're intentional
• Approve if changes match your expectations
• If unexpected, investigate component rendering

Review snapshot changes →

[greptile-apps]

_{11 files reviewed, 1 comment}

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[adboio]

sorry for the monster, ~500 lines are just tests i promise