supabase / supabase / 26276953651

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feat(ui-patterns): add CollapsibleCardSection component (#46250)

## What kind of change does this PR introduce?

New shared component + docs.

## What is the current behavior?

`AdvancedConfiguration` and `InternalOnlyConfiguration` in the New
Project form each contain bespoke `<Collapsible>` markup. There's no
reusable collapsible section component available to other card/panel
forms.

## What is the new behavior?

- Extracts a shared `CollapsibleCardSection` into
`packages/ui-patterns`, exported via
`ui-patterns/CollapsibleCardSection`
- Refactors `AdvancedConfiguration` and `InternalOnlyConfiguration` to
use it
- Adds design system docs with a live demo at
`/docs/fragments/collapsible-card-section`

This is a prereq for #45707 and #46187, which both consume this
component.

| Example Usage |
| --- |
| <img width="1464" height="500" alt="CleanShot 2026-05-22 at 15 20
38@2x"
src="https://github.com/user-attachments/assets/5b88ef8d-3f9a-4454-b246-5bbaf53e027a"
/> |

## To test

- [ ] Check that [the Design System
page](https://design-system-git-dnywh-collapsible-card-section-supabase.vercel.app/design-system/docs/fragments/collapsible-card-section)
makes sense
- [ ] Check that the [new project
form](https://studio-staging-git-dnywh-collapsible-card-section-supabase.vercel.app/dashboard/new/)
collapsible sections work as expected

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

## Release Notes

* **New Features**
* Introduced CollapsibleCardSection component as a reusable UI pattern
for collapsible card-based content with customizable title, description,
and open state.
* Refactored project configuration interfaces to use the new component
for improved visual consistency.

* **Documentation**
* Added comprehensive documentation with interactive examples and
multiple usage patterns for CollapsibleCardSection.

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