## Context
Changes here aren't public facing - we're just shifting some internal
only fields on the new project page to consolidate them into the
"internal-only" collapsible
Mainly to improve clarity from our POV RE what fields do users see and
the general look of the new project form
<img width="727" height="558" alt="image"
src="https://github.com/user-attachments/assets/7d8f2915-3a81-4d9d-a067-cd45c1725726"
/>
So everything that's not within the collapsible are essentially fields
that users will see on prod. The changes here also subsequently
deprecates the use of 2 feature flags on the new project page:
- `showPostgresVersionSelector` -> replaced by new flag
`newProjectInternalOnlyConfiguration`
- `enableFlyCloudProvider` -> was used to control the visibility of the
cloud provider field, now replaced by
`newProjectInternalOnlyConfiguration`
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Reorganized project creation form layout and field ordering for
improved structure.
* Updated project resume flow with refined confirmation modal UI.
* Simplified cloud provider selection interface.
* Streamlined high-availability configuration presentation.
<!-- review_stack_entry_start -->
[](https://app.coderabbit.ai/change-stack/supabase/supabase/pull/45873)
<!-- review_stack_entry_end -->
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## Problem
We have multiple `Collapsible` components.
## Solution
Reduce their number by using only the one from shadcn.
I haven't noticed any visual nor functional changes.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Migrated expandable/collapsible UI to a unified shadcn-based
implementation for more consistent expand/collapse behavior across the
app.
* **Style**
* Updated listbox check icon sizing and removed obsolete collapsible
open/close animations.
* **Chores**
* Removed deprecated collapsible variants and consolidated UI component
surface for simpler maintenance.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## Summary
- Adds a "Custom instance type" input on the new-project modal, rendered
directly below the existing custom Postgres version field and gated
behind the same non-prod check.
- Wires the value through
`custom_supabase_internal_requests.ami.instance_type`, merged with the
existing AMI search-tag payload so both can be set independently.
<img width="312" height="133" alt="Screenshot 2026-05-07 at 12 32 41 PM"
src="https://github.com/user-attachments/assets/d4190a0f-0a54-46e6-ac0b-967548a3903f"
/>
## Test plan
- [x] On a non-prod build, open the new-project modal and confirm the
"Custom instance type" field appears below "Custom Postgres version".
- [ ] Submit with only an instance type set and verify the request body
includes `custom_supabase_internal_requests.instance_type` and no `ami`
block.
- [x] Submit with both fields set and verify both `ami.search_tags` and
`instance_type` are sent.
- [x] Submit with neither set and verify
`custom_supabase_internal_requests` is omitted.
- [x] Verify the field is hidden in prod builds.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added instance type field to project-creation wizard.
* Added an internal-only configuration panel for advanced customization.
* **Refactor**
* Simplified Advanced Configuration panel layout and behavior.
* **Documentation**
* Updated documentation links to use internal reference URLs.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Joshen Lim <joshenlimek@gmail.com>
