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Ali Waseem 5d3b84945e fix(studio): derive switch-to-preview refs from the branch (FE-4219) (#49320)
"Switch to preview" in the delete flow read its refs from the selected
project, so on the branching overview `parent_project_ref` was undefined
and the handler bailed with a `console.error` — persistent branches
couldn't be deleted.

Both refs now come from the `branch` prop, and the not-ready state shows
on the confirm button instead of the console. Covered by a new MSW test
that fails against the old code.

Fixes FE-4219

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

* **Bug Fixes**
* Improved switching branches to Preview mode by using the selected
branch’s project information.
  * Prevented confirmation when no branch is available.
* Preserved success notifications and modal closing after a successful
switch.

* **Tests**
* Added coverage for successful updates, API failures, error feedback,
request details, and disabled confirmation states.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->
2026-08-20 14:55:38 -04:00
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