Project import UI

[khvn26]

Scope

• New component: ProjectImport.tsx in web/components/import-export/.
• New RTK Query service: useProjectImport.ts in common/services/.
  • createProjectImport mutation.
  • getProjectImports query.
• New request/response types.
• Integrate into the existing Import tab on project settings page.
  • Add a toggle or sub-tab: "Environment Import" (existing) / "Project Import" (new).
• UI elements:
  • JSON file upload (reuse JSONUpload component).
  • Merge strategy radio buttons (Skip / Overwrite Destructive).
  • Warning message for Overwrite Destructive (reuse pattern from FeatureImport.tsx).
  • "Import Project" button.
  • Import status list with polling.

Acceptance criteria

• User can upload a project export file and select a merge strategy.
• Warning shown for Overwrite Destructive.
• Import list shows status with polling.