[OPIK-4721] Use playground permission

[anastasiapyzhik]

Details

Add playground_use permission to the frontend and hide the Playground entirely when the user lacks this permission.

Permission infrastructure:

• Add PLAYGROUND_USE to ManagementPermissionsNames enum
• Add canUsePlayground to the Permissions interface, defaults, hook, and provider

Route guards (v1 & v2):

• Create PlaygroundPageGuard component using NoAccessPageGuard with custom message: "You don't have permissions to use playground in this workspace."
• Wire guard into both routers with child index route pattern

Sidebar navigation (v1 & v2):

• Conditionally include the "Playground" menu item based on canUsePlayground

Prompts page (v1 & v2):

• Hide "Try in the Playground" and "Improve prompt" buttons in PromptTab when user lacks permission

Evaluation suites (v1 & v2):

• Hide "Open in Playground" dropdown menu item in UseEvaluationSuiteDropdown
• Hide the entire dropdown trigger when neither canUsePlayground nor canCreateExperiments is available (prevents empty dropdown)

Trace details (v1 & v2):

• Hide "Use in Playground" button in PromptsTab when user lacks permission

Change checklist

• Permission enum added to ManagementPermissionsNames
• canUsePlayground wired through useUserPermission → PermissionsProvider → Permissions interface
• PlaygroundPageGuard created for both v1 and v2
• Sidebar playground item conditionally rendered
• All playground entry-point buttons guarded
• Empty dropdown edge case handled in UseEvaluationSuiteDropdown
• Both v1 and v2 updated consistently

Testing

1. With permission: Verify all playground flows work as before (sidebar visible, route accessible, all buttons present)
2. Without permission:
   • Sidebar: "Playground" item should be hidden
   • Direct URL navigation: Should show 403 page with "You don't have permissions to use playground in this workspace."
   • Prompt library: "Try in the Playground" and "Improve prompt" buttons should be hidden
   • Evaluation suites: "Open in Playground" dropdown item should be hidden; entire dropdown hidden if experiment creation is also denied
   • Trace details: "Use in Playground" button should be hidden
3. OSS/self-hosted: Default true — no behavior change
4. Admin users: Playground always accessible

Issues

OPIK-4721

Documentation

N/A