feat: implement grading permissions and authorization hooks

[bra-i-am]

Description

This PR implements AuthZ permission checks for the Settings → Grading page in Studio, enabling role-based UI control based on the courses.view_grading_settings and courses.edit_grading_settings permissions from openedx-authz.

What changed

New shared authz utilities

• src/authz/hooks.ts — New useUserPermissionsWithAuthzCourse(courseId, permissions) hook that abstracts the common pattern of checking the enableAuthzCourseAuthoring waffle flag, fetching permissions when enabled, and defaulting all permissions to true when disabled.
• src/authz/permissionHelpers.ts — New getGradingPermissions(courseId) and getFilesPermissions(courseId) helpers that return structured permission query objects.
• src/authz/constants.ts — Added VIEW_GRADING_SETTINGS and EDIT_GRADING_SETTINGS to COURSE_PERMISSIONS.

Grading Settings page (GradingSettings.jsx):

• If the user lacks courses.view_grading_settings → renders <PermissionDeniedAlert /> (full page block).
• If the user lacks courses.edit_grading_settings → all edit controls are disabled (read-only view).
• isEditable prop propagated to all child components: GradingScale, GradingScaleSegment, GradingScaleHandle, AssignmentSection, AssignmentItem, AssignmentTypeName, DeadlineSection, CreditSection.

Supporting information

• Backend authz permission definitions: openedx_authz.constants.permissions.COURSES_VIEW_GRADING_SETTINGS / COURSES_EDIT_GRADING_SETTINGS
• Waffle flag: authz.enable_course_authoring (CourseWaffleFlag, default false)

Testing instructions

Prerequisites:

1. Enable the waffle flag: Django Admin → Waffle → Flags → create authz.enable_course_authoring set to Everyone.
2. Create a test course.

Test view permission denied:

1. Create a user with no role assigned to the course.
2. Navigate to Settings → Grading for that course.
3. Expected: Permission denied alert is shown.

Test view-only (read-only UI):

1. Assign course_auditor role to a user for the course via PUT /api/authz/v1/roles/users/ with scope=course-v1:Org%2BCourse%2BRun.
2. Log in as that user and navigate to Settings → Grading.
3. Expected: Page loads, but all inputs are disabled and the Save button is disabled.

Test full edit access:

1. Assign course_editor role to a user.
2. Navigate to Settings → Grading.
3. Expected: Full edit access — all inputs enabled, Save button works.

Other information

• This PR depends on openedx/openedx-platform#38213, which introduces the authz-aware permission check pattern in the backend endpoints this page consumes of course_settings (GET /api/contentstore/v1/course_settings/*). That PR must be merged before this frontend change.
• The useUserPermissionsWithAuthzCourse hook introduced here should be reused for future authz integrations across other Settings pages, following the pattern established in PR Adding permission validations from authz for files page #2941.
• This PR resolves Task - RBAC Authz - Implement frontend check for Settings -> Grading permissions #2936

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

• Any new files are using TypeScript (.ts, .tsx).
• Avoid propTypes and defaultProps in any new or modified code — existing JSX child components were modified and retain their existing patterns. Full migration to TypeScript is out of scope for this PR.
• Tests should use the helpers in src/testUtils.tsx (specifically initializeMocks) — to be added in a follow-up.
• Do not add new fields to the Redux state/store. Use React Context to share state among multiple components.
• Use React Query to load data from REST APIs. See any apiHooks.ts in this repo for examples.
• All new i18n messages in messages.ts files have a description for translators to use.
• Avoid using ../ in import paths. To import from parent folders, use @src.

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[codecov]

Codecov Report

❌ Patch coverage is 97.22222% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.57%. Comparing base (2930265) to head (ad49a12).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...s/grading-scale/components/GradingScaleSegment.tsx	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #2988    +/-   ##
========================================
  Coverage   95.57%   95.57%            
========================================
  Files        1366     1368     +2     
  Lines       31507    31541    +34     
  Branches     7119     6903   -216     
========================================
+ Hits        30113    30146    +33     
- Misses       1344     1345     +1     
  Partials       50       50            

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