fix: handle undefined assignmentTypeGradeSummary in progress tab

[artburkay]

Description

This PR fixes a runtime crash (white screen) occurring on the Progress tab in the Learning MFE.

The Issue:
After upgrading from Sumac to Ulmo, we observed that the useModel('progress', ...) hook occasionally returns undefined or incomplete data during the initial render phase. This causes TypeError crashes when the code attempts to access array methods (such as .some(), .length) or pass these variables to utility functions (like getLatestDueDateInFuture).

Specific errors observed in the console:

• TypeError: Cannot read properties of undefined (reading 'some') in CurrentGradeTooltip.jsx
• TypeError: Cannot read properties of undefined (reading 'length') in GradeSummary.jsx
• TypeError: Cannot read properties of undefined (reading 'forEach') (via utils) in CourseGradeFooter.jsx

The Fix:
I have applied defensive coding practices by assigning default empty arrays ([]) and objects ({}) to the destructured variables from useModel. This ensures that the components can render safely even if the API response is delayed or the model data is not yet fully populated.

Changes

• src/courseware/course/course-grade/CourseGradeFooter.jsx: Added default values for assignmentTypeGradeSummary, courseGrade, and gradeRange.
• src/courseware/course/course-grade/CurrentGradeTooltip.jsx: Added default values for assignmentTypeGradeSummary and courseGrade.
• src/courseware/course/grade-summary/GradeSummary.jsx: Added default value for assignmentTypeGradeSummary to prevent .length check failure.

Testing Instructions

1. Navigate to the Learning MFE for any course.
2. Click on the Progress tab.
3. Verify that the page loads successfully without a white screen crash.
4. Check the browser console to ensure no TypeError: Cannot read properties of undefined errors are logged related to grade summaries.

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[artburkay]

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