Fix overflow in planner module list

[jloh02]

Context

Fix #3698 with additional fixes to ensure header remains in size

Implementation

• CSS fixes for overflows including scrollable and no-wrap
• Set minimum width for trash button
• useMediaQuery to allow settings button to reduce to an icon button
• Minor fix to capitalize the word "Course"/"Courses" to match the capitalization of "Unit"

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
nusmods-export	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 1, 2024 5:41am
nusmods-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 1, 2024 5:41am

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 53.58%. Comparing base (7334b07) to head (45b297a).

Files	Patch %	Lines
...ebsite/src/views/planner/PlannerSettingsButton.tsx	0.00%	4 Missing :warning:
...iews/planner/PlannerContainer/PlannerContainer.tsx	0.00%	2 Missing :warning:
website/src/views/planner/PlannerSemester.tsx	0.00%	1 Missing :warning:
website/src/views/planner/PlannerYear.tsx	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3701 +/- ## ========================================== - Coverage 53.62% 53.58% -0.04% ========================================== Files 272 273 +1 Lines 5979 5983 +4 Branches 1428 1429 +1 ========================================== Hits 3206 3206 - Misses 2773 2777 +4 ```

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