Add exam date range filter to the courses refine sidebar

[Copilot]

Adds exam-date filtering to /courses via optional start and end datetime-local inputs in Refine by. When either bound is set, course search applies a range filter on semesterData.examDate.

• Sidebar filter UI

  • Adds a new DateTimeRangeFilter component for browser-native datetime range input.
  • Renders independent optional Start / End fields under a new Exam Date filter section.
  • Constrains the inputs with reciprocal min / max bounds to avoid inverted ranges.

• Search query integration

  • Introduces a custom Searchkit accessor that stores partial or complete exam-date bounds.
  • Builds a nested Elasticsearch range filter on semesterData.examDate whenever either bound is present.
  • Exposes the selected range through Searchkit selected filters and clears the filter once both bounds are empty.

• Courses page wiring

  • Integrates the new filter into ModuleFinderSidebar alongside the existing exam-related filters.

• Illustrative query shape

  {
    nested: {
      path: 'semesterData',
      query: {
        range: {
          'semesterData.examDate': {
            gte: '2026-04-25T09:00:00.000Z',
            lte: '2026-04-27T18:30:00.000Z',
          },
        },
      },
    },
  }

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
nusmods-export	Ignored		Apr 14, 2026 1:11pm
nusmods-website	Ignored		Apr 14, 2026 1:11pm