PR

[SheyeJDev]

feat: virtualization, real-time notifications, analytics, and test fixtures

Closes #<issue_no>

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Summary

This PR implements four improvements across the frontend codebase, addressing performance, real-time UX, analytics consistency, and test maintainability.

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Changes

1 · List Virtualization (performance)

Replaces fully-rendered lists with windowed rendering via react-window + react-virtualized-auto-sizer. Scroll performance is now constant regardless of list length.

File	What changed
src/components/courses/VirtualizedCourseList.tsx	New – fixed-height virtualized course list
src/components/search/VirtualizedSearchResults.tsx	New – variable-height search results with type-aware row sizing
src/components/messaging/VirtualizedMessageThread.tsx	New – variable-height message thread, auto-scrolls to newest message

Replace inline test objects:

// Before
const courses = [{ id: "1", title: "TS", instructor: "Alice", … }];
// After

import { makeCourses } from "@/testing/utils/fixtures";

const courses = makeCourses(5);

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Testing

• Scroll through 10 000-item course/search/message list — no jank
• Open notification panel — badge updates in real time via WebSocket
• Disconnect network — panel reconnects automatically on restore
• All existing tests pass with updated fixture imports
• analytics.track(…) appears in console (dev) / POST to /api/events (prod)

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⭐ Please star the repo before submitting your PR.

Closes #202
Closes #204
Closes #208
Closes #198

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