WIP: sync workspace before rebase

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FIXED: Double /api issue by using environment variable properly

Force rebuild with API URL fix - add comment to ensure changes are picked up

Hardcode API URL to fix production build issue

Add detailed API debugging to troubleshoot URL issues

Fix authentication setup - add AuthProvider and auto-visitor authentication

Update Week 2 video subtitling with definitive cross-platform timecodes - All 26 segments updated with precise millisecond accuracy for Mac/Windows compatibility

Update src/pages/TutorialTasks.tsx with working version

Resolve merge conflict in WeeklyPractice.tsx

Restore image upload functionality for Week 2 tutorial tasks

Update frontend to use public weekly practice endpoint

Revert to using authenticated API call

Fix weekly practice API call to work without authentication

Fix weekly practice API endpoint to use correct backend route

Fix segment persistence and restore Week 1 content fetching

Fix loading state issue in WeeklyPractice page

Fix merge conflict in root package.json and resolve JSX type errors

Add missing toggleExpanded function for practice section expansion

Add missing handleTargetTextChange function for translation input

Add missing startEditingTimecodes function for admin timecode editing

Add missing videoInfo variable to fix build error

Fix missing functions: add weeks variable, handlePreviewTranslation, getSegmentButtonClass, and formatTime functions

Fix build error: add missing fetchWeeklyPractice function

Fix build error: add missing fetchUserSubmissions function

Fix build error: add missing saveTimecodesToDatabase function

Fix build error: add missing handleSegmentClick function

Fix Week 2: use localStorage for persistence, remove non-existent API calls

Fix Week 2 issues: hide timecodes from students, fix translation persistence, prevent translation loss

Fix Week 2: add translation persistence, hide timecode editing from students

Fix ESLint error: replace confirm with window.confirm

Add complete MongoDB storage for subtitles, translations, and source texts

Add MongoDB storage for timecodes and robust video playback handling for time clashes

Add persistence, time clash detection, and reset functionality for timecode editing

Make subtitleSegments editable state and ensure timecode changes affect video playback

Add timecode editing for admin users and debugging for timing verification

Implement segment-specific playback: video plays only selected segment then pauses

Fix subtitle issues: lower position, prevent lingering, unmute video

Implement professional subtitle overlay: dynamic sizing, precise timing, positioned above controls

Improve subtitle overlay: position above controls, reduce opacity, narrower shade

Update video source to use local video file for reliable playback

Implement HTML5 video with direct file access for precise seeking and subtitle sync

Fix TypeScript compilation error by moving subtitleSegments declaration before use

Implement working YouTube iframe API with real-time video seeking and subtitle sync

Restore original segment selection and preview mode behaviors

Fix TypeScript compilation error with Set spread operator

Implement simple, reliable YouTube embed - no complex APIs

Implement simple YouTube embed with URL parameters for reliable video playback

Restore YouTube iframe with correct Nike video and improved subtitle sync