feat: course-linked discussions — per-lesson comment panels

[clbotdev]

Summary

Enables per-lesson discussions by linking Communities to Courses. Students can comment on each lesson directly from the lesson player — no more switching between lesson content and a separate discussion board.

How it works

1. Course creator toggles Discussions ON from the course Manage screen
2. A Community is auto-created in the background, linked to the course
3. Each lesson automatically gets a CommunityPost for its discussion
4. Students see a desktop sidebar or mobile slide-in panel with threaded comments
5. Notifications deep-link directly to the lesson URL

Changes (22 files, +1,329 lines)

Data Model:

• Course.discussions (boolean) + Course.discussionCommunityId (string)
• Community.courseId — links community back to course
• CommunityPost.lessonId — links post to a lesson
• 4 new COURSE_DISCUSSION_* notification entity actions

Backend:

• Auto-create Community + CommunityPosts when discussions enabled
• Sync post titles on lesson rename, soft-delete on lesson removal
• Filter course-linked communities from main community listing
• Route all comment/like/reply notifications to course-specific types
• Deep-link notifications to course/{slug}/{courseId}/{lessonId}
• Auto-enroll students into discussion community on enrollment

Frontend:

• Course Manage: Discussions toggle (Switch component)
• Lesson page: Desktop sidebar (340px) + mobile FAB with slide-in drawer
• LessonDiscussionPanel: threaded comments, replies, likes via existing APIs

Design

See PRD: docs/prd-course-discussions.md

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Project	Deployment	Actions	Updated (UTC)
courselit-docs	Ready	Preview, Comment	May 30, 2026 3:48am