• Screen: SCR-CCM.24 — Course Asset Library Panel (type: panel, embedded as the "Asset Library" tab of SCR-CCM.02)
• Use case: UC-CCM.10 — Manage Course Assets

Manages all CourseDraftResources of this CourseDraft — shared across all branches of the same course (SS-CCM.05). Filter bar (type tabs + search) + asset list + inline upload area (File/Video/SCORM tabs; Quiz/Assignment tabs show a "Go to Builder" CTA instead) + Preview panel (drawer) for file assets. No "Back" button — closing the tab means switching to another SCR-CCM.02 tab. This panel does not link assets to lessons — that happens via the "Select from Library" tab in SCR-CCM.04 / SCR-CCM.21 / the content pickers opened from UC-CCM.01.

• Filter bar: type_filter "Filter by type" — enum (all/image/video/document/scorm/quiz/assignment), default all · search_query "Search asset name" — text, max 100
• Asset list: col_asset_title "Name" · col_type_badge "Type" · col_file_size "File size" (hidden for quiz/assignment rows) · col_added_at "Date added" · col_usage_count "Used in (lessons)" — computed from CourseDraftItem references · empty_state_message — visible when the filtered list is empty
• Upload area: upload_type_selector "File type to upload" — required, default from current type_filter · upload_file_input "Select file" — required, hidden for quiz/assignment · upload_asset_title "Asset name" — required, defaults from original filename · quiz_build_cta / assignment_build_cta — shown in place of the file inputs when Quiz/Assignment selected
• Preview panel (file assets only): preview_asset_title — editable in edit mode · preview_content — inline preview (image/video/document) · preview_scorm_metadata · preview_usage_count · preview_asset_description — editable in edit mode · replace_file_input — visible when replace_file_mode == true · replace_file_error — inline validation error

• filter_by_type "Filter by type" — always enabled
• add_asset "Add Asset" — always enabled; triggers UC-CCM.10-M-2
• save_upload "Save Asset" — enabled when upload complete + title filled; triggers UC-CCM.10-M-5
• delete_asset "Delete" — enabled only when col_usage_count == 0; triggers UC-CCM.10-A-2D-1
• select_asset_row "View / Edit" — file row opens Preview panel (AF 2A); quiz row → SCR-CCM.06 (AF 2B); assignment row → SCR-CCM.27 (AF 2C); triggers UC-CCM.10-M-2
• go_to_quiz_builder — CTA shown when Quiz tab selected in upload area; triggers UC-CCM.10-A-3A-1
• go_to_assignment_builder — CTA shown when Assignment tab selected; triggers UC-CCM.10-A-3B-1
• close_preview "Close" — closes Preview panel, discards unsaved edits; triggers UC-CCM.10-A-2A-2
• start_edit_details "Edit Details" — enables name/description editing; triggers UC-CCM.10-A-2A-2
• save_details "Save" — enabled when title non-empty; triggers UC-CCM.10-A-2A-3
• cancel_edit "Cancel" — discards edit_details changes; triggers UC-CCM.10-A-2A-2
• start_replace_file "Replace File" — hidden for quiz/assignment assets; triggers UC-CCM.10-A-2A-2

1. The asset pool is shared across all branches of this CourseDraft. [refs: SS-CCM.05]
2. col_usage_count is computed at load time from CourseDraftItem references; Delete is disabled when usage_count > 0, with a tooltip "Used in N lessons. Remove from lessons before deleting this asset." [refs: SS-CCM.07]
3. Uploads through this panel are not linked to any lesson — they appear immediately in the "Select from Library" tab of SCR-CCM.04 and SCR-CCM.21.
4. Default sort is date added descending; also supports sort by name (A–Z) and file size (largest first).
5. File size column is hidden for quiz/assignment rows (no physical file); those rows never open the Preview panel — quiz navigates to SCR-CCM.06, assignment to SCR-CCM.27.
6. Replace File is validated against the same format/size whitelist as a new upload and is constrained to the existing asset's type; failure shows an inline error and leaves the stored file unchanged (AF 4A pattern). [refs: SS-CCM.02]