[Feature] Asset Library - Centralized Media Management for Projects

[vzeman]

Summary

Build a project-level asset library for managing all media files associated with a project. A well-organized asset library prevents duplicate files, makes it easy to reuse images and audio across scenes, and tracks the provenance of all generated content.

Requirements

• Asset types: images (PNG, JPEG, WebP), videos (MP4, MOV), audio (MP3, WAV, AAC), generated outputs
• Grid and list view with search and filter
• Asset metadata: filename, dimensions, duration, file size, creation date, source (uploaded/generated), model used
• Drag assets directly into scene editor from library
• Bulk import from folder
• Duplicate detection: warn if same file added twice
• Asset preview on hover
• Right-click context menu: use as first frame, use as last frame, use as reference, delete
• Tag assets for easy retrieval
• Sort by: date, name, size, type
• Storage usage indicator
• Export all assets as zip
• Link/embed toggle: store asset inside project file or link to external path

Acceptance Criteria

• All asset types display correctly in grid and list views
• Assets can be dragged from library into scene editor
• Duplicate detection warns before adding an existing file
• Tags and search work together to filter assets
• Storage usage indicator is accurate and updates in real-time

Related

Part of the ai-video-editor Flutter application. Used by #64 (First & Last Frame Control), #65 (Video Generation), and #66 (Text-to-Image Generation).