Implement the outline file popup window that opens when a user
right-clicks on a folder in the file list (e.g., Act 1 in 06-First Draft)
and selects 'Outline' from the context menu. The window displays the
corresponding outline file (e.g., 04-Outline/scene_breakdown/act_01.md)
in a read-only view.
Changes:
- Add outline_popup_window() function in file_list.rs
- Add window rendering call in mod.rs update loop
- Popup reads file content on open and displays it in scrollable view
Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>
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