Implement a 3-column layout with a collapsible sidebar for organizing
and managing HTTP requests within projects. Requests are stored in
~/.roster/requests.json for easy git versioning.
Features:
- Create, rename, and delete projects
- Save current request to a project with custom name
- Load saved requests with direct click (no confirmation dialog)
- Delete saved requests with confirmation
- Expandable/collapsible project folders
- Context menu for project actions
Technical changes:
- Add SavedRequest and Project data models with JSON serialization
- Implement ProjectManager for persistence to ~/.roster/requests.json
- Create RequestItem and ProjectItem widgets with GTK templates
- Restructure main window UI to nested GtkPaned (3-column layout)
- Add project management dialogs using AdwAlertDialog
- Update build system with new source files and UI resources
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