feat: add project management features including open/save functionality and recovery support

README.md

@@ -5,6 +5,8 @@ Image Studio is a Bun + React image editor prototype. It uses a command-driven a
 ## Features
 
 - Import images into an artboard
+- Save and open versioned project files with embedded, project-owned assets
+- Automatic local recovery snapshots after document changes
 - Export the active artboard as PNG
 - Layer selection and layer sheet
 - Select, transform, pan, brush, eraser, chroma key, and magic wand tools
@@ -71,6 +73,8 @@ bun start
 | `Space` | Hold to pan |
 | `L` | Toggle layers |
 | `Cmd/Ctrl` + `O` | Open image |
+| `Shift` + `Cmd/Ctrl` + `O` | Open project |
+| `Cmd/Ctrl` + `S` | Save project |
 | `Cmd/Ctrl` + `Z` | Undo |
 | `Shift` + `Cmd/Ctrl` + `Z` | Redo |
 | `Delete` / `Backspace` | Delete selection |