✏️ Edit Mode Test - Complete Dashboard System

Features:
• Click "Edit Layout" to enter edit mode
• In edit mode: drag widgets, resize from corners/edges, delete widgets, add from library
• Click widgets in the library (left side) to add them
• Hover over widgets to see edit controls (settings ⚙ and delete ×)
• Click "Save" to commit changes or "Cancel" to discard
• Press Escape while dragging/resizing to cancel