Fix text selection: stop pointerdown and touchstart events from bubbling to prevent canvas panning when selecting text in edit mode

Update TextNode to use high-performance custom resize handles and support double-click edit mode that blocks node dragging for text selection

fix: implement useUpdateNodeInternals across all node types to resolve connection offset issues on size change

Fix performance: Debounce node resizing updates and resolve drawing node spawning conflict

Complete Canvas Overhaul: Global SVG Brush mode, transparent native text, and local image uploads via drag-and-drop

Refactor canvas tools: Fixed drawing logic, improved text input, and added local image drag-and-drop support

Add drawing nodes, image nodes, and plain text nodes to the canvas