- NodeShell component wraps all nodes with handle rendering + px-8 content padding
- Handles positioned at node edges with labels outside (no overlap with content)
- Labels: 9px mono font, full opacity, color-matched to socket type
- Removed old TypedHandle + NodeHandles (replaced by NodeShell internals)
- All 18 node components updated to use NodeShell
- Format node dynamically generates handles from template {0}, {1}, etc.
