Nodes grew into rectangles because NodeResizer had no aspect ratio
constraint, minWidth != minHeight, and icon/text only scaled from width.
- DeviceNode: add keepAspectRatio + equal minWidth/minHeight (80×80),
maxWidth/maxHeight (280×280), scale icon and label/IP font sizes from
Math.min(width, height) so all content grows uniformly
- DiagramEditor: set explicit 120×120 style on dropped device nodes so
React Flow has a definite starting size for aspect ratio calculation
- DiagramEditor: persist device node style (width/height) in
serializeNodes and restore it on load so size survives save/reload
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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