feat(view): Obsidian-style graph hover highlight and labels

[kzu]

Summary

• Local graph hover highlights the node and its neighbors after a short delay (anti-flicker), while dimming the rest
• Labels sit under spheres with clearer typography; hovered label size/nudge animates via CSS
• Links stay hairline thin (no thickness growth); camera aspect fixes reduce egg-shaped nodes

Test plan

• Run okf view on a bundle and open the local graph
• Confirm labels sit below nodes, not on top of them
• Hover a node briefly then hold — highlight should lag ~200ms, then purple links + dim rest
• Confirm links stay thin on hover (no thick cylinders)
• Confirm hovered label grows and drops slightly with a smooth CSS transition
• Expand the graph and re-check labels, spheres, and hover behavior

[kzu]

🧪 Details on Ubuntu 24.04.4 LTS

from retest v1.1.0 on .NET 10.0.9 with 💜 by @devlooped