Add dependency graph visualizer and editor

[VEZY]

Summary

• Add a Julia dependency graph view IR with JSON and standalone HTML export.
• Expose model nodes, ports, edge metadata, cycle diagnostics, and a first PreviousTimeStep edit.
• Scaffold a React Flow + ELK frontend for the interactive graph viewer/editor.
• Cover the new graph view and edit path with unit tests.

Testing

• Added and ran unit tests for the dependency graph view, multiscale edges, HTML export, and the first edit-back operation.
• Ran the full Julia test suite successfully.
• Built and typechecked the frontend successfully with Vite and TypeScript.

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	3cd60b5...	main / 3cd60b5...
bench_linux/PBP	16.5 ± 2.5 ms	18 ± 2.6 ms	0.916 ± 0.19
bench_linux/PBP_multiple_timesteps_MT	0.257 ± 0.061 s	0.27 ± 0.061 s	0.952 ± 0.31
bench_linux/PBP_multiple_timesteps_ST	0.238 ± 0.018 s	0.239 ± 0.018 s	0.994 ± 0.11
bench_linux/PSE	5.22 s	5.07 s	1.03
bench_linux/PSE_multirate_output_request_run	8.27 s	7.93 s	1.04
bench_linux/PSE_multirate_status_tracked_run	4.36 ± 0.25 s	4.28 ± 0.36 s	1.02 ± 0.1
bench_linux/XPalm_convert_outputs	0.891 ± 0.034 s	0.974 ± 0.049 s	0.915 ± 0.057
bench_linux/XPalm_run	12.5 s	11.7 s	1.07
bench_linux/XPalm_setup	0.952 ± 0.13 s	0.965 ± 0.14 s	0.987 ± 0.19
time_to_load	2.17 ± 0.0064 s	2.16 ± 0.007 s	1 ± 0.0044

Memory benchmarks

	main	3cd60b5...	main / 3cd60b5...
bench_linux/PBP	0.12 M allocs: 7.2 MB	0.131 M allocs: 8.11 MB	0.888
bench_linux/PBP_multiple_timesteps_MT	3.73 M allocs: 0.237 GB	3.73 M allocs: 0.237 GB	1
bench_linux/PBP_multiple_timesteps_ST	3.58 M allocs: 0.213 GB	3.58 M allocs: 0.213 GB	1
bench_linux/PSE	0.0499 G allocs: 3.7 GB	0.0498 G allocs: 3.69 GB	1
bench_linux/PSE_multirate_output_request_run	0.0851 G allocs: 3.5 GB	0.0851 G allocs: 3.5 GB	1
bench_linux/PSE_multirate_status_tracked_run	0.0607 G allocs: 1.93 GB	0.0607 G allocs: 1.93 GB	1
bench_linux/XPalm_convert_outputs	6.62 M allocs: 0.436 GB	6.62 M allocs: 0.436 GB	1
bench_linux/XPalm_run	0.105 G allocs: 6.72 GB	0.104 G allocs: 6.68 GB	1.01
bench_linux/XPalm_setup	0.305 M allocs: 16.3 MB	0.518 M allocs: 26.5 MB	0.617
time_to_load	0.149 k allocs: 11.1 kB	0.149 k allocs: 11.1 kB	1