feat(inspector): compact graph layout via Graphviz dot node allocation

[antfubot]

Description

Adapts the graph node allocation from npmgraph to render a more compact dependency graph.

Like npmgraph, the node positions are now allocated by Graphviz dot (via @hpcc-js/wasm-graphviz), while keeping the existing interactive Vue renderer — the DOT document only carries node sizes and edges, and only the computed positions (json output) are read back:

• Full-DAG-aware layering — columns are computed from every dependency edge, not just the rendered spanning tree, so shared dependencies are placed after all of their dependents.
• Shrink-wrapped nodes — the fixed 300px min-width is gone; rendered node sizes are measured from the DOM and passed to Graphviz (npmgraph's width=0 height=0 trick), so each column is only as wide as its content. Link endpoints use per-node widths.
• Runs in a Web Worker — dot can take a few seconds on large graphs (~1s at 800 nodes, ~4s at 1500 in benchmarks), so the WASM engine runs off the main thread. The previous tidy-tree layout is kept as an instant provisional pass (and as the fallback if the layout fails), then positions refine in place when dot finishes. splines=none skips edge routing since only positions are consumed.
• The ~2MB WASM payload is lazy-loaded inside the worker, only when the graph page is opened.

Verification

• pnpm test (88 passed), pnpm typecheck, pnpm lint
• Manually verified in the browser: normal + dots render modes, node selection/active links, focus scrolling, mode toggling
• E2E dev specs weren't run here: the sandbox hits a pre-existing @nuxt/devtools alpha incompatibility at dev-server startup, unrelated to this change

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This PR was created with the help of an agent.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/node-modules-inspector@194

npm i https://pkg.pr.new/node-modules-tools@194

commit: c3a88ab