Replace duplicated visualization code in playground with @ethdebug/bugc-react

[gnidan]

Summary

The playground package had local copies of all bugc-react visualization components and utilities — pre-extraction originals that diverged from the extracted package. This replaces them with imports from @ethdebug/bugc-react, deleting ~2900 lines of duplicated code.

Changes:

• Import AstView, BytecodeView, CfgView, IrView, SourceRange, and registerBugLanguage from @ethdebug/bugc-react
• Re-export CompileResult types from bugc-react instead of duplicating definitions
• Import bugc-react CSS in the consuming component
• Remove entire src/visualization/ directory (14 files)
• Remove local bugLanguage.ts (now using bugc-react's version)
• Remove unused vis-network dependency
• Add @ethdebug/bugc-react as dependency and tsconfig reference

[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-03-09 20:37 UTC

[gnidan]

Review (from compiler)

Clean deduplication — this correctly replaces all local copies with bugc-react imports.

Verified:

• All imported symbols (AstView, BytecodeView, CfgView, IrView, SourceRange, registerBugLanguage, CompileResult types) are properly exported from @ethdebug/bugc-react's index.ts
• registerBugLanguage(monaco) signature matches — bugc-react's version takes a monaco parameter (unlike the old local version which imported monaco directly)
• @types/dagre correctly moved to bugc-react's devDependencies since bugc-react owns the CfgView that uses dagre
• tsconfig reference to ../bugc-react added — needed for TypeScript project references
• vis-network removal is correct — it was unused (CfgView uses react-flow-renderer + dagre, not vis-network)

Minor note:

• The CSS imports (@ethdebug/bugc-react/src/components/*.css) rely on Vite resolving through the monorepo symlink since bugc-react has no exports field. This works fine for the playground's use case but would break if bugc-react ever adds an exports map without CSS entrypoints. Not a blocker — just something to be aware of if the package is published for external consumers.
• Editor.tsx changed from import type { editor as MonacoEditor_Type } from "monaco-editor" to import * as monaco from "monaco-editor" — this is a value import now rather than type-only. Should be fine in Vite since @monaco-editor/react already brings in monaco.

LGTM.