improvement(emcn): extract design system into shared @sim/emcn package

[waleedlatif1]

Summary

• Extracted the emcn design system (177 files) into a shared @sim/emcn package, consumed directly by both apps/sim and apps/docs — one source of truth, no duplication.
• Moved cn, keyboard, and use-copy-to-clipboard into the package. Rewrote all apps/sim imports to direct @sim/emcn (icons via @sim/emcn/icons, CSS modules via file path); removed the @/components/emcn alias and the old re-export shims.
• apps/docs now consumes @sim/emcn directly — deleted its hand-rolled chip / chip-dropdown / dropdown-menu mirrors and bridged the few missing CSS tokens.
• Made ChipModal email validation prop-driven: the design system keeps only a generic syntax gate; app-specific disposable-domain policy (quickValidateEmail) stays in apps/sim and is injected via the field's validate prop (3 invite call sites), preserving behavior.
• Barrel resolves the Calendar / Table component-vs-icon name collisions explicitly (the icon stays available from @sim/emcn/icons). Updated the import conventions in CLAUDE.md and the rules.

Type of Change

• Improvement / refactor

Testing

• apps/sim typecheck: 0 errors
• apps/docs typecheck: 0 errors
• @sim/emcn typecheck: 0 errors, 10 tests pass
• Monorepo + realtime boundary checks pass
• check:api-validation passes
• biome clean

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[greptile-apps]

Too many files changed for review. (692 files found, 500 file limit)

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Jun 29, 2026 4:52am

[cursor]

PR Summary

Medium Risk
Very wide import-path churn across the main app and docs raises regression risk for UI bundling and styling, though behavior is intended to stay the same aside from prop-driven ChipModal email validation.

Overview
Extracts the EMCN design system into a workspace @sim/emcn package and rewires apps/sim and apps/docs to import components, cn, handleKeyboardActivation, and useCopyToClipboard from that barrel (icons from @sim/emcn/icons, CSS from package paths) instead of @/components/emcn or local @/lib helpers.

apps/docs drops its duplicated chip/dropdown implementations, adds the @sim/emcn dependency with transpilePackages, and extends global.css tokens so shared chrome renders correctly.

Contributor rules (CLAUDE.md, .claude/.cursor rules) now document @sim/emcn as the canonical import path. Tests and mocks are updated to target @sim/emcn.

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[waleedlatif1]

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[waleedlatif1]

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[waleedlatif1]

@greptile

[waleedlatif1]

@greptile