chore(style-types): migrate to per-package dist/ build pipeline

[layershifter]

Summary

Phase 2 of the workspaces + project-references migration (stacks on top of #962). Picks the smallest leaf package and replaces the workspace-rooted @nx/js:tsc build with a per-package tsc + asset-copy pipeline.

• Build output: packages/style-types/dist/ (was dist/packages/style-types).
• New tools/copy-pkg-assets.mjs copies package.json (stripped of scripts + devDependencies), README.md, and LICENSE.md into the per-package dist/.
• package.json gets a published-style exports map: @griffel/source (no-op today, forward-compat with the customConditions in later phases), types pointing at src/index.ts so consumers can resolve types without first building, default at dist/index.js for runtime, and a files: ["dist/", README, LICENSE, CHANGELOG] field.
• Drop @griffel/style-types from tsconfig.base.json paths — consumers resolve via the yarn workspace symlink + the package.json above.
• .gitignore: drop the leading slash from dist so per-package dist/ directories are also ignored.

Test plan

• yarn nx run-many --target=type-check --all — 20/20 pass
• yarn nx run-many --target=build --all — 15/15 pass
• yarn nx run-many --target=test --all — 16/16 pass (excluding the pre-existing e2e/rspack flake)
• yarn check-dependencies — clean

Stack

This PR builds on #962 — the diff above #962 is the style-types-only delta. Don't merge until #962 lands.

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[github-actions]

📊 Bundle size report

✅ No changes found

[layershifter]

Code review

Found 1 issue:

1. Published tarball will ship a broken types resolution. The outer packages/style-types/package.json declares "types": "./src/index.ts" (and the @griffel/source / types export conditions also point at ./src/index.ts), but files only includes dist/, README.md, LICENSE.md, CHANGELOG.md. Beachball publishes from the package root using the outer package.json, so the tarball will not contain any src/. Verified locally with npm pack --dry-run: the tarball contains dist/index.d.ts but no src/, while the included package.json still points types at ./src/index.ts. Every downstream consumer will get "cannot find type definitions" once this ships.

griffel/packages/style-types/package.json

Lines 10 to 27 in 4314a61

	"sideEffects": false,
	"main": "./dist/index.js",
	"types": "./src/index.ts",
	"exports": {
	".": {
	"@griffel/source": "./src/index.ts",
	"types": "./src/index.ts",
	"default": "./dist/index.js"
	},
	"./package.json": "./package.json"
	},
	"files": [
	"dist/",
	"README.md",
	"LICENSE.md",
	"CHANGELOG.md"
	],
	"dependencies": {

Fix options: point types and the types / non-source export conditions at the emitted ./dist/index.d.ts (declarations are already produced by tsconfig.lib.json), or add src/ to files if the goal is to keep ship-the-source semantics for @griffel/source consumers. The dist/package.json written by tools/copy-pkg-assets.mjs is also not used at publish time (npm reads the outer one), so fixing the outer file is what matters.

Other things considered but not flagged: the dead dist/package.json (harmless because beachball doesn't publish from dist/), the @griffel/update-shorthands path-mapping removal (no callers found), the .gitignore /dist → dist change (no tracked dist/* files), and the cwd vs documented usage of copy-pkg-assets.mjs (functionally works since the script resolves against repoRoot).

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[layershifter]

Slicing the migration into phases doesn't pan out — closing in favor of the single migration in #774.