fix(core): publish a built @getworkbench/core/ui entrypoint

[omarzeineddine-ai]

Problem

Closes #32

The ./ui and ./ui/styles.css exports point at ./src/ui/... files, but only dist is in the package's files list — so the README-documented import { Dashboard } from "@getworkbench/core/ui" can never resolve from the npm tarball:

Cannot find module .../node_modules/@getworkbench/core/src/ui/index.ts

Even if src were published, the entry wouldn't be consumable: the UI source uses package-internal @/ aliases and a raw Tailwind stylesheet that a consumer's bundler can't process.

Solution

Ship the entrypoint built, per option 2 in the issue:

• New vite.lib.config.ts bundles src/ui/index.ts → dist/ui-lib/index.js (ESM) plus the compiled Tailwind stylesheet dist/ui-lib/styles.css. Only react/react-dom are external — the Dashboard brings its own router and query client — so embedding apps just need React, declared as optional peer dependencies (server-only consumers stay warning-free).
• tsup gains a dts-only entry emitting dist/ui-lib/index.d.ts. The public createAppRouter re-export is typed opaquely so the shipped declarations don't reference @tanstack/react-router/zod (bundled, not installed by consumers); the d.ts imports nothing but react/jsx-runtime and typechecks under skipLibCheck: false.
• Export map now points ./ui and ./ui/styles.css at the built files.
• Lazy router creation in app.tsx: TanStack's createRouter touches window.history at module scope, which crashed any non-browser import of the entry — including the issue's exact node -e repro and SSR frameworks like TanStack Start. The router is now created on first render.
• Desktop app keeps building the dashboard from source (with HMR) via an explicit vite alias instead of relying on the export map pointing at src.
• Regression test: every export target in package.json must point into dist/, the only published code directory.

Verification

Against a real npm pack tarball installed into a fresh consumer app:

• node -e "import('@getworkbench/core/ui')" (the issue's repro) succeeds; all documented exports present; ./ui/styles.css resolves.
• A consumer .tsx rendering <Dashboard /> typechecks with skipLibCheck: false.
• Tarball contains dist/ui-lib/{index.js,index.d.ts,styles.css} and no src/ files.
• bun test (18 pass), tsc --noEmit, biome on changed files, full core build, and the desktop app's build + typecheck all pass.

Note: the lib bundle is ~480 KB gzipped since the Dashboard is self-contained (router, query client, charts, flow renderer). Only apps importing /ui pay that cost.

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