Convert to proper npm library package (resolves #118)

- Fix .npmignore: remove /dist exclusion so compiled output ships with package
- Add files whitelist in package.json for explicit publish control
- Rename package to @microsoft/fluentui-editable-grid with public access
- Widen peerDependencies to support React 17, 18, and 19
- Replace Windows-only build scripts with cross-platform cross-env/rimraf/mkdirp
- Add CI workflow (build + verify on Node 16/18/20)
- Add publish workflow (npm publish on GitHub Release)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Alexander Elguezabal (from Dev Box)

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [16, 18, 20]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci --ignore-scripts
+
+      - name: Build library
+        run: npm run build
+
+      - name: Verify dist output
+        run: |
+          test -f dist/index.js || (echo "dist/index.js not found" && exit 1)
+          test -f dist/index.d.ts || (echo "dist/index.d.ts not found" && exit 1)
+          echo "✅ dist/ output verified"
+
+      - name: Check package contents
+        run: npm pack --dry-run

.github/workflows/publish.yml

@@ -0,0 +1,40 @@
+name: Publish to npm
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          registry-url: https://registry.npmjs.org
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci --ignore-scripts
+
+      - name: Build library
+        run: npm run build
+
+      - name: Verify dist output
+        run: |
+          test -f dist/index.js || (echo "dist/index.js not found" && exit 1)
+          test -f dist/index.d.ts || (echo "dist/index.d.ts not found" && exit 1)
+          echo "✅ dist/ output verified"
+
+      - name: Publish to npm
+        run: npm publish --provenance --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

.npmignore

@@ -4,7 +4,6 @@
 /node_modules
 /.pnp
 .pnp.js
-/dist
 
 # testing
 /coverage