CI for Dev and Main

.changeset/README.md

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+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets)
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md)

.changeset/config.json

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+{
+  "$schema": "https://unpkg.com/@changesets/config@3.1.2/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": ["@timeline/demo"]
+}

.github/workflows/ci.yml

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+name: CI
+
+on:
+  # Trigger on push to dev or main branches
+  push:
+    branches: [dev, main]
+
+  # Trigger on pull requests targeting dev or main
+  pull_request:
+    branches: [dev, main]
+
+  # Allow manual workflow dispatch
+  workflow_dispatch:
+
+jobs:
+  validate:
+    name: Build & Test
+    runs-on: ubuntu-latest
+
+    steps:
+      # ===== SETUP =====
+
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Full history for changeset validation
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10.28.2
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'pnpm'
+
+      # ===== DEV + MAIN: Core validation steps =====
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build all packages
+        run: pnpm run build
+        env:
+          CI: true
+
+      - name: Run tests
+        run: pnpm run test
+
+      - name: Verify package outputs
+        run: |
+          # Verify all packages built successfully
+          for pkg in core react ui; do
+            if [ ! -d "packages/$pkg/dist" ]; then
+              echo "❌ @timeline/$pkg build failed - no dist directory"
+              exit 1
+            fi
+            if [ ! -f "packages/$pkg/dist/index.d.ts" ]; then
+              echo "❌ @timeline/$pkg missing type declarations"
+              exit 1
+            fi
+          done
+
+          # Verify core internal exports
+          if [ ! -f "packages/core/dist/internal.d.ts" ]; then
+            echo "❌ @timeline/core missing internal type declarations"
+            exit 1
+          fi
+
+          echo "✅ All packages built successfully with type declarations"
+
+      # ===== MAIN ONLY: Release validation steps =====
+
+      - name: Verify changeset status
+        if: github.ref == 'refs/heads/main'
+        run: |
+          echo "📋 Checking changeset status for main branch..."
+          if pnpm changeset status 2>&1 | grep -q "no changesets were found"; then
+            echo "⚠️  Warning: Changes detected without changesets"
+            echo "ℹ️  Run 'pnpm changeset' to create a changeset before merging to main"
+            echo "ℹ️  Or run 'pnpm changeset add --empty' if no release is needed"
+            exit 1
+          else
+            pnpm changeset status
+            echo "✅ Changeset validation passed"
+          fi
+
+      - name: Check for uncommitted changes
+        if: github.ref == 'refs/heads/main'
+        run: |
+          echo "🔍 Verifying no uncommitted changes after build..."
+          if ! git diff --exit-code; then
+            echo "❌ Build produced uncommitted changes"
+            git diff
+            exit 1
+          fi
+          echo "✅ No uncommitted changes detected"
+
+      - name: Publish dry run
+        if: github.ref == 'refs/heads/main'
+        run: |
+          echo "🧪 Running publish dry run..."
+          pnpm changeset publish --dry-run
+          echo "✅ Publish dry run completed successfully"
+