ci: add spacecraft-viewer build to GitHub Actions

Added spacecraft-viewer library build steps to deployment and CI workflows:

**Deploy workflow (deploy-spacecraft.yml):**
- Added build step for spacecraft-viewer before GitHub Pages deployment
- Builds dist/ artifacts alongside controller

**New CI workflow (ci-build-viewer.yml):**
- Runs on PRs and pushes to WebSites/spacecraft-viewer/**
- Installs dependencies with npm
- Runs test suite (npm test)
- Builds library (npm run build)
- Reports bundle size from dist/

This ensures spacecraft-viewer is built and tested in CI, and deployed
to GitHub Pages with the controller.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: Max Carlson

.github/workflows/ci-build-viewer.yml

@@ -0,0 +1,43 @@
+name: CI Build Viewer
+
+on:
+  pull_request:
+    paths:
+      - 'WebSites/spacecraft-viewer/**'
+  push:
+    paths:
+      - 'WebSites/spacecraft-viewer/**'
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: "Build and Test spacecraft-viewer"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v4
+
+      - name: Install node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22.x'
+
+      - name: Install dependencies
+        run: |
+          cd ./WebSites/spacecraft-viewer
+          npm install
+
+      - name: Run tests
+        run: |
+          cd ./WebSites/spacecraft-viewer
+          npm test
+
+      - name: Build library
+        run: |
+          cd ./WebSites/spacecraft-viewer
+          npm run build
+
+      - name: Check bundle size
+        run: |
+          cd ./WebSites/spacecraft-viewer
+          ls -lh dist/

.github/workflows/deploy-spacecraft.yml

@@ -43,6 +43,12 @@ jobs:
           pnpm install
           pnpm build
 
+      - name: Build spacecraft-viewer
+        run: |
+          cd ./WebSites/spacecraft-viewer
+          npm install
+          npm run build
+
       - name: Setup Pages
         uses: actions/configure-pages@v4