fix: Restore working site from commit 668f690

Root causes fixed:
1. Dockerfile: Use astro preview (not serve package)
2. Astro auto-copies public/ to dist/ during build
3. CSS: Proper Tailwind v4 syntax with @theme
4. Images: Copied all from spec_images/ and table_images/
5. Header/Footer: Added to homepage

Working features:
- 15 pages build successfully
- All images load
- CSS with industrial theme colors
- Header and Footer on homepage
- Fixed header (no overlap)

Restored to match commit 668f690 quality.

Dockerfile

@@ -3,45 +3,41 @@ FROM node:20-alpine AS builder
 
 WORKDIR /app
 
+# Copy package files
 COPY package*.json ./
+
+# Install dependencies
 RUN npm install
 
+# Copy source code
 COPY . .
 
-# Create data directory for database
-RUN mkdir -p data
-
-# Build Astro
+# Build the project
 RUN npm run build
 
-# Copy public folder to dist (Astro doesn't do this automatically)
-RUN cp -r /app/public/* /app/dist/
-
 # Production Stage
 FROM node:20-alpine
 
 WORKDIR /app
 
-# Install SQLite runtime
-RUN apk add --no-cache sqlite-libs
-
+# Copy package files
 COPY package*.json ./
+
+# Install production dependencies only
 RUN npm install --production
 
 # Copy built assets from builder
 COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/astro.config.mjs ./
 COPY --from=builder /app/data ./data
 
-EXPOSE 80
+# Expose port
+EXPOSE 4321
 
 # Health check
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
-  CMD node -e "require('http').get('http://localhost:80', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
+  CMD node -e "require('http').get('http://localhost:4321', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
 
-ENV NODE_ENV=production
-ENV ASTRO_DB_REMOTE_URL=file:/app/data/consent.db
-ENV HOST=0.0.0.0
-ENV PORT=80
-
-# Serve static files from dist
-CMD ["npx", "serve", "dist", "-l", "80", "--no-clipboard", "--cors"]
+# Start the server
+CMD ["npm", "run", "preview", "--", "--host", "0.0.0.0", "--port", "4321"]