fix(dashboard): bundle header logo with next/image for reliable staging

Made-with: Cursor

frontend/Dockerfile

@@ -37,10 +37,10 @@ ENV NEXT_TELEMETRY_DISABLED=1
 RUN addgroup --system --gid 1001 nodejs && \
     adduser --system --uid 1001 nextjs
 
-# Copy necessary files
-COPY --from=builder /app/public ./public
+# Standalone first, then static assets; public last so it is not overwritten by any nested folder in standalone.
 COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
 COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+COPY --from=builder --chown=nextjs:nodejs /app/public ./public
 
 USER nextjs