fix(docker): force fresh install of optional native deps (lightningcss)

npm run build failed with "Cannot find module lightningcss.linux-x64-
gnu.node". Tailwind v4 pulls lightningcss whose platform binary ships as
an optionalDependency, and npm has a long-standing bug that skips those
when a lockfile is present. Drop the lockfile in the deps stage and
install with --include=optional so the Linux binary is fetched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: guillermoscript

Dockerfile

@@ -9,7 +9,10 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     && rm -rf /var/lib/apt/lists/*
 WORKDIR /app
 COPY package.json package-lock.json ./
-RUN npm install
+# Remove the lockfile so npm freshly resolves platform-specific optional
+# native binaries (lightningcss/Tailwind v4) for this Linux image — npm has a
+# long-standing bug that skips optional native deps when a lockfile is present.
+RUN rm -f package-lock.json && npm install --include=optional
 
 # Build
 FROM base AS builder