feat: collapsible expansion, canonical pages, citations

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Python deps (sqlite3 is stdlib — no pip package needed)
+COPY site/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy pipeline and data (cache-bust on each deploy)
+ARG CACHE_BUST=20260816-1527
+COPY pipeline/ ./pipeline/
+RUN mkdir -p ./data
+
+# Copy site (Astro static build)
+COPY site/ ./site/
+
+# Build Astro static site if dist/ doesn't exist
+# (build-essential is for better-sqlite3 native Node addon compilation)
+RUN if [ ! -d site/dist ]; then \
+    apt-get update && \
+    apt-get install -y --no-install-recommends build-essential curl && \
+    curl -fsSL https://deb.nodesource.com/setup_20.x | bash - && \
+    apt-get install -y nodejs && \
+    cd site && npm install && npm run build && cd .. && \
+    apt-get remove -y build-essential nodejs && \
+    apt-get autoremove -y && \
+    rm -rf /var/lib/apt/lists/*; \
+    fi
+
+# Copy Space entry point
+COPY space_app.py ./app.py
+
+EXPOSE 7860
+
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]