fix: remove redundant playwright install-deps, exclude PDFs from docker context

.dockerignore

@@ -10,3 +10,8 @@ dist/
 .mypy_cache/
 tests/
 *.md
+*.pdf
+app/handbook_pdf/
+app/__pycache__/
+images/*.pdf
+*.md

Dockerfile

@@ -35,8 +35,8 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Set browser path BEFORE install so Playwright puts browsers here
 ENV PLAYWRIGHT_BROWSERS_PATH=/ms-playwright
 
-# Install Playwright Chromium browser (single layer)
-RUN playwright install --with-deps chromium
+# Install Playwright Chromium browser only (system deps already installed above)
+RUN playwright install chromium
 
 # Copy application code
 COPY app/ ./app/