feat: implement pwa, add dockerfiles for web and cli, and introduce folder selection with wasm error handling.

Dockerfile.cli

@@ -0,0 +1,16 @@
+FROM python:3.11-slim
+
+# Install system dependencies for trimesh/shapely if needed
+RUN apt-get update && apt-get install -y \
+    libgl1-mesa-glx \
+    libglib2.0-0 \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY convert_nametags.py .
+
+ENTRYPOINT ["python", "convert_nametags.py"]