Update .codesandbox/Dockerfile

.codesandbox/Dockerfile

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+# Use CodeSandbox's TypeScript-Node image for full editor support
+FROM ghcr.io/codesandbox/devcontainers/typescript-node:latest
+
+# Install zsh and additional tools (required by CodeSandbox)
+RUN apt-get update && apt-get install -y \
+    zsh \
+    git \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Enable corepack for pnpm/yarn support
+RUN corepack enable
+
+# Set workspace directory
+WORKDIR /workspace
+
+# Environment variables for Next.js
+ENV NODE_ENV=development
+ENV NEXT_TELEMETRY_DISABLED=1
+
+# Set zsh as default shell (required by CodeSandbox)
+SHELL ["/bin/zsh", "-c"]