separate out renderer crate (#13)

* add keyboard handler

* some cleanup

* add l key binding

* Fix WASM shared memory generation for Rust nightly 2025-10-20+

Add explicit linker flags for shared memory generation after Rust PR #147225
removed automatic flags with +atomics. This fixes DataCloneError when sharing
memory with workers.

Changes:
- Add --shared-memory, --max-memory, --import-memory flags
- Export TLS symbols: __wasm_init_tls, __tls_size, __tls_align, __tls_base
- Update both Cargo.toml and package.json build scripts

Amp-Thread-ID: https://ampcode.com/threads/T-41d99b69-5754-4fdf-b06e-a46343fa7485
Co-authored-by: Amp <amp@ampcode.com>

* add a level-editor crate

* remove redundant worker setup

* simplify app setup

* add SceneBuilder

* separate out default scene implementation in a crate

* define default method for MeshBuilder

---------

Co-authored-by: Amp <amp@ampcode.com>

Dockerfile

@@ -0,0 +1,38 @@
+FROM node:22-alpine
+
+# Install Rust nightly and required tools
+RUN apk add --no-cache \
+    build-base \
+    curl \
+    && curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y \
+    && source ~/.cargo/env \
+    && rustup default nightly-2025-10-20 \
+    && rustup toolchain install nightly-2025-10-20 \
+    && rustup target add wasm32-unknown-unknown --toolchain nightly-2025-10-20 \
+    && rustup component add rust-src --toolchain nightly-2025-10-20 \
+    && curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+
+# Set environment variables for Rust
+ENV PATH="/root/.cargo/bin:$PATH"
+ENV RUSTFLAGS="-C target-feature=+atomics,+bulk-memory,+mutable-globals"
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package.json yarn.lock ./
+
+# Install Node.js dependencies
+RUN yarn install
+
+# Copy source code
+COPY . .
+
+# Build the project
+RUN yarn run build
+
+# Expose port for serving
+EXPOSE 8080
+
+# Command to serve the built application
+CMD ["yarn", "start", "--", "--host"]