Refactored Studio + impl App into lib.rs (was main.rs). Added a
#[wasm_bindgen] start_in_canvas entry plus index.html/Trunk.toml so
the same code runs in a browser tab via:
rustup target add wasm32-unknown-unknown
cargo install trunk
cd road_parceling_studio && trunk serve
Native still builds with `cargo run -p road_parceling_studio`.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
