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Canvas is a move-only type without a copy constructor. Since C++17 requires types stored in std::optional to be copy-constructible unless explicitly allowed, Clang 20+ emits an error when attempting to instantiate std::optional<Canvas>. While GCC allows this as an extension, Clang enforces the standard more strictly. This PR replaces std::optional<Canvas> with std::unique_ptr<Canvas> to resolve the build error with Clang 20+ while keeping functional behavior identical. Tested with GCC 15.1.0 and Clang 20.1.7. Co-Authored-By: Ryan Foster <ryan@obsproject.com>