Function imgui_owned_font_copy

src/host/ui_fonts.cpp:44–49

ImGui frees atlas-owned font data with IM_FREE, so the mutable copy the API wants must come from ImGui's own allocator; this replaces passing the embedded const arrays through const_cast with ownership disabled.

// API wants must come from ImGui's own allocator; this replaces passing
// the embedded const arrays through const_cast with ownership disabled.
void* imgui_owned_font_copy(const unsigned char* data, const std::size_t size) {
    void* copy = ImGui::MemAlloc(size);
    IM_ASSERT(copy != nullptr);
    std::memcpy(copy, data, size);
    return copy;
}

} // namespace