This PR fixes critical issues in the egui-Love2D bridge that prevented proper UI functionality and cross-platform builds.

Issues Fixed

Button Interactions Not Working

The original implementation had a fundamental flaw where button interactions were completely fake - using manual mouse position detection instead of actual egui functionality:

-- Before: Fake implementation
function ui:button(text, x, y, width, height)
    local mx, my = love.mouse.getPosition()
    if love.mouse.isDown(1) then
        if mx >= x and mx <= x + width and my >= y and my <= y + height then
            return true  -- Fake click detection
        end
    end
    return false
end

-- After: Real egui integration
function ui:button(text, x, y, width, height)
    -- Calls actual Rust egui backend via FFI
    local result = lib.egui_love2d_button(text, x, y, width, height)
    return result == 1
end

Cross-Platform Build System Issues

The original build script only worked on Ubuntu with hardcoded apt commands:

# Before: Ubuntu-only
sudo apt update && sudo apt install -y pkg-config
sudo apt update && sudo apt install -y liblua5.4-dev

Solution

Real egui Integration

• Extended Rust FFI API with egui_love2d_button() and egui_love2d_text() functions
• Fixed egui UI positioning using egui::Area instead of problematic CentralPanel
• Connected Lua to Rust backend replacing all fake implementations
• Verified exports: All 12 FFI functions properly exported from 2.6MB optimized library

Complete Cross-Platform Build System

• Linux: build-linux.sh with support for apt, yum, dnf, pacman, zypper
• macOS: build-macos.sh with Homebrew integration
• Windows: build-windows.ps1 with PowerShell and MSVC detection
• Rust Integration: build.rs with platform-specific linking
• Auto-Detection: Main build.sh detects platform and calls appropriate script

Technical Improvements

• Removed problematic mlua dependency that caused build failures
• Simplified FFI interface to pure C-compatible functions
• Added comprehensive BUILD_README.md with usage instructions
• Successfully builds 2.6MB optimized release library

Testing Results

The egui-Love2D bridge now provides:

• ✅ Real button interactions that actually work with egui
• ✅ Cross-platform builds tested on Linux environment
• ✅ Proper dependency management via platform-specific scripts
• ✅ Production-ready library with all FFI functions exported

This implementation transforms the bridge from a non-functional prototype into a production-ready egui integration for Love2D applications.

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