Map concepts to semantically appropriate icons across Lucide, Heroicons, and Phosphor libraries.

• Provides a quick reference table of 20 common concepts with icon names across all three libraries, plus a decision tree for selecting icons when uncertain
• Covers sizing rules (16px inline to 64px decorative), consistency patterns (no style mixing, no emoji), and tree-shaking best practices to avoid bundling unused icons
• Includes semantic mapping, React/HTML templates, and library comparison resources to guide library selection based on project needs
• Enforces explicit icon maps over dynamic imports to preserve tree-shaking and maintain bundle efficiency