Real Skill Icons + Nav Updates

/classes/calculator now uses real AAEmu skill icons. 137 DDS files extracted from the game_pak via pythonnet+AAPacker, converted to PNG with Pillow, served from /classes/calculator/img/skills/. XML exporter updated to point each skill at its actual icon. No more grey-hand placeholders. Also: Wiki added to the top nav (between Trade and Play Now), Skill Calculator added to the mobile drawer + The Hearth footer column. Run 'python C:/Echo/scripts/extract_skill_icons.py' once after a game_pak update to refresh icons, then 'python C:/Echo/scripts/skills_xml_export.py' to rebuild the XML. https://rookeryisles.com/classes/calculator