em Units Conversion: Converted all hardcoded px declarations across all 7 stylesheets (variables.css, hud.css, actions.css, drawer.css, portrait.css, movement.css, tooltip.css) into relative em units (1em = 16px) for responsive scaling across display resolutions.canvas.app.ticker.FPS) in both top header pill and player popup header.X close button from player popup header.system.technology.equipped), setting equipped = false for non-selected items.PhysicalResistTest & StunResistTest) to trigger character damage grunts upon 3D dice completion (diceSoNiceRollComplete).MovementService) to track token grid coordinate histories directly on canvas tokens, restoring position and allowances seamlessly upon undo (Ctrl+Z)..shadows-crosshair-attack-hud) with glowing red filter.selectedToken flags.Equipped (Ausgerüstet), In Hand (In der Hand), No weapons found, Prepare Weapon / Spell, and popup hover titles.box-sizing: border-box and removed hover translateX shifts on popup items to prevent right-edge clipping.README.md and developer manual DEV_README.md, including Discord server invite (Shadow Plays), datdamnzotz audio credits, TheRipper93 inspiration credits, and fan content disclaimer.