Fix tactical UI integration: heat application, weapon tracking, toggle consistency, coordinate system

[Copilot]

Problem

Four integration issues prevented tactical UI from functioning correctly:

1. Weapons not applying heat generation on fire
2. Current weapon not tracked for UI/resistance calculations
3. 'U' toggle only hiding DOM elements, not canvas-rendered enemy indicators
4. Floating damage text using world coordinates instead of screen coordinates

Changes

CombatSystem - Heat Application and Weapon Tracking

• updateWeapon() now calls fireWeaponWithHeat() instead of fireWeapon()
• Sets playerComp.currentWeapon = weapon.data when firing to track active weapon

UISystem - Toggle State and Positioning

• Toggle state stored in world.gameState.tacticalUIEnabled for cross-system visibility
• Floating damage elements use position: fixed for canvas screen coordinate alignment

RenderSystem - Enemy Indicator Visibility

• drawEnemyResistanceIndicator() checks gameState.tacticalUIEnabled before rendering
• Enemy resistance symbols (▼/■/▲) now respect tactical UI toggle

GameState - Shared State

• Added tacticalUIEnabled: true field for consistent toggle state across systems

Result

All tactical UI components (defense bars, heat gauge, weapon display, damage text, enemy indicators) now function as a cohesive unit with proper physics integration and coordinate handling.

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