Fix missing startGame event listener - game start flow broken

[Copilot]

Game was unplayable due to missing event listener. UISystem dispatches startGame CustomEvent after ship selection, but no handler existed in Game.js to catch it and initiate gameplay.

Changes

Game.js - Added missing event listener:

document.addEventListener('startGame', (e) => {
    if (e.detail && e.detail.shipId) {
        this.gameState.selectedShip = e.detail.shipId;
        this.startGame();
    }
});

Event Flow

SOLO → Ship Selection → START button
    ↓
UISystem.js:1297 dispatches CustomEvent('startGame')
    ↓
[MISSING] Game.js had no listener
    ↓
Game never started

Now complete: event dispatched → listener catches → game starts.

Impact

• Fixes complete game blocker (P0)
• Solo mode now functional
• Multiplayer flow unaffected (uses different path)

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