🐛 fix nisse info panel no longer pauses the game

Removes uiMenuOpen/uiMenuClose calls from openNisseInfoPanel() and
closeNisseInfoPanel() — the info panel is an observational overlay and
should not interrupt the game loop. Closes #15.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/scenes/UIScene.ts

@@ -692,7 +692,6 @@ export class UIScene extends Phaser.Scene {
   private openNisseInfoPanel(villagerId: string): void {
     this.nisseInfoId = villagerId
     this.nisseInfoVisible = true
-    this.scene.get('Game').events.emit('uiMenuOpen')
     this.buildNisseInfoPanel()
   }
 
@@ -703,7 +702,6 @@ export class UIScene extends Phaser.Scene {
     this.nisseInfoId = null
     this.nisseInfoGroup.destroy(true)
     this.nisseInfoGroup = this.add.group()
-    this.scene.get('Game').events.emit('uiMenuClose')
   }
 
   /**