feat: add follow mode command legend panel

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

client/src/scenes/GameScene.ts

@@ -30,6 +30,7 @@ export class GameScene extends Phaser.Scene {
   private npcInfoPanel!: NpcInfoPanel;
   private emojiManager!: InteractionEmojiManager;
   private commandPanel!: CommandPanel;
+  private followCommandPanel!: CommandPanel;
 
   constructor() {
     super({ key: 'GameScene' });
@@ -47,6 +48,11 @@ export class GameScene extends Phaser.Scene {
     this.emojiManager = new InteractionEmojiManager();
     this.commandPanel = new CommandPanel('COMMANDS', [{ key: '1', label: 'Spawn NPC' }]);
     this.commandPanel.show(); // Start in camera mode, so show immediately
+    this.followCommandPanel = new CommandPanel('FOLLOW', [
+      { key: '\u2190 \u2192', label: 'Cycle NPC' },
+      { key: '1', label: 'Highlight' },
+      { key: 'TAB', label: 'Camera Mode' },
+    ]);
 
     // Draw tile grid
     this.drawWorld();
@@ -79,8 +85,10 @@ export class GameScene extends Phaser.Scene {
       if (this.mode === 'follow') {
         this.showFollowPanel();
         this.commandPanel.hide();
+        this.followCommandPanel.show();
       } else if (prevMode === 'follow') {
         this.npcInfoPanel.hide();
+        this.followCommandPanel.hide();
       }
 
       // Command panel visibility