Update interface.js

interface.js

@@ -258,6 +258,9 @@ const currentScriptTag = document.currentScript;
       );
     }
 
+    // --- Fix: Ensure icon is always reset on exit
+    if (fullscreenToggle) fullscreenToggle.textContent = '⇱';
+
     savedState = null;
   }
 
@@ -283,7 +286,8 @@ const currentScriptTag = document.currentScript;
       viewerModule.app.resizeCanvas(window.innerWidth, window.innerHeight);
     }
 
-    fullscreenToggle.textContent = '⇲';
+    // --- Fix: Always set fullscreen icon when entering
+    if (fullscreenToggle) fullscreenToggle.textContent = '⇲';
     isFullscreen = true;
   }
 
@@ -312,6 +316,8 @@ const currentScriptTag = document.currentScript;
     widgetContainer.classList.remove('fake-fullscreen');
     restoreOriginalStyles();
     isFullscreen = false;
+    // --- Fix: Also ensure icon is set on all code paths
+    if (fullscreenToggle) fullscreenToggle.textContent = '⇱';
   }
 
   // 10. Hook up event listeners
@@ -319,10 +325,14 @@ const currentScriptTag = document.currentScript;
     hideTooltipPanel();
     isFullscreen ? exitFullscreen() : enterFullscreen();
   });
+
   document.addEventListener('fullscreenchange', () => {
     if (!document.fullscreenElement && isFullscreen) {
       isFullscreen = false;
       restoreOriginalStyles();
+      if (fullscreenToggle) fullscreenToggle.textContent = '⇱';
+    } else if (document.fullscreenElement === widgetContainer) {
+      if (fullscreenToggle) fullscreenToggle.textContent = '⇲';
     }
   });