Add debug endpoint to inspect actual file contents on server

app.py

@@ -508,6 +508,38 @@ async def serve_map():
         raise
 
 
+@app.get("/debug/file-content", tags=["Debug"])
+async def debug_file_content():
+    """Debug endpoint to show actual file contents"""
+    try:
+        with open("static/map.html", encoding="utf-8") as f:
+            content = f.read()
+        
+        # Extract key indicators
+        has_fire_emoji = "🔥" in content
+        has_v4 = "V4.0" in content
+        has_blue_theme = "#3b82f6" in content
+        has_red_border = "#ff0000" in content
+        
+        return {
+            "file_exists": True,
+            "content_length": len(content),
+            "indicators": {
+                "has_fire_emoji": has_fire_emoji,
+                "has_v4_version": has_v4,
+                "has_blue_theme": has_blue_theme,
+                "has_red_debug_border": has_red_border
+            },
+            "first_200_chars": content[:200],
+            "title_line": next((line.strip() for line in content.split('\n') if '<title>' in line), "not found")
+        }
+    except Exception as e:
+        return {
+            "file_exists": False,
+            "error": str(e)
+        }
+
+
 @app.get("/api/trees", response_model=list[Tree], tags=["Trees"])
 async def get_trees(
     limit: int = 100,