Update upload_excel() to read all pages in a file instead of just 1

app.py

@@ -40,9 +40,13 @@ def check_occupancy(month: str) -> str:
 def upload_excel(file):
     if file is None:
         return "Please upload an Excel file."
-    df = pd.read_excel(file.name)
-    dataframes["df"] = df
-    return f"✅ File loaded with {len(df)} rows and {len(df.columns)} columns."
+    dfs = pd.read_excel(file.name, sheet_name=None)
+    dataframes.clear()
+    dataframes.update(dfs)
+    sheet_info = []
+    for name, df in dfs.items():
+        sheet_info.append(f"'{name}': {len(df)} rows, {len(df.columns)} cols")
+    return f"✅ Loaded sheets: {', '.join(sheet_info)}"
 
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 # LangChain Agent Setup