fix: batch backtest ini generation and report collection

- Replace Inputs= with [TesterInputs] section in ini files so MT5
  cannot override set file parameters with cached/default values
- Fix build_ini to use caller-supplied report_name instead of
  recomputing a generic name, ensuring each run gets a unique ini
- Replace shutil.copy2 + delete loop with shutil.move for htm reports
- Add companion PNG move (name, -holding, -mfemae, -hst) to reports folder
- Fix Streamlit folder warning appearing in wrong conditional branch

Applies to both mt5_batch_backtest.py and view_batch_backtest.py

view_portfolio_master.py

@@ -41,6 +41,7 @@ def _parse_file(file_obj):
 
 
 def _normalise(df: pd.DataFrame, label: str) -> pd.DataFrame:
+    df = df.copy()  # ensure we never mutate the original
     col_map = {}
     def _f(targets, dest):
         for c in targets:
@@ -516,11 +517,18 @@ def render():
                 if stem not in st.session_state.pm_files:
                     df = _parse_file(f)
                     if df is not None:
-                        df = _normalise(df, stem)
+                        df = _normalise(df.copy(), stem)
                         st.session_state.pm_files[stem] = df
                         st.success(f"✅ **{stem}** — {len(df):,} trades")
 
         if st.session_state.pm_files:
+            # Clear all button
+            if st.button("🗑 Clear All Files", key="pm_clear_all"):
+                st.session_state.pm_files = {}
+                st.session_state.pm_custom_names = {}
+                st.session_state.pm_results = []
+                st.rerun()
+
             to_remove = []
             for label in list(st.session_state.pm_files):
                 c1, c2 = st.columns([6,1])