fix: add missing weapon_dpp and weapon_cost_per_hour parameters to start_session

- Added for backward compatibility with main_window.py
- These parameters are accepted but not used in the clean HUD
- Fixes TypeError when starting session

ui/hud_overlay_clean.py

@@ -530,6 +530,8 @@ class HUDOverlay(QWidget):
     
     def start_session(self, weapon: str = "Unknown", armor: str = "None",
                       fap: str = "None", loadout: str = "Default",
+                      weapon_dpp: Decimal = Decimal('0.0'),
+                      weapon_cost_per_hour: Decimal = Decimal('0.0'),
                       cost_per_shot: Decimal = Decimal('0.0'),
                       cost_per_hit: Decimal = Decimal('0.0'),
                       cost_per_heal: Decimal = Decimal('0.0')) -> None: