fix: liveboard name blank panel value now auto-derives from company URL

Was falling back to Supabase saved value when panel was blank,
overriding the intentional blank. Now reads only from self.settings
(panel value set at GO time); auto-derive from company URL handles blank.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

chat_interface.py

@@ -3810,7 +3810,7 @@ This chat will update when complete."""
             
             # Load settings
             settings = load_gradio_settings(self._get_effective_user_email())
-            liveboard_name = self.settings.get('liveboard_name', '') or settings.get('liveboard_name', '')
+            liveboard_name = self.settings.get('liveboard_name', '')
             
             # Default liveboard name to company name (without .com) if blank
             if not liveboard_name: