fix: template selection - add placeholder item and improve selection

- Add '-- Select a template --' as first item in combo box
- Block signals while refreshing to prevent unwanted callbacks
- Select newly created template automatically
- Fix index check to skip placeholder (index > 0 instead of >= 0)
- Add enable/disable based on whether templates exist

ui/main_window.py

@@ -1100,19 +1100,32 @@ class MainWindow(QMainWindow):
 
     def refresh_session_templates(self):
         """Refresh the session template list."""
+        # Block signals while updating to prevent triggering on_template_changed
+        self.template_combo.blockSignals(True)
+        
         self.template_combo.clear()
         
         # Load templates from database
         templates = self._load_templates_from_db()
         
+        # Add "Select a template..." as first item
+        self.template_combo.addItem("-- Select a template --", None)
+        
         for template in templates:
-            self.template_combo.addItem(
-                f"{template.activity_type.display_name} - {template.name}",
-                template
-            )
+            display_text = f"{template.activity_type.display_name} - {template.name}"
+            self.template_combo.addItem(display_text, template)
+        
+        # Restore signals
+        self.template_combo.blockSignals(False)
         
         self.log_debug("Templates", f"Loaded {len(templates)} session templates")
         
+        # If we have templates, enable the combo box
+        if len(templates) > 0:
+            self.template_combo.setEnabled(True)
+        else:
+            self.template_combo.setEnabled(False)
+
     def _load_templates_from_db(self) -> List[SessionTemplate]:
         """Load session templates from database."""
         templates = []
@@ -1176,7 +1189,18 @@ class MainWindow(QMainWindow):
                 )
                 self.db.commit()
                 
+                # Get the new template ID
+                new_id = result.lastrowid
+                
                 self.refresh_session_templates()
+                
+                # Select the newly created template
+                for i in range(self.template_combo.count()):
+                    template = self.template_combo.itemData(i)
+                    if template and template.id == new_id:
+                        self.template_combo.setCurrentIndex(i)
+                        break
+                
                 self.log_info("Templates", f"Created template: {name} ({activity_type.display_name})")
                 self.status_bar.showMessage(f"Template '{name}' created", 3000)
             except Exception as e:
@@ -1184,12 +1208,12 @@ class MainWindow(QMainWindow):
 
     def on_template_changed(self, index: int):
         """Handle template selection change."""
-        if index >= 0:
+        if index > 0:  # Skip first item which is "-- Select a template --"
             self.current_template = self.template_combo.currentData()
             if self.current_template:
                 self.current_template_label.setText(self.current_template.name)
                 self.current_template_label.setStyleSheet(f"font-weight: bold; color: {self.current_template.activity_type.color};")
-                self.log_debug("Templates", f"Selected template: {self.current_template.name}")
+                self.log_info("Templates", f"Selected template: {self.current_template.name}")
                 self._update_start_button()
         else:
             self.current_template = None