Fix octave override to prevent root note changes during preset cycling

- Make octave override checkbox prevent root note changes that affect octave
- Add comprehensive debug logging for root note and octave override behavior
- Ensure both root_note and octave overrides block root note preset changes
- Fix parameter mapping between octave buttons (C2,C3,C4) and override system

The octave override now properly prevents preset cycling from changing which
octave the root note is in (C2 vs C3 vs C4 etc.), while still allowing
the octave range parameter to be changed if needed.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

gui/preset_controls.py

@@ -375,20 +375,26 @@ class PresetControls(QWidget):
             arp_settings = preset.get("arpeggiator", {})
             
             # Only apply settings that aren't overridden
-            if not self._is_parameter_overridden('root_note'):
+            # Check both root_note and octave overrides for root note changes
+            if not self._is_parameter_overridden('root_note') and not self._is_parameter_overridden('octave'):
                 self.arpeggiator.set_root_note(arp_settings.get("root_note", 60))
+                print(f"DEBUG: Applied root_note: {arp_settings.get('root_note', 60)}")
+            else:
+                override_type = "root_note" if self._is_parameter_overridden('root_note') else "octave"
+                print(f"DEBUG: Skipping root_note - {override_type} parameter is overridden")
             if not self._is_parameter_overridden('scale'):
                 self.arpeggiator.set_scale(arp_settings.get("scale", "major"))
             if not self._is_parameter_overridden('scale_note_start'):
                 self.arpeggiator.set_scale_note_start(arp_settings.get("scale_note_start", 0))
             if not self._is_parameter_overridden('pattern_type'):
                 self.arpeggiator.set_pattern_type(arp_settings.get("pattern_type", "up"))
+            # Check for octave override when changing octave_range
             if not self._is_parameter_overridden('octave'):
                 octave_range = arp_settings.get("octave_range", 1)
                 print(f"DEBUG: Applying octave_range: {octave_range}")
                 self.arpeggiator.set_octave_range(octave_range)
             else:
-                print(f"DEBUG: Skipping octave_range - parameter is overridden")
+                print(f"DEBUG: Skipping octave_range - octave parameter is overridden")
             if not self._is_parameter_overridden('note_speed'):
                 self.arpeggiator.set_note_speed(arp_settings.get("note_speed", "1/8"))
             if not self._is_parameter_overridden('gate'):