39 three finger select feature request (#41)

* feat: add Allow Relift During Drag option

Implements Linux-style text selection where drag continues with 2+ fingers
once initiated with 3 fingers. This allows lifting and repositioning the
third finger while maintaining the drag.

- Add allowReliftDuringDrag to GestureConfiguration and UserPreferences
- Modify GestureRecognizer to allow drag with 2+ fingers when enabled
- Add toggle in Advanced menu in MenuBarController
- Add 9 unit tests for new behavior

Closes #39

* fix: improve mouse movement smoothing and speed

- Fix EMA smoothing to properly blend current delta with previous
  instead of damping movement to 30%
- Add previousDeltaX/Y tracking for proper exponential moving average
- Reset smoothing state when drag ends
- Increase base scale factor from 800 to 1600 to match normal trackpad speed

* fix: Copilot suggestions

Author: NullPointerDepressiveDisorder

MiddleDrag.xcodeproj/project.pbxproj

@@ -425,7 +425,7 @@
 					"@executable_path/../Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 15.0;
-				MARKETING_VERSION = 1.4.0;
+				MARKETING_VERSION = 1.3.5;
 				OTHER_LDFLAGS = (
 					"-framework",
 					MultitouchSupport,
@@ -468,7 +468,7 @@
 					"@executable_path/../Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 15.0;
-				MARKETING_VERSION = 1.4.0;
+				MARKETING_VERSION = 1.3.5;
 				OTHER_LDFLAGS = (
 					"-framework",
 					MultitouchSupport,