28 thumb bug (#29)

* feat: add ModifierKeyType enum and palm rejection preferences

- Add ModifierKeyType enum with shift/control/option/command
- Add exclusion zone preferences (enabled, size)
- Add modifier key preferences (requireKey, keyType)
- Add contact size filter preferences (enabled, maxSize)
- Update GestureConfiguration with palm rejection fields
- Update UserPreferences.gestureConfig to include new options

* feat: add persistence for palm rejection preferences

- Add UserDefaults keys for exclusion zone settings
- Add UserDefaults keys for modifier key settings
- Add UserDefaults keys for contact size filter settings
- Register defaults for all new preferences
- Update loadPreferences() to load new settings
- Update savePreferences() to persist new settings

* feat: implement palm rejection touch filtering

- Add modifier key check at start of processTouches()
- Filter touches in exclusion zone (bottom of trackpad)
- Filter touches exceeding max contact size threshold
- Add getModifierFlags() helper using CGEventSource
- Cancel active gesture if modifier key released

* feat: add Palm Rejection submenu to Advanced menu

- Add createPalmRejectionMenu() with three sections
- Add exclusion zone toggle and size options (10-25%)
- Add modifier key toggle and key type selector
- Add contact size filter toggle and threshold options
- Add action methods for all new preferences
- Dynamically show/hide options based on toggle state

* refactor: Pass modifier flags to gesture recognizer from main thread for reliable state.

* test: add palm rejection configuration and ModifierKeyType tests

- Add tests for GestureConfiguration palm rejection defaults
- Add tests for UserPreferences palm rejection defaults
- Add test for UserPreferences -> GestureConfiguration mapping
- Add tests for ModifierKeyType display names and raw values
- Add test for ModifierKeyType CaseIterable conformance

* test: add GestureRecognizerTests for palm rejection filters

- Add new test file GestureRecognizerTests.swift with 12 tests
- Add tests for modifier key requirement (all 4 types)
- Add tests for exclusion zone filtering
- Add tests for contact size filtering
- Add combined filter test
- Add GestureRecognizer.swift to test target

Includes MockGestureRecognizerDelegate for testing callbacks.

* docs: fix misleading comment about thread context

The comment claimed modifier flags were captured on the main thread,
but deviceMonitor callback actually runs on a framework-managed
background thread. CGEventSource.flagsState is thread-safe per Apple
docs, so this is fine, but the comment was inaccurate.

* test: add partial filter tests for palm rejection

Add 4 new tests for scenarios where some touches are filtered
while others pass palm rejection filters:

- testExclusionZone_PartialFiltering_FiveTouchesThreePass
- testContactSizeFilter_PartialFiltering_FiveTouchesThreePass
- testCombinedFilters_PartialFiltering_SixTouchesThreePass
- testPartialFiltering_InsufficientRemainingTouches

These verify gestures activate when exactly 3 valid touches
remain after filtering, regardless of total touch count.

Author: NullPointerDepressiveDisorder

MiddleDrag.xcodeproj/project.pbxproj

@@ -486,7 +486,7 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
-				MARKETING_VERSION = 1.3.2;
+				MARKETING_VERSION = 1.3.3;
 				OTHER_LDFLAGS = (
 					"-framework",
 					MultitouchSupport,
@@ -526,7 +526,7 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
-				MARKETING_VERSION = 1.3.2;
+				MARKETING_VERSION = 1.3.3;
 				OTHER_LDFLAGS = (
 					"-framework",
 					MultitouchSupport,