fix: right-button double click no longer wipes rotation mid-drag (v1.7.2)

Two rotate drags started quickly at nearly the same spot were treated as a
double click: the reset was detected on button down against the previous down
time/position, so it wiped all effects and ignored the second drag, leaving
Ctrl+S to save an unrotated crop.

- Double click is now only counted for actual clicks (movement <= 4px) and is
  decided on button up; a drag breaks the chain.
- Pointer up is matched by pointer id, so a left-drag pan never counts as a click.
- dist: 1.7.2 .deb replaces the tracked 1.7.1 package.

lib/widgets/image_canvas.dart

@@ -41,6 +41,11 @@ class ImageCanvasState extends State<ImageCanvas> {
   double _startBrightness = 0;
   DateTime? _lastRightTapTime;
   Offset _lastRightTapPos = Offset.zero;
+  /// Sağ tuş basılıyken anlamlı hareket oldu mu? (tıklama mı sürükleme mi)
+  bool _rightDragMoved = false;
+  int? _rightPointerId;
+  /// Sürükleme sayılma eşiği (px) — rotate/contrast ince ayarında el titremesi.
+  static const double _dragClickSlop = 4;
 
   // ── Klavye modifier tracking ──
   bool _ctrlPressed = false;
@@ -311,23 +316,8 @@ class ImageCanvasState extends State<ImageCanvas> {
     if (e.buttons != kSecondaryMouseButton) return;
 
     _pointerDownPos = e.localPosition;
-
-    final now = DateTime.now();
-    if (_lastRightTapTime != null &&
-        now.difference(_lastRightTapTime!) < const Duration(milliseconds: 400) &&
-        (e.localPosition - _lastRightTapPos).distance < 20) {
-      _angle = 0;
-      _contrast = 1.0;
-      _saturation = 1.0;
-      _brightness = 0;
-      _flipH = false;
-      _interactionMode = 'none';
-      _markRenderDirty();
-      _lastRightTapTime = null;
-      return;
-    }
-    _lastRightTapTime = now;
-    _lastRightTapPos = e.localPosition;
+    _rightDragMoved = false;
+    _rightPointerId = e.pointer;
 
     if (_ctrlPressed && _shiftPressed) {
       _interactionMode = 'brightness';
@@ -346,6 +336,10 @@ class ImageCanvasState extends State<ImageCanvas> {
 
   void _onPointerMove(PointerMoveEvent e) {
     if (e.buttons != kSecondaryMouseButton) return;
+    if (!_rightDragMoved &&
+        (e.localPosition - _pointerDownPos).distance > _dragClickSlop) {
+      _rightDragMoved = true;
+    }
 
     final dy = e.localPosition.dy - _pointerDownPos.dy;
 
@@ -367,7 +361,30 @@ class ImageCanvasState extends State<ImageCanvas> {
   }
 
   void _onPointerUp(PointerUpEvent e) {
+    if (e.pointer != _rightPointerId) return;
+    _rightPointerId = null;
     _interactionMode = 'none';
+    // Sürükleme ile biten etkileşim sağ çift tık zincirini keser; yalnızca
+    // gerçek tıklamalar (hareketsiz bas-bırak) çift tık sayılır.
+    if (_rightDragMoved) {
+      _lastRightTapTime = null;
+      _rightDragMoved = false;
+      return;
+    }
+    final now = DateTime.now();
+    final isDouble = _lastRightTapTime != null &&
+        now.difference(_lastRightTapTime!) < const Duration(milliseconds: 400) &&
+        (e.localPosition - _lastRightTapPos).distance < 20;
+    _lastRightTapTime = isDouble ? null : now;
+    _lastRightTapPos = e.localPosition;
+    if (isDouble) {
+      _angle = 0;
+      _contrast = 1.0;
+      _saturation = 1.0;
+      _brightness = 0;
+      _flipH = false;
+      _markRenderDirty();
+    }
   }
 
   // ── Combined color filter (brightness × saturation × contrast) ──