chore: supprime le code mort signale par flutter analyze

Retire imports, champs et variables locales non utilises (14 warnings) :
- imports inutilises (app, database_helper, impact_editor, target_calibration, session_provider)
- champs write-only de capture_screen (_cropService, _scanAnimation, _isCameraInitialized, _alignmentStatus) et _movingShotId
- bloc de calcul mort dans crop_screen et variables locales (themeProvider, ny)

_filterType (history_screen) volontairement conserve : c'est une fonctionnalite de filtre inachevee, pas du code mort.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lib/features/capture/capture_screen.dart

@@ -15,7 +15,6 @@ import '../../data/models/target_type.dart';
 import '../crop/crop_screen.dart';
 import '../session/session_provider.dart';
 import 'widgets/image_source_button.dart';
-import '../../services/image_crop_service.dart';
 import '../../services/opencv_target_service.dart';
 import '../../services/parallelism_service.dart'; // NOUVEAU
 import 'package:image/image.dart' as img;
@@ -31,7 +30,6 @@ class CaptureScreen extends StatefulWidget {
 class _CaptureScreenState extends State<CaptureScreen>
     with SingleTickerProviderStateMixin {
   final ImagePicker _picker = ImagePicker();
-  final ImageCropService _cropService = ImageCropService();
   final TargetType _selectedType = TargetType.concentric;
   final OpenCVTargetService _opencvService = OpenCVTargetService();
 
@@ -56,15 +54,12 @@ class _CaptureScreenState extends State<CaptureScreen>
   // Caméra live
   CameraController? _cameraController;
   List<CameraDescription>? _cameras;
-  bool _isCameraInitialized = false;
   bool _showLiveCamera = false;
 
   // Animation pulsation du viseur
   late AnimationController _scanAnimationController;
-  late Animation<double> _scanAnimation;
 
   // Détection OpenCV (cible circulaire) — on garde le résultat COMPLET
-  bool? _alignmentStatus;
   TargetDetectionResult? _targetResult; // NOUVEAU : centre + rayon de la cible
   Timer? _detectionTimer;
   bool _isAnalyzingFrame = false;
@@ -80,10 +75,6 @@ class _CaptureScreenState extends State<CaptureScreen>
       duration: const Duration(seconds: 2),
       vsync: this,
     )..repeat(reverse: true);
-
-    _scanAnimation = Tween<double>(begin: 0.8, end: 1.0).animate(
-      CurvedAnimation(parent: _scanAnimationController, curve: Curves.easeInOut),
-    );
   }
 
   @override
@@ -190,7 +181,6 @@ class _CaptureScreenState extends State<CaptureScreen>
       if (_cameraController != null) {
         await _cameraController!.dispose();
         _cameraController = null;
-        _isCameraInitialized = false;
       }
 
       _cameras = await availableCameras();
@@ -211,9 +201,7 @@ class _CaptureScreenState extends State<CaptureScreen>
         await _cameraController!.initialize();
 
         setState(() {
-          _isCameraInitialized = true;
           _showLiveCamera = true;
-          _alignmentStatus = null;
           _targetResult = null; // reset détection cible
           _parallelismData = null; // NOUVEAU : reset IMU
         });
@@ -269,16 +257,6 @@ class _CaptureScreenState extends State<CaptureScreen>
           setState(() {
             // On garde le résultat complet pour dessiner le cercle.
             _targetResult = result.success ? result : null;
-
-            if (!result.success) {
-              _alignmentStatus = null;
-            } else {
-              final bool isCentered =
-                  result.centerX > 0.25 && result.centerX < 0.75 &&
-                      result.centerY > 0.25 && result.centerY < 0.75;
-              final bool isSizedCorrectly = result.radius > 0.15;
-              _alignmentStatus = isCentered && isSizedCorrectly;
-            }
           });
         }
       } catch (e) {
@@ -298,7 +276,6 @@ class _CaptureScreenState extends State<CaptureScreen>
         _cameraController!.stopImageStream();
       }
     } catch (_) {}
-    _alignmentStatus = null;
     _targetResult = null;
   }