style: doppelte Unterstriche in Closure-Parametern bereinigen

Dart 3 erlaubt mehrere Wildcard-Parameter mit demselben Namen "_" in
einem Scope, daher sind __ / ___ für ungenutzte Callback-Parameter
(pageBuilder, errorBuilder etc.) unnötig. Rein mechanische Änderung,
keine Verhaltensänderung.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

lib/features/call/voice_channel.dart

@@ -689,7 +689,7 @@ class _ParticipantStrip extends StatelessWidget {
     return ListView.separated(
       scrollDirection: isVertical ? Axis.vertical : Axis.horizontal,
       itemCount: participants.length,
-      separatorBuilder: (_, __) => const SizedBox(width: 12, height: 12),
+      separatorBuilder: (_, _) => const SizedBox(width: 12, height: 12),
       itemBuilder: (context, i) => SizedBox(
         width: isVertical ? double.infinity : 101 * participants[i].aspectRatio,
         height: 101,

lib/features/chat/attachment_dialog.dart

@@ -30,9 +30,9 @@ class AttachmentDialog extends StatefulWidget {
           barrierLabel: 'Anhang',
           barrierColor: Colors.black54,
           transitionDuration: const Duration(milliseconds: 180),
-          pageBuilder: (_, __, ___) =>
+          pageBuilder: (_, _, _) =>
               AttachmentDialog(files: files, room: room, replyTo: replyTo),
-          transitionBuilder: (_, anim, __, child) {
+          transitionBuilder: (_, anim, _, child) {
             final curved =
                 CurvedAnimation(parent: anim, curve: Curves.easeOutBack);
             return FadeTransition(

lib/features/chat/document_viewer.dart

@@ -734,9 +734,9 @@ class _PdfFullscreenViewer extends StatefulWidget {
       opaque: true,
       barrierColor: Colors.black,
       transitionDuration: const Duration(milliseconds: 180),
-      pageBuilder: (_, __, ___) =>
+      pageBuilder: (_, _, _) =>
           _PdfFullscreenViewer(bytes: bytes, filename: filename, initialPage: initialPage),
-      transitionsBuilder: (_, anim, __, child) => FadeTransition(opacity: anim, child: child),
+      transitionsBuilder: (_, anim, _, child) => FadeTransition(opacity: anim, child: child),
     ));
   }
 

lib/features/chat/gif_sticker_picker.dart

@@ -538,7 +538,7 @@ class _GifStickerPickerState extends State<GifStickerPicker>
             child: Image.network(
               thumbUrl,
               fit: BoxFit.contain,
-              errorBuilder: (_, __, ___) => Container(color: _pt!.bg2),
+              errorBuilder: (_, _, _) => Container(color: _pt!.bg2),
             ),
           ),
         );
@@ -587,7 +587,7 @@ class _StickerCellState extends State<_StickerCell> {
               Image.network(
                 widget.piUrl,
                 fit: BoxFit.contain,
-                errorBuilder: (_, __, ___) => Container(color: pt.bg2),
+                errorBuilder: (_, _, _) => Container(color: pt.bg2),
               ),
               if (showOverlay)
                 Positioned(
@@ -666,7 +666,7 @@ class _GifCell extends StatelessWidget {
             fit: StackFit.expand,
             children: [
               Image.network(imageUrl, fit: BoxFit.cover,
-                errorBuilder: (_, __, ___) => Container(color: PyramidTheme.of(context).bg3)),
+                errorBuilder: (_, _, _) => Container(color: PyramidTheme.of(context).bg3)),
               if (isHovered || isFavorite)
                 Positioned(
                   top: 4, right: 4,

lib/widgets/mxc_image.dart

@@ -90,7 +90,7 @@ class _MxcAvatarState extends State<MxcAvatar> {
               width: widget.size,
               height: widget.size,
               fit: BoxFit.cover,
-              errorBuilder: (_, __, ___) => widget.placeholder(context),
+              errorBuilder: (_, _, _) => widget.placeholder(context),
             ),
           );
         }
@@ -194,7 +194,7 @@ class _MxcImageState extends State<MxcImage> {
             width: widget.width,
             height: widget.height,
             gaplessPlayback: true,
-            errorBuilder: (_, __, ___) =>
+            errorBuilder: (_, _, _) =>
                 widget.placeholder ?? const SizedBox.shrink(),
           );
         }

lib/widgets/pyramid_loader.dart

@@ -60,7 +60,7 @@ class _PyramidLoaderState extends State<PyramidLoader>
 
     final painter = AnimatedBuilder(
       animation: _ctrl,
-      builder: (_, __) => CustomPaint(
+      builder: (_, _) => CustomPaint(
         painter: _PyramidPainter(
           yaw: _yawAt(_ctrl.value),
           accent: accent,
@@ -82,7 +82,7 @@ class _PyramidLoaderState extends State<PyramidLoader>
               fit: BoxFit.contain,
               repeat: true,
               animate: true,
-              errorBuilder: (_, __, ___) => painter,
+              errorBuilder: (_, _, _) => painter,
             ),
           ),
         ),

lib/widgets/search_modal.dart

@@ -723,7 +723,7 @@ class _SearchThumbState extends State<_SearchThumb> {
         height: size,
         child: _bytes != null
             ? Image.memory(_bytes!, fit: BoxFit.cover,
-                errorBuilder: (_, __, ___) => _placeholder(pt))
+                errorBuilder: (_, _, _) => _placeholder(pt))
             : _placeholder(pt),
       ),
     );

lib/widgets/settings_modal.dart

@@ -1306,7 +1306,7 @@ class _ProfileSectionState extends ConsumerState<_ProfileSection> {
                       children: [
                         if (_pendingServerBanner != null)
                           Image.memory(_pendingServerBanner!, fit: BoxFit.cover,
-                              errorBuilder: (_, __, ___) => const SizedBox.shrink())
+                              errorBuilder: (_, _, _) => const SizedBox.shrink())
                         else if (existingMxc != null && client != null)
                           MxcImage(mxcUri: existingMxc, client: client, fit: BoxFit.cover)
                         else

lib/widgets/share_target_dialog.dart

@@ -27,8 +27,8 @@ class ShareTargetDialog {
       barrierLabel: 'Teilen',
       barrierColor: Colors.black54,
       transitionDuration: const Duration(milliseconds: 180),
-      pageBuilder: (_, __, ___) => _ShareTargetPicker(client: client, share: share),
-      transitionBuilder: (_, anim, __, child) {
+      pageBuilder: (_, _, _) => _ShareTargetPicker(client: client, share: share),
+      transitionBuilder: (_, anim, _, child) {
         final curved = CurvedAnimation(parent: anim, curve: Curves.easeOutBack);
         return FadeTransition(
           opacity: anim,