feat: Wino-style compact mail view with display modes + hover actions

- CompactMailDelegate: 3 display modes (Compact/Medium/Spacious) like WinUI original
  * Compact: 64px, minimal, no preview
  * Medium: 96px, with preview, detailed categories
  * Spacious: 120px, full padding, preview visible
- Hover actions: Reply (↩), Forward (↪), Mark unread (✎) on right side
- Unread dot indicator (top-right, blue) like WinUI
- User-configurable display mode via combo box in filter bar
- MainMainWindow handlers for reply/forward/mark-unread from compact view
- Signals: replyRequested, forwardRequested, markUnreadRequested

build/CMakeFiles/wino-mail-qt.dir/compiler_depend.internal

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- /usr/include/x86_64-linux-gnu/qt6/QtCore/qitemselectionmodel.h
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@@ -27259,6 +27258,7 @@ CMakeFiles/wino-mail-qt.dir/src/ui/delegates/CompactMailDelegate.cpp.o
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  /usr/include/x86_64-linux-gnu/qt6/QtCore/qyieldcpu.h
  /usr/include/x86_64-linux-gnu/qt6/QtGui/QColor
+ /usr/include/x86_64-linux-gnu/qt6/QtGui/QCursor
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  /usr/include/x86_64-linux-gnu/qt6/QtGui/QMouseEvent
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@@ -27310,18 +27310,14 @@ CMakeFiles/wino-mail-qt.dir/src/ui/delegates/CompactMailDelegate.cpp.o
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- /usr/include/x86_64-linux-gnu/qt6/QtWidgets/QListView
  /usr/include/x86_64-linux-gnu/qt6/QtWidgets/QStyle
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- /usr/include/x86_64-linux-gnu/qt6/QtWidgets/qabstractitemview.h
- /usr/include/x86_64-linux-gnu/qt6/QtWidgets/qabstractscrollarea.h
  /usr/include/x86_64-linux-gnu/qt6/QtWidgets/qabstractslider.h
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- /usr/include/x86_64-linux-gnu/qt6/QtWidgets/qlistview.h
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  /usr/include/x86_64-linux-gnu/qt6/QtWidgets/qsizepolicy.h
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@@ -30993,9 +30989,11 @@ CMakeFiles/wino-mail-qt.dir/src/ui/models/FolderListModel.cpp.o
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  /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/src/core/authenticator.h
  /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/src/core/models/account.h
+ /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/src/core/mailitem.h
  /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/src/core/models/folder.h
  /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/src/db/databasemanager.h
  /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/src/db/dao/folderdao.h
+ /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/src/db/dao/mailitemdao.h
  /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/src/services/accountservice.h
  /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/src/ui/models/FolderListModel.h
  /usr/include/alloca.h
@@ -41987,6 +41985,8 @@ wino-mail-qt
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+ /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/build/CMakeFiles/wino-mail-qt.dir/src/ui/delegates/CompactMailDelegate.cpp.o
+ /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/build/CMakeFiles/wino-mail-qt.dir/src/ui/delegates/FolderTreeDelegate.cpp.o
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