feat: responsive compact mail view + folder unread badges

- CompactMailDelegate: card-based view for narrow panels (<420px)
  * Avatar with hash-based color, sender + date (relative format)
  * Subject line with attachment icon
  * Action buttons: flag, delete, category, more (context menu)
  * Unread highlight with light blue background + bold sender
- MailListView: automatic switch between tree/table (wide) and list/cards (narrow)
  * QStackedWidget with QTreeView + QListView sharing same proxy model
  * resizeEvent threshold at 420px
  * Signals forwarded to MainMainWindow for actions
- FolderTreeDelegate: custom paint for folder tree
  * Unread count badge (blue pill) right-aligned on folder nodes
  * Account nodes bold, folder nodes normal weight
  * Proper indentation per depth level
- MailItemDao::countUnreadByFolderId() for real-time unread counts
- MainMainWindow handlers for compact actions (flag, delete, category, more menu)

build/.qt/QtDeploySupport.cmake

@@ -35,12 +35,12 @@ set(__QT_DEPLOY_SYSTEM_NAME "Linux")
 set(__QT_DEPLOY_SHARED_LIBRARY_SUFFIX ".so")
 set(__QT_DEPLOY_IS_SHARED_LIBS_BUILD "ON")
 set(__QT_DEPLOY_TOOL "GRD")
-set(__QT_DEPLOY_IMPL_DIR "/mnt/c/Users/javie/wino-mail-dtkqt/build/.qt")
+set(__QT_DEPLOY_IMPL_DIR "/mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/build/.qt")
 set(__QT_DEPLOY_VERBOSE "")
 set(__QT_CMAKE_EXPORT_NAMESPACE "Qt6")
 set(__QT_LIBINFIX "")
 set(__QT_DEPLOY_GENERATOR_IS_MULTI_CONFIG "0")
-set(__QT_DEPLOY_ACTIVE_CONFIG "Release")
+set(__QT_DEPLOY_ACTIVE_CONFIG "")
 set(__QT_NO_CREATE_VERSIONLESS_FUNCTIONS "")
 set(__QT_DEFAULT_MAJOR_VERSION "6")
 set(__QT_DEPLOY_QT_ADDITIONAL_PACKAGES_PREFIX_PATH "")
@@ -60,7 +60,7 @@ set(__QT_DEPLOY_QT_DEBUG_POSTFIX "")
 
 # Define the CMake commands to be made available during deployment.
 set(__qt_deploy_support_files
-    "/mnt/c/Users/javie/wino-mail-dtkqt/build/.qt/QtDeployTargets.cmake"
+    "/mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/build/.qt/QtDeployTargets.cmake"
     "/usr/lib/x86_64-linux-gnu/cmake/Qt6Core/Qt6CoreDeploySupport.cmake"
 )
 foreach(__qt_deploy_support_file IN LISTS __qt_deploy_support_files)