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/CMakeFiles/test_mimestorage_autogen_timestamp_deps.dir/DependInfo.cmake

@@ -0,0 +1,22 @@
+
+# Consider dependencies only in project.
+set(CMAKE_DEPENDS_IN_PROJECT_ONLY OFF)
+
+# The set of languages for which implicit dependencies are needed:
+set(CMAKE_DEPENDS_LANGUAGES
+  )
+
+# The set of dependency files which are needed:
+set(CMAKE_DEPENDS_DEPENDENCY_FILES
+  )
+
+# Targets to which this target links which contain Fortran sources.
+set(CMAKE_Fortran_TARGET_LINKED_INFO_FILES
+  )
+
+# Targets to which this target links which contain Fortran sources.
+set(CMAKE_Fortran_TARGET_FORWARD_LINKED_INFO_FILES
+  )
+
+# Fortran module output directory.
+set(CMAKE_Fortran_TARGET_MODULE_DIR "")