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/cmake_install.cmake

@@ -1,4 +1,4 @@
-# Install script for directory: /mnt/c/Users/javie/wino-mail-dtkqt
+# Install script for directory: /mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt
 
 # Set the install prefix
 if(NOT DEFINED CMAKE_INSTALL_PREFIX)
@@ -12,7 +12,7 @@ if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
     string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
            CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
   else()
-    set(CMAKE_INSTALL_CONFIG_NAME "Release")
+    set(CMAKE_INSTALL_CONFIG_NAME "")
   endif()
   message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
 endif()
@@ -45,7 +45,7 @@ endif()
 string(REPLACE ";" "\n" CMAKE_INSTALL_MANIFEST_CONTENT
        "${CMAKE_INSTALL_MANIFEST_FILES}")
 if(CMAKE_INSTALL_LOCAL_ONLY)
-  file(WRITE "/mnt/c/Users/javie/wino-mail-dtkqt/build/install_local_manifest.txt"
+  file(WRITE "/mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/build/install_local_manifest.txt"
      "${CMAKE_INSTALL_MANIFEST_CONTENT}")
 endif()
 if(CMAKE_INSTALL_COMPONENT)
@@ -61,6 +61,6 @@ else()
 endif()
 
 if(NOT CMAKE_INSTALL_LOCAL_ONLY)
-  file(WRITE "/mnt/c/Users/javie/wino-mail-dtkqt/build/${CMAKE_INSTALL_MANIFEST}"
+  file(WRITE "/mnt/c/Users/javie/Documents/Codex/2026-08-11/revisar-2/wino-mail-dtkqt/build/${CMAKE_INSTALL_MANIFEST}"
      "${CMAKE_INSTALL_MANIFEST_CONTENT}")
 endif()