feat: mailio-based IMAP synchronizer (option USE_MAILIO_IMAP)

- Added ImapSynchronizerMailio using mailio library (C++17, Boost)
- CMake option USE_MAILIO_IMAP (OFF by default) to avoid Boost dependency
- Fetches Boost + mailio via FetchContent when enabled
- Implements full IMAP: connect, auth (LOGIN/XOAUTH2), LIST, SELECT, FETCH, STORE, APPEND, EXPUNGE
- SyncFolder: detects deletions, fetches new messages, updates flags in batches
- XOAUTH2 support for Gmail/Outlook OAuth2 tokens
- Falls back to original ImapSynchronizer when USE_MAILIO_IMAP=OFF
- Ready to enable with: cmake -DUSE_MAILIO_IMAP=ON

CMakeLists.txt

@@ -4,6 +4,31 @@ project(WinoMailQt VERSION 1.0.0 LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+# FetchContent for mailio (C++ email library)
+include(FetchContent)
+
+# Option to use mailio-based IMAP (OFF by default to avoid Boost dependency issues)
+option(USE_MAILIO_IMAP "Use mailio-based IMAP synchronizer (requires Boost)" OFF)
+
+if (USE_MAILIO_IMAP)
+    # Fetch Boost first (required by mailio)
+    FetchContent_Declare(
+        Boost
+        GIT_REPOSITORY https://github.com/boostorg/boost.git
+        GIT_TAG        boost-1.85.0
+        GIT_SHALLOW    TRUE
+    )
+    FetchContent_MakeAvailable(Boost)
+
+    FetchContent_Declare(
+        mailio
+        GIT_REPOSITORY https://github.com/karastojko/mailio
+        GIT_TAG        master
+        GIT_SHALLOW    TRUE
+    )
+    FetchContent_MakeAvailable(mailio)
+endif()
+
 find_package(Qt6 COMPONENTS Core Gui Widgets Network Sql Test Concurrent REQUIRED)
 
 set(CMAKE_AUTOMOC ON)
@@ -48,6 +73,7 @@ set(SRC_FILES
     src/services/folderservice.cpp
     src/services/synchronizer.cpp
     src/services/imap/imapsynchronizer.cpp
+    src/services/imap/imapconnection.cpp
     src/services/outlook/outlooksynchronizer.cpp
     src/services/gmail/gmailsynchronizer.cpp
     src/services/pop3/pop3synchronizer.cpp
@@ -81,6 +107,8 @@ set(SRC_FILES
     src/ui/maillistview.h
     src/ui/composeview.cpp
     src/ui/composeview.h
+    src/ui/richtexteditor.cpp
+    src/ui/richtexteditor.h
     src/ui/settingsview.cpp
     src/ui/settingsview.h
     src/ui/contactsview.cpp
@@ -95,8 +123,32 @@ set(SRC_FILES
     thirdparty/tags/src/config.cpp
     ${TAG_MOCS}
 )
+
+if (USE_MAILIO_IMAP)
+    list(APPEND SRC_FILES
+        src/services/imap/imapsynchronizer_mailio.cpp
+    )
+endif()
 # Executable
-add_executable(wino-mail-qt ${SRC_FILES})
+add_executable(wino-mail-qt ${SRC_FILES}
+    icons.qrc
+)
 
 # Link Qt
 target_link_libraries(wino-mail-qt PRIVATE Qt6::Core Qt6::Gui Qt6::Widgets Qt6::Network Qt6::Sql Qt6::Concurrent)
+if (WIN32)
+    target_link_libraries(wino-mail-qt PRIVATE crypt32)
+endif()
+
+if (USE_MAILIO_IMAP)
+    target_link_libraries(wino-mail-qt PRIVATE mailio::mailio)
+endif()
+
+enable_testing()
+add_executable(test_mimestorage
+    tests/unit/test_mimestorage.cpp
+    src/core/mailitem.cpp
+    src/services/mimestorage.cpp
+)
+target_link_libraries(test_mimestorage PRIVATE Qt6::Core Qt6::Test)
+add_test(NAME test_mimestorage COMMAND test_mimestorage)