- Added destructor definitions (= default) to all classes that had them declared in header but not defined - Fixes 'undefined reference to destructor' linker errors across 30+ classes - Covers services, UI components, and synchronizers
- ImapSynchronizer::syncFolder(): detecta eliminados (UIDs locales no en servidor), fetch nuevos (sinceUid), actualiza flags (FLAGS batch) - fetchAllUids(): SELECT + SEARCH ALL para lista completa UIDs servidor - parseAndUpdateFlags(): FETCH FLAGS en lotes 100, update DB si cambió read/flagged - AccountSetupDialog: integra ConnectionWizard para IMAP/POP3 con test de conexión real - IMAP FETCH parser robusto: logging respuesta servidor + fallback UID-by-UID - Fix: FETCH failed logging muestra first/last UID + respuesta truncada