- SettingsView: complete UI with tabs for Accounts, Categories, Rules, Templates, Signatures, General, Appearance
- Categories: QTreeWidget with hierarchical view, color picker, parent categories
- Rules: QListWidget with RuleEditorDialog integration, toggle enabled
- Templates: QListWidget with TemplateEditorDialog integration
- Signatures: QListWidget with SignatureEditorDialog integration
- SignatureDao: full CRUD with default signature support
- common_structs.h: QColor for Category, all structs centralized
- icons.qrc: updated with Linear/Outline/Bold icons from resources
- Category: QColor instead of QString for color
- EmailTreeModel/DateGroupProxyModel: email grouping by date
- MailListView: QTreeView with date grouping combo
- ReaderView: subject frame with shadow, avatar in header, body inside header
- MainWindow: frameless with rounded corners, 1px border, edge resize, no status bar
- icons.qrc: complete icon set from resources/icons/SVG
- EmailTreeModel: hierarchical model for grouped email view (QTreeView)
- DateGroupProxyModel: proxy model for date-based grouping logic
- MailListView: migrated from QTableView to QTreeView with grouping support
- ReaderView: subject frame with shadow, avatar moved to header, body inside header
- MainWindow: frameless with rounded corners, 1px border, edge resize, no status bar
- Stability fixes for grouping mode switch:
* Proper tree cleanup (no double-delete of root)
* Bounds checking on all array accesses
* Null pointer checks in index/parent/data methods
* Date validity checks before grouping
* Index validation before accessing m_emails
- ReaderView: complete rewrite with CSS styling, headers, attachments, zoom, find, dark mode, image blocking
- Categories: DAO + UI tree widget with colors, nested categories, assignment
- Rules engine: DAO + evaluation + actions (move, mark read, flag, delete, category, forward)
- Templates: DAO + editor + manager with variables support
- Signatures: DAO + manager + auto-per-account + manual selector in compose
- ComposeView: signature combo, template selector, auto-signature on new email
- MainWindow: frameless with rounded corners, 1px border, resize from edges, no status bar
- Database: new tables (Category, MailCategory, Rule, Template, Signature) with indexes
- Added Pop3SynchronizerMailio using mailio library
- CMake option USE_MAILIO_IMAP controls both IMAP and POP3 mailio synchronizers
- Implements POP3: connect, auth (USER/PASS, XOAUTH2), LIST, RETR, DELE
- SyncFolder: fetches new messages by UID
- XOAUTH2 support for Gmail/Outlook OAuth2 tokens
- Falls back to original Pop3Synchronizer when USE_MAILIO_IMAP=OFF
- Ready to enable with: cmake -DUSE_MAILIO_IMAP=ON
- 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