New features

• Internal PGP engine (gpmInternal): full OpenPGP without GnuPG — Ed25519, ECDSA, ECDH, RSA, AES-256
• PGP key server support: HKP/HKPS and WKD (Web Key Directory) with auto-fetch on encrypt/verify
• PGP Subject protection (ProtectSubject) — encrypts Subject inside PGP/MIME and S/MIME messages
• Theme switching added to Options → Preferences (light/dark/auto/by time)
• Color groups: configurable background opacity and corner mark indicator
• Message Subject is now shown in the taskbar while composing
• Draft crypto state (sign/encrypt/engine/PGP-MIME) now persists via X-Bat-Draft-Security header; reopening a draft restores the user's intent
• Sending a draft with pending crypto from the "Outbox" now prompts: perform crypto now, send as-is, or cancel
• PGP key properties dialog redesigned: HTML/CSS rendering, resizable form with size persistence, dark-theme aware
• Added backup file integrity verification to ensure created backup files are fully restorable

Improvements

• Improved Microsoft Word-like sticky font/size persistence when navigating adjacent to formatted text in the HTML editor
• 0002296: Added mouse wheel scrolling in the emoji picker
• Added full interface translation updates for Bulgarian, Finnish, Italian, and Serbian, fixing many missing translations across various menus

Fixes

• Fixed an issue with an invisible caret while typing in the HTML editor
• Fixed quote splitting in the HTML editor
• Fixed Ctrl+A not working in header fields
• Fixed an issue with mouse-based field selection in message headers
• Fixed an issue where adding spaces in Quick Reply (Conversation View) was not possible
• Fixed importing of MIME From headers and folder names with national characters from Outlook
• Fixed an issue with the Description field when importing calendar events