v0.2.28_fix

docs/IMPLEMENTATION_STATUS.md

@@ -6,7 +6,7 @@ This file tracks the `0.2.28` source snapshot. Storage/search scope and outstand
 ## 0.2.28 thread replies and legacy Polish mail decoding
 
 - Reply composition detects all configured account/identity addresses; replying to an own sent message selects the first non-own recipient and Reply all keeps the remaining external participants.
-- The reader toolbar toggles the existing `thread_mode` mailbox preference between threaded and flat/single-message presentation.
+- The mailbox toolbar toggles the existing `thread_mode` preference between a grouped thread list and a flat message list. Thread groups use Message-ID/In-Reply-To/References metadata, can be expanded/collapsed, and the reader follows the same preference.
 - Header/body rendering repairs common Polish mojibake while retaining RFC 2047 charset decoding; cached summaries/details are normalized on output so old cached rows benefit without a schema migration.
 
 ## 0.2.27 mail-list and appearance polish