Adds `simplexName :: Maybe SimplexNameInfo` to the three records and
extends every SELECT path that reconstructs them to read the new
column. Decoded via eitherToMaybe . strDecode . encodeUtf8 (the
codebase's established pattern for Maybe Text -> typed-decode fields),
extracted as decodeSimplexName helper since the chain appears in
toContact / toContact' / toGroupInfo / toConnection. INSERT paths
still write Nothing - the write-side wiring lands in the next commit
(Task 7).
shum
e4a1acd4c9