Bots filed before sectionName existed carry only sectionId in their profile
ui_meta. The creating desktop knows the section record but never wrote the
name back, so a second desktop on the same gateway had nothing to rebuild
the section from and still drew a flat list.
backfillBotSectionNames runs beside adoptBotSectionsFromMeta in the roster
pane effect: members whose sectionId matches a locally known section but
have no sectionName are re-stamped through moveBotsToSection (one write per
profile, sequential). Once written the name is present, so it is a one-time
pass per member. Sections nobody here knows are left alone.
Docs no longer tell users to re-file or rename to stamp the name.
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