fix(scope-group-mgmt): show all members when group matched by name

[qiyundai]

Summary

• Searching a group by name would show the group in the list but expanding it displayed "No members match your search" — because the same query was applied to filter the member list, and users don't have the group name in their fields
• Fixed with smart filtering: when the group itself matches the query (by name or description), all members are shown on expand; user filtering is only applied when the group surfaced via a member match
• Also adds a defensive empty-string guard to groupMetaMatchesQuery, making it consistent with the parallel userMatchesQuery helper

Behavior change

Search term	Before	After
Group name (e.g. "Admins")	Expand → "No members match your search"	Expand → all members visible
User name/email (e.g. "alice")	Matching user shown only	Matching user shown only (unchanged)

Test plan

• Search a group by its exact name → expand → all members visible
• Search a user by name/email → matching group auto-expands → only that user visible
• Clear search → all groups shown, expand shows all members
• npm run check passes

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