* fix(branding): add SuperAdmin-only notice on upgrade gates
Some upgrade prompts (Kanban paywall, group creation form, group-disabled
banner in conversation view) are rendered only to SuperAdmins and link to
fazer.ai. Admins viewing those screens were worried that the fazer.ai
link was also being shown to their agents, even though it is not.
Add a discreet "Only system administrators can see this message" line
under each SuperAdmin-only block to make the audience explicit.
* fix(branding): inline SuperAdmin notice into Banner component
The notice was being rendered as a standalone <p> below the conversation
banner, which made it easy to miss. Add an optional noticeMessage prop
to the Banner component and render it inside the banner with italic +
reduced opacity styling, then pass it from the groups-disabled branch
of the MessagesView banner.
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