Replace 22 manual useState + useEffect + setInterval polling with 11
focused SWR hooks. Removes ~85 lines of polling/visibility logic that
SWR handles natively. All any[] types replaced with proper interfaces
(TopPage, CountryStat, BrowserStat, etc.). Organization state in layout
typed as OrganizationMember[].
Resolves F-7, F-8, F-15 from audit report.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
