fix: UI polish — popover dismiss, settings layout, default view

chore: rename all internal Swift references from OpenOats to Yap

chore: rename all directories and package to Yap

chore: rename to Yap (user-facing strings)

docs(phase-06): complete final phase execution

docs(06-01): complete search implementation plan

feat(06-01): wire .searchable and debounce into MeetingSidebarView

feat(06-01): implement SearchService actor

docs(06-02): complete PDF export plan

feat(06-02): add Export PDF button to PastMeetingDetailView

test(06-01): add failing tests for SearchService actor

feat(06-02): create PDFExporter struct

docs(phase-6): research + validation + plans (2 plans, 1 wave parallel)

docs(06-search-export): create phase plan

docs(06): research phase search-export