Replace outer div.connections-page wrapper and explicit PageHeader with
PageShell component. Update connections-mobile-auth snapshot to match
the stable full-suite render state (filter bar absent when test admin
has no cooperative topics configured).
Add PLAYWRIGHT_PORT env var to playwright.config.js so a worktree can run
its own dev server on a different port without disrupting the main dev
server. Rebaseline connections-mobile-auth which had drifted from the
suggestions data state captured during Phase 1.
Add about to authenticatedMobilePages to capture an authenticated baseline
needed for regression detection during the Phase 3.5 about.vue migration.
Rename all auth-mobile snapshots from *-mobile to *-mobile-auth to avoid
name collision with the public loop's about-mobile snapshot.
