* test(app/e2e): sidebar query pause + mobile open/close transition (Cluster G6)
G6.1: assert fetch_workspaces_request stops being sent when desktop sidebar
is closed (CDP WebSocket frame counting, no store injection).
G6.2: assert mobile sidebar panel animates in/out at 390×844 viewport via
toBeInViewport on translateX-animated element.
Adds installWorkspaceFetchMonitor, expectWorkspaceListSubscribed,
closeSidebar, openMobileAgentSidebar, closeMobileAgentSidebar,
expectMobileAgentSidebarVisible, and expectMobileAgentSidebarHidden helpers.
* test(app/e2e): mobile sidebar open/close transition (Cluster G6)
G6.1 (query-pause perf invariant) reclassified as a unit-test follow-up
— counting internal RPC frames in E2E is banned per updated roadmap.
G6.2: asserts mobile sidebar panel animates in/out at 390×844 viewport
via toBeInViewport on the translateX-animated sidebar-sessions element.
Adds openMobileAgentSidebar, closeMobileAgentSidebar,
expectMobileAgentSidebarVisible, and expectMobileAgentSidebarHidden helpers.