Workspace creation landed on the setup tab because openTab implicitly
focused the tab it opened, and the setup auto-open effect ran after
the setup dialog's navigation, stomping on the agent tab's focus.
Split the store API into explicit openTabFocused and openTabInBackground
so every caller declares intent. The setup auto-open effect now opens in
background and no longer steals focus; user-intent call sites (sidebar,
kebab menus, file explorer, terminal creation, prepareWorkspaceTab)
use openTabFocused and drop the redundant paired focusTab call.
When bulk-closing tabs (e.g. "Close to the left"), the reconciliation
useEffect would re-add tabs for still-active agents before the server
archived them, causing tabs to flicker back then disappear one by one.
Adds hiddenAgentIdsByWorkspace as the inverse of pinnedAgentIds: a
local, in-memory-only override that prevents reconciliation from
re-opening tabs for agents the user just closed. Hidden intent is
automatically cleared when explicitly opening, retargeting, or pinning
an agent tab.
Mohamed Boudra