ChatPane still suspends the route boundary on initial mount (residual #440 shape)

[omridevk]

Some body-scope read outside the two inner Suspense islands (apps/conciv/src/pane/chat-pane.tsx:326, :378) still suspends the route Match boundary during initial pane mount, rendering the whole subtree off-document until the slowest pane query resolves. The focus race is now immune (#437, 2d2581a registers the composer handle from a pane-body effect), but pushing that read into an island would remove the off-document render window for the whole class. Restructure, not a patch — both #437 RCA agents independently confirmed the detached-root window with instrumented traces.

🤖 Generated with Claude Code

[omridevk]

Live confirmation from #457: gating thread content on a createResource read inside the inner Suspense island still got captured by the route Match boundary on initial mount — whole widget rendered off-document until the history snapshot arrived, skeleton fallback never painted. Reworked to a plain signal + Show in 083c6c9 to sidestep it. Evidence the restructure here has user-visible payoff: any future Suspense use inside ChatPane hits this.