First step of splitting the 4.3k-line tabs.js monolith into per-tab
modules. The live agent roster (containersState) is the one piece of
genuinely cross-domain state — read by the container tree, the
capabilities + tool-group matrices, the schedule target-chips, the
container-load poll, the selection bar and the operator inbox. Move it
(and its snapshot-sync) into a new dashboard/state.js that each domain
module imports, so the upcoming per-tab extractions have a single source
of truth to depend on instead of a shared IIFE closure.
Minimal by design — only the roster moves; the container row cache and
the apply-handlers (which also re-render) stay with the container domain.
Behaviour-preserving: the imported Map is mutated in place exactly as
before. esbuild inlines state.js into the existing tabs.js bundle, so the
static output is unchanged. Build green.
59054b1f57