style: fix lint across client packages

eslint --fix autofixes plus manual repairs: max-len line splits
(fake-api handlers, notifier/slots JSDoc, spec signatures), charAt over
non-null-asserted indexing in slash detect/menu cores, Array.from for
code-point capping, typeof assertions for unbound-method in specs,
generic getByRole for the send-button cast, effect disposer void-wrap in
command register, and dropped unused type imports.

scripts/gen-doc-graphs.ts

@@ -703,7 +703,7 @@ class EventRelationCollector {
           const eventNames = this.eventNamesFromCall(node, receiverKind)
           if (method === 'on' || method === 'once') {
             for (const event of eventNames) this.ensure(event).listeners.add(source.pkg)
-          } else if (method === 'emit' || method === 'parallel' || method === 'serial' || method === 'waterfall') {
+          } else if (method === 'emit' || method === 'parallel' || method === 'serial' || method === 'waterfall' || method === 'bail') {
             for (const event of eventNames) this.addDispatcher(event, source.pkg, method)
           }
         }