tui: add session search functionality with debounced input and server-side filtering

packages/opencode/src/cli/cmd/tui/util/signal.ts

@@ -0,0 +1,7 @@
+import { createSignal, type Accessor } from "solid-js"
+import { debounce, type Scheduled } from "@solid-primitives/scheduled"
+
+export function createDebouncedSignal<T>(value: T, ms: number): [Accessor<T>, Scheduled<[value: T]>] {
+  const [get, set] = createSignal(value)
+  return [get, debounce((v: T) => set(() => v), ms)]
+}