refactor(tui): centralize active location

packages/tui/src/context/location.tsx

@@ -1,14 +1,24 @@
 import type { LocationRef } from "@opencode-ai/client"
-import { createContext, useContext, type Accessor, type ParentProps } from "solid-js"
+import { createContext, createSignal, useContext, type Accessor, type ParentProps, type Setter } from "solid-js"
 
-const context = createContext<Accessor<LocationRef | undefined>>()
+const context = createContext<{
+  current: Accessor<LocationRef | undefined>
+  set: Setter<LocationRef | undefined>
+}>()
 
-export function LocationProvider(props: ParentProps<{ location?: LocationRef }>) {
-  return <context.Provider value={() => props.location}>{props.children}</context.Provider>
+export function LocationProvider(props: ParentProps) {
+  const [current, set] = createSignal<LocationRef>()
+  return <context.Provider value={{ current, set }}>{props.children}</context.Provider>
 }
 
 export function useLocation() {
   const value = useContext(context)
   if (!value) throw new Error("Location context must be used within a LocationProvider")
-  return value
+  return value.current
+}
+
+export function useSetLocation() {
+  const value = useContext(context)
+  if (!value) throw new Error("Location context must be used within a LocationProvider")
+  return value.set
 }