tui: add reload functionality and improve lazy utility with reset capability

packages/opencode/src/util/lazy.ts

@@ -2,10 +2,17 @@ export function lazy<T>(fn: () => T) {
   let value: T | undefined
   let loaded = false
 
-  return (): T => {
+  const result = (): T => {
     if (loaded) return value as T
     loaded = true
     value = fn()
     return value as T
   }
+
+  result.reset = () => {
+    loaded = false
+    value = undefined
+  }
+
+  return result
 }