fix: adress pr comments

libs/types/src/index.ts

@@ -292,3 +292,7 @@ export type {
   EventReplayHookResult,
 } from './event-history.js';
 export { EVENT_HISTORY_VERSION, DEFAULT_EVENT_HISTORY_INDEX } from './event-history.js';
+
+// Worktree and PR types
+export type { PRState, WorktreePRInfo } from './worktree.js';
+export { PR_STATES, validatePRState } from './worktree.js';

libs/types/src/worktree.ts

@@ -0,0 +1,32 @@
+/**
+ * Worktree and PR-related types
+ * Shared across server and UI components
+ */
+
+/** GitHub PR states as returned by the GitHub API (uppercase) */
+export type PRState = 'OPEN' | 'MERGED' | 'CLOSED';
+
+/** Valid PR states for validation */
+export const PR_STATES: readonly PRState[] = ['OPEN', 'MERGED', 'CLOSED'] as const;
+
+/**
+ * Validates a PR state value from external APIs (e.g., GitHub CLI).
+ * Returns the validated state if it matches a known PRState, otherwise returns 'OPEN' as default.
+ * This is safer than type assertions as it handles unexpected values from external APIs.
+ *
+ * @param state - The state string to validate (can be any string)
+ * @returns A valid PRState value
+ */
+export function validatePRState(state: string | undefined | null): PRState {
+  return PR_STATES.find((s) => s === state) ?? 'OPEN';
+}
+
+/** PR information stored in worktree metadata */
+export interface WorktreePRInfo {
+  number: number;
+  url: string;
+  title: string;
+  /** PR state: OPEN, MERGED, or CLOSED */
+  state: PRState;
+  createdAt: string;
+}