feat: enhance PR handling and UI integration for worktrees

- Added a new route for fetching PR info, allowing users to retrieve details about existing pull requests associated with worktrees.
- Updated the create PR handler to store metadata for existing PRs and handle cases where a PR already exists.
- Enhanced the UI components to display PR information, including a new button to address PR comments directly from the worktree panel.
- Improved the overall user experience by integrating PR state indicators and ensuring seamless interaction with the GitHub CLI for PR management.

apps/server/src/lib/worktree-metadata.ts

@@ -0,0 +1,154 @@
+/**
+ * Worktree metadata storage utilities
+ * Stores worktree-specific data in .automaker/worktrees/:branch/worktree.json
+ */
+
+import * as fs from "fs/promises";
+import * as path from "path";
+
+export interface WorktreePRInfo {
+  number: number;
+  url: string;
+  title: string;
+  state: string;
+  createdAt: string;
+}
+
+export interface WorktreeMetadata {
+  branch: string;
+  createdAt: string;
+  pr?: WorktreePRInfo;
+}
+
+/**
+ * Get the path to the worktree metadata directory
+ */
+function getWorktreeMetadataDir(projectPath: string, branch: string): string {
+  // Sanitize branch name for filesystem (replace / with -)
+  const safeBranch = branch.replace(/\//g, "-");
+  return path.join(projectPath, ".automaker", "worktrees", safeBranch);
+}
+
+/**
+ * Get the path to the worktree metadata file
+ */
+function getWorktreeMetadataPath(projectPath: string, branch: string): string {
+  return path.join(getWorktreeMetadataDir(projectPath, branch), "worktree.json");
+}
+
+/**
+ * Read worktree metadata for a branch
+ */
+export async function readWorktreeMetadata(
+  projectPath: string,
+  branch: string
+): Promise<WorktreeMetadata | null> {
+  try {
+    const metadataPath = getWorktreeMetadataPath(projectPath, branch);
+    const content = await fs.readFile(metadataPath, "utf-8");
+    return JSON.parse(content) as WorktreeMetadata;
+  } catch (error) {
+    // File doesn't exist or can't be read
+    return null;
+  }
+}
+
+/**
+ * Write worktree metadata for a branch
+ */
+export async function writeWorktreeMetadata(
+  projectPath: string,
+  branch: string,
+  metadata: WorktreeMetadata
+): Promise<void> {
+  const metadataDir = getWorktreeMetadataDir(projectPath, branch);
+  const metadataPath = getWorktreeMetadataPath(projectPath, branch);
+
+  // Ensure directory exists
+  await fs.mkdir(metadataDir, { recursive: true });
+
+  // Write metadata
+  await fs.writeFile(metadataPath, JSON.stringify(metadata, null, 2), "utf-8");
+}
+
+/**
+ * Update PR info in worktree metadata
+ */
+export async function updateWorktreePRInfo(
+  projectPath: string,
+  branch: string,
+  prInfo: WorktreePRInfo
+): Promise<void> {
+  // Read existing metadata or create new
+  let metadata = await readWorktreeMetadata(projectPath, branch);
+
+  if (!metadata) {
+    metadata = {
+      branch,
+      createdAt: new Date().toISOString(),
+    };
+  }
+
+  // Update PR info
+  metadata.pr = prInfo;
+
+  // Write back
+  await writeWorktreeMetadata(projectPath, branch, metadata);
+}
+
+/**
+ * Get PR info for a branch from metadata
+ */
+export async function getWorktreePRInfo(
+  projectPath: string,
+  branch: string
+): Promise<WorktreePRInfo | null> {
+  const metadata = await readWorktreeMetadata(projectPath, branch);
+  return metadata?.pr || null;
+}
+
+/**
+ * Read all worktree metadata for a project
+ */
+export async function readAllWorktreeMetadata(
+  projectPath: string
+): Promise<Map<string, WorktreeMetadata>> {
+  const result = new Map<string, WorktreeMetadata>();
+  const worktreesDir = path.join(projectPath, ".automaker", "worktrees");
+
+  try {
+    const dirs = await fs.readdir(worktreesDir, { withFileTypes: true });
+
+    for (const dir of dirs) {
+      if (dir.isDirectory()) {
+        const metadataPath = path.join(worktreesDir, dir.name, "worktree.json");
+        try {
+          const content = await fs.readFile(metadataPath, "utf-8");
+          const metadata = JSON.parse(content) as WorktreeMetadata;
+          result.set(metadata.branch, metadata);
+        } catch {
+          // Skip if file doesn't exist or can't be read
+        }
+      }
+    }
+  } catch {
+    // Directory doesn't exist
+  }
+
+  return result;
+}
+
+/**
+ * Delete worktree metadata for a branch
+ */
+export async function deleteWorktreeMetadata(
+  projectPath: string,
+  branch: string
+): Promise<void> {
+  const metadataDir = getWorktreeMetadataDir(projectPath, branch);
+  try {
+    await fs.rm(metadataDir, { recursive: true, force: true });
+  } catch {
+    // Ignore errors if directory doesn't exist
+  }
+}