fix: add missing import and update tests for branch template feature (#799)

* fix: add missing import and update tests for branch template feature

- Add missing `import { $ } from 'bun'` in branch.ts
- Add missing `labels` property to pull-request-target.test.ts fixture
- Update branch-template tests to expect 5-word descriptions

* address review feedback: update comment and add truncation test

src/github/operations/branch.ts

@@ -6,6 +6,7 @@
  * - For Issues: Create a new branch
  */
 
+import { $ } from "bun";
 import { execFileSync } from "child_process";
 import * as core from "@actions/core";
 import type { ParsedGitHubContext } from "../context";

src/utils/branch-template.ts

@@ -7,9 +7,12 @@
 const NUM_DESCRIPTION_WORDS = 5;
 
 /**
- * Extracts the first `numWords` words from a title and converts them to kebab-case
+ * Extracts the first 5 words from a title and converts them to kebab-case
  */
-function extractDescription(title: string, numWords: number = NUM_DESCRIPTION_WORDS): string {
+function extractDescription(
+  title: string,
+  numWords: number = NUM_DESCRIPTION_WORDS,
+): string {
   if (!title || title.trim() === "") {
     return "";
   }