chore(gitignore): ignore JavaScript sourcemap files

Add *.map pattern to .gitignore to exclude JavaScript sourcemap files
from version control. These files are generated during the build process
and are not needed in the repository, matching the existing pattern for
TypeScript declaration maps (*.d.ts.map).

This prevents accidentally committing generated sourcemap files like
collections.js.map that provide debugging information but are not
necessary for deployment or source control.

.gitignore

@@ -14,6 +14,7 @@ package-lock.json
 # TypeScript
 *.tsbuildinfo
 *.d.ts.map
+*.map
 
 # Compiled JavaScript (keep .ts source, ignore .js)
 # Exception: Downloaded documentation dependencies