Add Claude local settings file to gitignore

Claude configures a user-level ignore on macOS but the dev container
wants to commit it.

Signed-off-by: Dan Barr <6922515+danbarr@users.noreply.github.com>

Author: danbarr

.gitignore

@@ -23,3 +23,4 @@ yarn-debug.log*
 yarn-error.log*
 .vercel
 .idea
+.claude/settings.local.json