Remember when the setup picker is dismissed

[Minh Vu (fallintoplace)]

Summary

• remember when the first-run setup picker is dismissed without a selection
• distinguish dismissal from the existing accepted flow
• keep manual setup available through the Command Palette
• document the updated first-run behavior

Testing

• npm run check-types
• npm run lint
• npm test (96 passing)

[Oz Zafar (ozzafar)]

The dismissal state is recorded correctly without affecting accepted selections, and manual setup remains available. I validated the merge result against current main; compile, lint, and all 136 tests pass. A focused QuickPick dismissal test would be useful follow-up coverage, but I do not consider it merge-blocking.