Cody Seibert d7a32b2314 feat: Show error toast when concurrency limit is reached
When a user tries to drag a card from backlog to in_progress while at the
max concurrency limit, a toast notification now appears explaining why the
action was blocked and suggesting solutions.

- Added sonner toast library
- Show error toast with dynamic message based on max concurrency
- Updated test utilities with toast helpers

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2025-12-09 01:18:42 -05:00
2025-12-07 16:43:26 -05:00
2025-12-07 16:43:26 -05:00
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