Move "代客提交工单" back into a native <dialog> on the ticket list while
the ticket workspace stays a full page. Closing asks before discarding
input, ignores backdrop clicks, resets the form and returns focus; an
uncertain create result keeps the form locked behind "重新加载".
Remove the ?view=new create page route and its styles.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>