Three changes to the Jira Tickets page:
1. CVE ID and Vendor fields are now editable in the Edit Ticket modal
(previously disabled when editing). Backend PUT endpoint validates
CVE format and vendor length on update.
2. Completed tickets (Closed, Done, Resolved, etc.) are shown in a
separate collapsible section below the active tickets table. This
keeps the active work front-and-center.
3. Sync All skips completed tickets on subsequent syncs. When a ticket
first reaches a completed status via sync it gets updated normally,
but on future syncs it won't be included in the batch query to Jira.
Response now includes skippedCompleted count.
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