Widen bulk_operations.status so partial bulk results can be recorded (#21)

Found while verifying #21 against the live schema: the model writes
'completed_with_errors' (21 chars) when a bulk operation finishes with
per-ticket failures, but bulk_operations.status was varchar(20), so the
write failed with "Data too long for column 'status'".

This was latent — bulk status changes previously forced every transition
through, so failed was always 0. Now that they honour the Workflow
Designer, a partially-skipped batch is a normal outcome and hits it.

- migrations/001 widens the column to varchar(32) (idempotent).
- The baseline is updated to match, for fresh installs.
- The bookkeeping UPDATE is wrapped in a try/catch: it runs after the
  ticket changes are committed, so an instance deployed ahead of its
  migrations must not turn a completed operation into an error response.

Verified against the live database with a disposable-ticket harness:
comment-required rejection changes nothing, undefined transitions are
refused per ticket with a reason, allowed transitions still work, mixed
batches apply the valid half, and an already-Closed ticket is a no-op.

models/BulkOperationsModel.php

@@ -377,14 +377,22 @@ class BulkOperationsModel
             ];
         }
 
-        // Update operation status
-        $status = $failed > 0 ? 'completed_with_errors' : 'completed';
-        $sql = "UPDATE bulk_operations SET status = ?, processed_tickets = ?, failed_tickets = ?,
-                completed_at = NOW() WHERE operation_id = ?";
-        $stmt = $this->conn->prepare($sql);
-        $stmt->bind_param("siii", $status, $processed, $failed, $operationId);
-        $stmt->execute();
-        $stmt->close();
+        // Update operation status. This is bookkeeping only and runs after the
+        // ticket changes are committed, so a failure here (e.g. the status column
+        // not yet widened by 001_widen_bulk_operations_status.sql on an instance
+        // deployed ahead of its migrations) must not turn a completed operation
+        // into an error response.
+        try {
+            $status = $failed > 0 ? 'completed_with_errors' : 'completed';
+            $sql = "UPDATE bulk_operations SET status = ?, processed_tickets = ?, failed_tickets = ?,
+                    completed_at = NOW() WHERE operation_id = ?";
+            $stmt = $this->conn->prepare($sql);
+            $stmt->bind_param("siii", $status, $processed, $failed, $operationId);
+            $stmt->execute();
+            $stmt->close();
+        } catch (Throwable $e) {
+            error_log("Bulk operation $operationId completed but status bookkeeping failed: " . $e->getMessage());
+        }
 
         $result = ['processed' => $processed, 'failed' => $failed];
         if (!empty($errors)) {