feat(table): column drag-and-drop reorder (#3738)

* feat(table): column drag-and-drop reorder

* fix(table): remove duplicate onDragEnd call from handleDrop

* fix(table): persist columnOrder on rename/delete and defer delete to onSuccess

* fix(table): prevent stale refs during column drag operations

Fix two bugs in column drag-and-drop:
1. Stale columnWidths ref during rename - compute updated widths inline
   before passing to updateMetadata
2. Escape-cancelled drag still reorders - update dropTargetColumnNameRef
   directly in handleColumnDragLeave to prevent handleColumnDragEnd from
   reading stale ref value

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(table): insert column at correct side when anchor is unordered

When the anchor column isn't in columnOrder, add it first then insert
the new column relative to it, so 'right' insertions appear after the
anchor as expected.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

apps/sim/app/api/table/[tableId]/metadata/route.ts

@@ -13,6 +13,7 @@ const MetadataSchema = z.object({
   workspaceId: z.string().min(1, 'Workspace ID is required'),
   metadata: z.object({
     columnWidths: z.record(z.number().positive()).optional(),
+    columnOrder: z.array(z.string()).optional(),
   }),
 })