(core) Showing close button when column is added

Summary:
When a column is added the rename popup had a disabled save button.
Now we always show either:
Just "Close" if there are no changes.
"Save" and "Cancel" if there are changes.

Also, the description is trimmed when saved through the creator panel.

Test Plan: Added

Reviewers: georgegevoian

Reviewed By: georgegevoian

Differential Revision: https://phab.getgrist.com/D3872

app/client/ui/DescriptionConfig.ts

@@ -34,7 +34,7 @@ export function buildDescriptionConfig(
           { onInput: false },
           { rows: '3' },
           dom.on('blur', async (e, elem) => {
-            await origColumn.description.saveOnly(elem.value);
+            await origColumn.description.setAndSave(elem.value.trim());
           }),
           testId('column-description'),
           autoGrow(fromKo(origColumn.description))