(core) Improving experience when editing group-by column.

Summary:
Improving experience when editing group-by column:
- Disable column rename
- Allow changing most widget properties:
 - Color/Background
 - Number format
 - Date/DateTime format (but not the timezone)
 - All toggle options (for toggle column)
- Remove Edit button on Choice Edit
- Changing the underlying column should reset all those options back to the original column.

Test Plan: nbrowser

Reviewers: alexmojaki

Reviewed By: alexmojaki

Subscribers: alexmojaki

Differential Revision: https://phab.getgrist.com/D3216

app/client/ui/FieldConfig.ts

@@ -58,7 +58,8 @@ export function buildNameConfig(owner: MultiHolder, origColumn: ColumnRec, curso
         cssColTieConnectors(),
         cssToggleButton(icon('FieldReference'),
           cssToggleButton.cls('-selected', (use) => !use(untieColId)),
-          dom.on('click', () => untieColId.saveOnly(!untieColId.peek())),
+          dom.on('click', () => !origColumn.disableModify.peek() && untieColId.saveOnly(!untieColId.peek())),
+          cssToggleButton.cls("-disabled", origColumn.disableModify),
           testId('field-derive-id')
         ),
       )
@@ -391,6 +392,10 @@ const cssToggleButton = styled(cssIconButton, `
   &-selected:hover {
     --icon-color: ${colors.darkGrey};
   }
+  &-disabled, &-disabled:hover {
+    --icon-color: ${colors.light};
+    background-color: var(--grist-color-medium-grey-opaque);
+  }
 `);
 
 const cssColLabelBlock = styled('div', `