(core) Redirect less often in welcomeNewUser

Summary:
Instead of always redirecting new users to the home page or the (teams) welcome page,
only redirect when the user signed in for the first time on a personal site, has access to
other sites, and isn't already being redirected to a specific page on their personal site.

Also tweaks how invalid Choice column values are displayed to match Choice List
columns, and fixes a small CSS issue with select by in the page widget picker when
there are options with long labels.

Test Plan: Browser tests.

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D3461

app/client/ui/PageWidgetPicker.ts

@@ -342,11 +342,11 @@ export class PageWidgetSelect extends Disposable {
       cssFooter(
         cssFooterContent(
           // If _selectByOptions exists and has more than then "NoLinkOption", show the selector.
-          dom.maybe((use) => this._selectByOptions && use(this._selectByOptions).length > 1, () => [
+          dom.maybe((use) => this._selectByOptions && use(this._selectByOptions).length > 1, () => cssSelectBy(
             cssSmallLabel('SELECT BY'),
             dom.update(cssSelect(this._value.link, this._selectByOptions!),
                        testId('selectby'))
-          ]),
+          )),
           dom('div', {style: 'flex-grow: 1'}),
           bigPrimaryButton(
             // TODO: The button's label of the page widget picker should read 'Close' instead when
@@ -540,6 +540,12 @@ const cssSmallLabel = styled('span', `
 
 const cssSelect = styled(select, `
   flex: 1 0 160px;
+  width: 160px;
+`);
+
+const cssSelectBy = styled('div', `
+  display: flex;
+  align-items: center;
 `);
 
 // Returns a copy of array with its items sorted in the same order as they appear in other.