fix(sources): name the Sources sort group; refit the switcher on resize

Local review on the PR round:

- Greptile: the Sources sort menu's radio group had no accessible name,
  unlike every other menu group (UI guidelines). It is named by its
  section, "Sort by".
- Codex: the switcher popover capped its height once, when it opened, so
  shrinking the window while it was open left the footer and the lower
  rows out of reach. A window resize refits the open popover.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/workspace/shell/feature/src/lib/workspace-sources/workspace-sources.component.html

@@ -49,7 +49,12 @@
                     class="app-menu"
                     xPosition="before"
                 >
-                    <div role="group">
+                    <div
+                        role="group"
+                        [attr.aria-label]="
+                            'WORKSPACE.REFINE_SORT_SECTION' | translate
+                        "
+                    >
                         @for (option of sortOptions; track $index) {
                             <button
                                 mat-menu-item

libs/workspace/shell/feature/src/lib/workspace-sources/workspace-sources.component.spec.ts

@@ -293,6 +293,10 @@ describe('WorkspaceSourcesComponent', () => {
             ...Array(7).fill('menuitemradio'),
             'menuitemcheckbox',
         ]);
+        // The radio group is named by its section, as every menu group is.
+        expect(
+            rows[0].closest('[role="group"]')?.getAttribute('aria-label')
+        ).toBe('WORKSPACE.REFINE_SORT_SECTION');
         expect(rows.map((row) => row.getAttribute('aria-checked'))).toEqual([
             'true',
             ...Array(7).fill('false'),