test: cover jobs in Settings, and unpick two shared selectors

The spec worth having is not that the tab is gone -- that is one line
of a table -- but that nothing became unreachable when it went. #24
promises that no action is ever unreachable at any supported size, and
deleting a destination is exactly the change that quietly breaks it.

Two existing selectors had to give. `config-section .header` is
ambiguous the moment a section holds a job, because `job-details-drawer`
carries that class too -- so `settings-reach.spec.ts` locates a
disclosure by role and name instead. And `page-header`'s and
`offline-icons`'s view lists lose an entry each.

Closes #27

e2e/specs/offline-icons.spec.ts

@@ -28,7 +28,7 @@ const EXPECTED_MIN_ICONS = 5;
 
 const VIEWS = [
   'home', 'tracks', 'albums', 'artists', 'genres', 'playlists',
-  'explore', 'downloads', 'jobs', 'settings',
+  'explore', 'downloads', 'autotag', 'settings',
 ];
 
 type IconState = { name: string; hasSvg: boolean };