chore: remove the remaining unused local bindings

An ESLint no-unused-vars scan over src, server, scripts, tools, build
and pinokio, repeated until it is stable, reported these.

Runtime modules keep every call and drop only the unread binding:
- src/ui/cockpitInput.js: the unread result of enter()/exit().
- src/layers/launches/rendering.js: the unread entity returned by
  entities.add().
- src/layers/radio/rendering.js: the unread map key in the horizon scan,
  which now iterates the map's values.

QA scripts and tools drop an unused helper, two unused in-page module
imports, unused counters and destructured fields, and an unread wait
result. Tests drop source files read into variables that no assertion
uses, redundant StyleManager imports (the shell-source helper already
imports it), and unused destructured fields.

The one remaining report is the `_` loop variable in src/tools/schema.js,
which counts iterations and is intentional.

src/loadingFeedback.test.mjs

@@ -93,7 +93,6 @@ test('deferred terminal notices lose ownership to newer acquisition epochs and d
 });
 
 test('share-follow failures use the universal top-center status instead of the bottom toast', () => {
-  const ui = readShellSource();
   const handler = shellMethod('_handleShareTrackingRestoreStatus').toString();
   assert.match(handler, /this\.showStatus\(message\)/);
   assert.match(handler, /this\.initialRestorePromise\.then\(showAfterStartupCover\)/);