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/voice/realtimeNarration.test.mjs

@@ -135,7 +135,7 @@ test('an old progress completion leaves the active in-band response alone', asyn
 });
 
 test('user speech stops an audible progress line: cancel and clear its audio', async () => {
-  const { controller, sent, event, progressLine } = controllerFixture();
+  const { sent, event, progressLine } = controllerFixture();
   await progressLine('resp_p');
   await event({ type: 'output_audio_buffer.started', response_id: 'resp_p' });
   sent.length = 0;