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/panelEscape.test.mjs

@@ -2,8 +2,6 @@ import { readShellSource } from './testSupport/readShellSource.mjs';
 import { onKeyDown as cockpitKeyDown } from './ui/cockpitInput.js';
 import { readFileSync as readRadioSource } from 'node:fs';
 const radioBindings = readRadioSource(new URL('./ui/radioBindings.js', import.meta.url), 'utf8');
-const radioPresentation = readRadioSource(new URL('./ui/radioPresentation.js', import.meta.url), 'utf8');
-const radioControlsSource = readRadioSource(new URL('./ui/radioControls.js', import.meta.url), 'utf8');
 import { bindPanelDisclosure, collapsePanelOnEscape } from './ui/panelDisclosure.js';
 import assert from 'node:assert/strict';
 import test from 'node:test';