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/firstRunExperience.test.mjs

@@ -373,10 +373,6 @@ test('one ESC does one thing — the radio disclosure stops the launcher outrigh
     new URL('./ui/radioBindings.js', import.meta.url),
     'utf8',
   );
-  const module = fs.readFileSync(
-    new URL('./firstRunExperience.js', import.meta.url),
-    'utf8',
-  );
 
   // stopPropagation() does NOT stop later listeners on the SAME document, so the
   // disclosure's earlier capture handler closed the disclosure and the launcher