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.

scripts/qa-final-polish-credits.mjs

@@ -52,7 +52,6 @@ try {
       id,
       value,
     );
-  const text = () => page.$eval('#cesium-credits', (e) => e.innerText);
   const shot = async (name, osm, tiles) => {
     await sleep(300);
     const state = await page.$eval('#cesium-credits', (e) => {

scripts/qa-radio.mjs

@@ -1291,8 +1291,6 @@ async function main() {
     const clusterBadge = await page.evaluate(async () => {
       const viewer = window.__godsEyeView.viewer;
       const { getOverlayPaintRect, getWorldOverlayDiagnostics } = await import('/src/overlays/worldOverlay.js');
-      const { distanceFade } = await import('/src/overlays/worldOverlayDraw.js');
-      const { radioStationIdFromPick } = await import('/src/data/radio.js');
       const baselineSolveRevision = getWorldOverlayDiagnostics().solveRevision;
       const source = Array.from({ length: viewer.dataSources.length }, (_, index) => viewer.dataSources.get(index))
         .find((item) => item.name === 'Radio stations');

scripts/qa-traffic-oblique.mjs

@@ -80,9 +80,7 @@ try {
       page.evaluate(() => {
         const { viewer, dataManager } = window.__godsEyeView;
         let upper = 0,
-          lower = 0,
-          near = 0;
-        const camera = viewer.camera.positionWC;
+          lower = 0;
         dataManager.layers
           .get('traffic')
           .module.visitMotionDots((id, key, p) => {

scripts/qa-vessel-cards.mjs

@@ -295,7 +295,7 @@ async function main() {
       );
 
       // Wait for the photoreal tileset and at least one vessel refresh.
-      const settled = await page
+      await page
         .waitForFunction(() => {
           const gev = window.__godsEyeView;
           const t = gev.tileset;