revert 49a9c33836

revert feat(earth): toolbar and zoom improvements

- Add box-sizing/padding normalization to toolbar buttons
- Remove zoom slider, implement click/hold zoom behavior (+/- buttons)
- Add 10% step on click, 1% continuous on hold
- Fix satellite init: show satellite points immediately, delay trail visibility
- Fix breathing effect: faster pulse, wider opacity range
- Add toggle-cables functionality with visibility state
- Initialize satellites and cables as visible by default

frontend/public/earth/js/cables.js

@@ -11,7 +11,6 @@ export let cableLines = [];
 export let landingPoints = [];
 export let lockedCable = null;
 let cableIdMap = new Map();
-let cablesVisible = true;
 
 function getCableColor(properties) {
   if (properties.color) {
@@ -407,17 +406,3 @@ export function resetLandingPointVisualState() {
     lp.scale.setScalar(1.0);
   });
 }
-
-export function toggleCables(show) {
-  cablesVisible = show;
-  cableLines.forEach(cable => {
-    cable.visible = cablesVisible;
-  });
-  landingPoints.forEach(lp => {
-    lp.visible = cablesVisible;
-  });
-}
-
-export function getShowCables() {
-  return cablesVisible;
-}