fix(zh-CN): localize readouts and keep short labels intact

Preserve Chinese unit casing and spacing in the HUD and cockpit, localize FIRMS cache ages, CCTV health and radio counts, and keep imagery resolution and route modes readable. Add regression coverage for localized output and unchanged English.

Co-Authored-By: Codex (GPT-6) <[email protected]>

src/ui/cockpitPresentation.js

@@ -1,5 +1,5 @@
 /** Pure formatting and fixed presentation constants used by Cockpit components. */
-import { formatNumber, t, msg } from '../i18n/index.js';
+import { formatNumber, getLocale, t, msg } from '../i18n/index.js';
 import { formatQuantity } from './unitLabels.js';
 
 export const COCKPIT_HEADING_SLEW_DPS = 28;
@@ -145,10 +145,11 @@ export function formatCockpitCoordinate(value, positive, negative) {
  */
 export function formatCockpitDistance(distanceM) {
   const digits = distanceM < 10000 ? 1 : 0;
-  return formatQuantity(distanceM / 1000, 'km', {
+  const distance = formatQuantity(distanceM / 1000, 'km', {
     minimumFractionDigits: digits,
     maximumFractionDigits: digits,
-  }).toUpperCase();
+  });
+  return getLocale() === 'zh-CN' ? distance : distance.toUpperCase();
 }
 
 export function formatCockpitWindDirection(value) {