fix(cctv): show a camera facing 359.6° as HDG 0°, not HDG 360°

The CCTV HUD heading token and the camera panel's meta line rounded the
bearing without wrapping, so a camera facing 359.5° or more (a feed
bearing, or a heading calibrated just west of north) read "HDG 360°".
Both now wrap after rounding: 359.6° reads "HDG 0°", 359.4° "HDG 359°".

src/layers/cctv/headingConfidence.js

@@ -44,7 +44,8 @@ export function isHeadingEstimated(camera) {
  * @returns {string}
  */
 export function headingHudToken(camera) {
-  const hdg = Math.round(Number(camera?.headingDeg) || 0);
+  // 359.5° and above rounds to north; modulo keeps it from printing 360°.
+  const hdg = Math.round(Number(camera?.headingDeg) || 0) % 360;
   return isHeadingEstimated(camera)
     ? t('HDG {value}° (ESTIMATED)', { value: hdg })
     : t('HDG {value}°', { value: hdg });

src/layers/cctv/headingConfidence.test.mjs

@@ -44,6 +44,15 @@ test('HUD token tags a synthetic bearing and rounds the degrees', () => {
   );
 });
 
+test('HUD token reads a bearing that rounds to north as 0°, not 360°', () => {
+  assert.equal(headingHudToken({ headingDeg: 359.4 }), 'HDG 359°');
+  assert.equal(headingHudToken({ headingDeg: 359.6 }), 'HDG 0°');
+  assert.equal(
+    headingHudToken({ headingDeg: 359.5, headingConfidence: 'low' }),
+    'HDG 0° (ESTIMATED)',
+  );
+});
+
 test('HUD token stays untagged for surveyed and calibrated bearings', () => {
   assert.equal(
     headingHudToken({ headingDeg: 67.5, headingConfidence: 'high' }),