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/ui/cctvPresentation.js

@@ -171,7 +171,7 @@ export function _renderCctvState(state) {
         '{city} · HDG {heading} · FOV {fov} · RANGE {range}m · {projection}{calBadge} · {provider}{status}',
         {
           city: activeCamera.city,
-          heading: `${Math.round(activeCamera.headingDeg)}°`,
+          heading: `${Math.round(activeCamera.headingDeg) % 360}°`,
           fov: `${Math.round(activeCamera.fovDeg)}°`,
           range: Math.round(activeCamera.rangeM),
           projection: projLabel,