Add 12h/AM-PM clock format for Imperial units, add miles to distance display
The header clock now shows 12-hour time with AM/PM when Imperial units are selected (Menu > Units), instead of always using 24-hour format - the clock-clear region was widened from 50px to 80px to fully erase the longer "12:59PM"-style text. The aircraft detail panel's distance line now also shows miles alongside km and nautical miles (e.g. "12km / 6nm / 7mi"), since nm alone wasn't self-explanatory for lay users from Imperial-unit countries. Also fixes the radar screen's range button, which still always showed a fixed "km" label regardless of the Metric/Imperial setting - it now shows mi (converted) when Imperial is selected, matching the pattern already used by the altitude legend. Refreshes firmware.bin to match this build. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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