Unlike most BYOC PCB's, the entire lighter green area on the back of the Mouse PCB is ground plane. If you look very closely, you can see that the lower diode eyelets connect to that lighter area with very small traces, rather than being isolated from it for their full circumference. You can always check for continuity to ground with a multimeter if you want to reassure yourself that what I'm saying is so.
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“My favorite programming language is SOLDER” - Bob Pease (RIP)
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