Update mobile logo to 2026 #3281

Job	Run time
Check pretix needs building	10s
Check frontend needs building	14s
Check backend needs building	10s
Build backend	0s
Build pretix	0s
Deploy backend	31s
Wait backend deployment	10s
Build frontend / Build	3m 45s
Deploy frontend	35s
Wait frontend deployment	1m 8s
	6m 43s

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