Lőrinc 14f99cfe53
rpc: make uptime monotonic across NTP jumps
Compute `uptime` from `SteadyClock` so it is unaffected by system time changes after startup.

Derive GUI startup time by subtracting the monotonic uptime from the wall clock time.

Add a functional test covering a large `setmocktime` jump.

Co-authored-by: MarcoFalke <*~=`'#}+{/-|&$^_@721217.xyz>
2026-01-19 17:08:08 +01:00
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