fix: process uptime in dev tools #5961
                
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Description
Fixes #5960
The recent change of the system monitor causes an issue where the uptime resets every time the performance tab is opened.
Current version:
Screencast.From.2025-11-01.09-06-46.mp4
Fixed version:
Screencast.From.2025-11-01.09-07-56.mp4
Contribution Checklist:
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