feat(desktop): Add system idle detection and set interval to 0.5s

[KShivendu]

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Description

Add system idle detection and set interval to 0.5s

Dependencies

• None (Thanks to Electron)

Mentions

@ambarvm

[ambarvm]

i am strongly against reducing interval. background process regularly crosses 1% on my i5. also, accurate seconds are not important for this application.

[ambarvm]

how is system idle detected? probably timeout after input which may count watching a video as idle. if the idle detection is not reliable, we need to keep it behind an opt-in setting.