[Amphetamine] Fixes Session duration reset when interval changes

[gstvds]

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Description

This PR fixes Session reset duration when interval changes (Closes #16258). It also preserves previous session duration/interval when starting a new Session

Checklist

• [x] I read the extension guidelines
• [x] I read the documentation about publishing
• [x] I ran npm run build and tested this distribution build in Raycast
• [x] I checked that files in the assets folder are used by the extension itself
• [x] I checked that assets used by the README are placed outside of the metadata folder

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Published to the Raycast Store: https://raycast.com/gstvds/amphetamine

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