[Task]: Update copy to match new pricing language

### Description

Subscription-related copy should be updated to match the new [pricing table](https://webrecorder.net/browsertrix/pricing/), such as references to "crawling time".

<img width="1048" height="445" alt="Image" src="https://github.com/user-attachments/assets/3774fbc9-abfb-4d75-985b-5861614d09f2" />

### Context

_No response_