Dashboard with stats like speaking, time, typing time, words captured, total sessions, graph

**Is your feature request related to a problem? Please describe.**
I'd like to see how many words I've spoken & how fast it was. Basically, showing how much time it saved me.

**Describe the solution you'd like**
VoiceInk does this:

<img width="2676" height="2202" alt="Image" src="https://github.com/user-attachments/assets/6e022616-0973-45b9-873c-eda960352abc" />