feat: allow to disable silence filtering

[AlexP11223]

Before Submitting This PR

Please confirm you have done the following:

• I have searched existing issues and pull requests (including closed ones) to ensure this isn't a duplicate
• I have read CONTRIBUTING.md

Human Written Description

I added the "Filter Silence" checkbox (default on) in the Advanced settings, so that it is possible to disable silence filtering.
The silence filtering was causing issues for me, at least when speaking quietly. Some parts of the audio were missing in the history, such as in the middle.
It seems that in my case Whisper (Large) itself handles silence quite well, I have seen some hallucination only in very short texts, like several words.

Testing

1. Disable "Filter Silence"
2. Record something, making long pauses.
3. Play the recording from the history, see that all pauses are still present.
4. Enable "Filter Silence"
5. Record something, making long pauses.
6. Play the recording from the history, see that the pauses are removed.

Screenshots/Videos (if applicable)

AI Assistance

• No AI was used in this PR
• AI was used (please describe below)

If AI was used:

• Tools used: Claude Code (Opus)
• How extensively: I used it for planning and generating the code, because I do not have much experience with Rust and not familiar with the project. But everything was reviewed and tested.

[cjpais]

Ill be adding this in #832 directly, so it will supersede this