🐛 [firestore-translate-text] Broken formatting when using Gemini

### Configuration

- Extension name: **firestore-translate-text**
- Extension version: **0.1.25**
- Configuration values:
- Translation Provider: **Gemini**

### Describe the problem

When using the extension to translate text, the original formatting is not preserved. Specifically, line breaks (newlines) are removed or collapsed into a single paragraph after translation.

common.ts:120 contains this code:

const sanitizedText = text
.replace(/\\/g, "\\\\")
.replace(/"/g, '\\"')
.replace(/\n/g, " ");

which probably causes this issue.

#### Steps to reproduce:

1. Select or input text containing multiple lines / paragraphs
2. Use the extension to translate the text
3. Observe the translated output

##### Expected result

The translated text should preserve the original formatting.

##### Actual result

All line breaks are removed, and the translated text is returned as a single block of text.