Implement Style Presets for the Text Area Visual in Power BI

[PBECK_MB]

### Title:
Implement Style Presets for the Text Area Visual in Power BI

### Description:
Currently, the Text Area visual does not support Style Presets defined in the Theme JSON. This limitation forces users to manually format text for headings and other styles, which is time-consuming and inconsistent across reports.

### Problem:
- Style Presets are available for some visuals but not for Text Area.
- Users cannot apply predefined styles (e.g., H1, H2, H3) with one click.
- Manual formatting increases maintenance effort and reduces design consistency.

### Proposal:
- Enable the Text Area visual to recognize and apply Style Presets defined in the Theme JSON.
- Add a "Style Presets" section in the Format pane for Text Area, similar to other visuals.
- Allow users to select presets like H1, H2, H3, H4 directly from the Format pane.

### Benefits:
- Consistent, corporate design-compliant text formatting.
- Reduced manual effort for large reports.
- Improved efficiency and user experience.

### Example JSON:
```json
"stylePresets": {
"H1": { "*": [ { "fontSize": 36, "bold": true, "color": { "solid": { "color": "#038281" } } } ] },
"H2": { "*": [ { "fontSize": 28, "bold": true, "color": { "solid": { "color": "#12239E" } } } ] }
}
```

### Priority:
High (Corporate Design, Efficiency)