[BUG]: UI Overflow and Outdated Prescription Handling in Transcription Screen

### Bug Description

## Issue Description

The Transcription Screen has the following issues:

1. **UI Overflow (RenderFlex Error)**
- A horizontal overflow occurs in the status indicator row.
- This happens when long status text exceeds screen width.

2. **Outdated Prescription Usage**
- The UI still relies on `controller.prescription`, which is no longer available after migrating to structured AI responses.
- This causes compilation errors.

3. **Inconsistent UX with New AI Structure**
- The app now supports structured insights (symptoms, medicines), but the UI still shows a "Prescription" button.
- This leads to mismatch between backend logic and UI.

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## Expected Behavior

- Status text should not overflow on small screens.
- UI should use structured data (`symptoms`, `medicines`) instead of deprecated fields.
- Navigation should reflect updated AI outputs via a dedicated screen.

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## Suggested Fix

- Wrap status `Text` widget with `Expanded` and apply `TextOverflow.ellipsis`
- Replace `controller.prescription` with structured getters
- Introduce a new `MedicalInsightsScreen` for better UX

### Steps to Reproduce

_No response_

### Logs and Screenshots

_No response_

### Environment Details

_No response_

### Impact

Critical - Application is unusable

### Code of Conduct

- [x] I have joined the [Discord server](https://discord.gg/hjUhu33uAn) and will post updates there
- [x] I have searched existing issues to avoid duplicates