BUG: Fix "Text strings must be rendered within a <Text> component" error in SymptomsScreen

### Is there an existing issue for this?

- [x] I have searched the existing issues

### What happened?

## 📌 Issue Overview

Problem:
Users were encountering a "Text strings must be rendered within a component" error when interacting with the Symptoms screen, specifically when rendering the list of symptom history. This error typically occurs in React Native when whitespace or text characters exist directly inside a View component without being wrapped in a Text component.

## 🔍 Steps to Reproduce
Root Cause:

1. In SymptomsScreen.jsx, there was loose whitespace/formatting in the JSX where the "Week" number was being rendered inside the history card.

2. In HeaderWithBack.jsx, a JSX comment ({/* Spacer ... */}) was placed after a View component. In some contexts, this can be interpreted as a text node or introduce unwanted whitespace.

## 🎯 Expected Behavior

## 🚨 Actual Behavior

## 📷 Screenshot

## 💡 Suggested Improvements
1. Refactored the JSX in [SymptomsScreen.jsx](vscode-file://vscode-app/Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/code/electron-browser/workbench/workbench.html) to remove unnecessary whitespace around the "Week {entry.week_number}" text node.

2. Removed the inline comment in [HeaderWithBack.jsx](vscode-file://vscode-app/Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/code/electron-browser/workbench/workbench.html) to ensure clean rendering of the layout spacer.

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