Multiple navigation and usability issues are observed across the application affecting user experience and accessibility:

Issue 1: Navigation Icons Visibility

Description:
Bottom navigation icons are not clearly visible due to low color contrast with the background.

Steps to Reproduce:

1. Open any module in the application
2. Observe the bottom icons

Expected Result:
Icons should be clearly visible with proper contrast

Issue 2: Missing Back Button on ABHA Screen

Description:
Back navigation is not available on the ABHA screen, causing navigation issues.

Steps to Reproduce:

1. Navigate to ABHA module
2. Open "Create ABHA" screen
3. Check header

Expected Result:
Back button should be available for navigation

Issue 3: Missing Home Icon for Quick Navigation

Description:
There is no Home icon available in module headers, forcing users to navigate back multiple times to reach the home screen.

Steps to Reproduce:

1. Open any module (e.g., TB Screening, Diagnostics, ABHA)
2. Navigate to inner screens
3. Try returning to Home

Expected Result:
Home icon should be available in header for direct navigation