[FEAT]Standardize Font Sizes Across Admin Dashboard Panels

[DemDem-code]

## Description
Inconsistent font sizes are being applied across various panels of the admin dashboard, leading to a fragmented and unprofessional user experience. A standardized approach to font sizing is needed.

Purpose:
To create a cohesive and consistent visual experience across all admin dashboard panels by standardizing font sizes according to a global style guide.

Acceptance Criteria:

A global style guide for font sizes is created and implemented.
Font sizes are uniform across all admin panels and components.
No panels display font sizes outside the specified ranges.
The visual hierarchy is preserved, with headers, subheaders, and body text clearly differentiated.
Testing confirms that changes are applied correctly across the dashboard.

Requirements:

Audit current font sizes used in various admin panels.
Develop a global style guide for font sizes (headers, subheaders, body text, etc.).
Implement the style guide across all panels and components.
Ensure the changes maintain readability and accessibility standards.
Update documentation and provide guidelines for future design consistency.

Expected Outcome:
All panels in the admin dashboard will display consistent font sizes, contributing to a unified and professional user interface.