ROU-12591: normalize flatpicker arrows between icon libraries

[BenOsodrac]

This pull request updates the icon variables and styling in the src/scss/01-foundations/_icon-library-odc.scss file to improve consistency and appearance of arrow icons, particularly for calendar navigation. The main changes involve introducing new arrow icon variables and updating the selectors for calendar controls to use these variables, along with some style tweaks for different icon libraries.

Icon variable updates:

• Added new CSS variables for --osui-icon-arrow-left and --osui-icon-arrow-right with appropriate Unicode values for both FontAwesome and Phosphor icon libraries. [1] [2]

Calendar navigation styling:

• Updated .flatpickr-prev-month:before and .flatpickr-next-month:before to use the new arrow icon variables instead of chevron icons, ensuring consistent arrow usage for calendar navigation.
• Added specific font size styling for FontAwesome and font weight styling for Phosphor icons in the calendar navigation controls to enhance visual appearance.

Checklist

• tested locally
• documented the code
• clean all warnings and errors of eslint
• requires changes in OutSystems (if so, provide a module with changes)
• requires new sample page in OutSystems (if so, provide a module with changes)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud