fix(platform): icon-tab-bar _generateTabBarItems function improvement

[dpavlenishvili]

Related Issue(s)

closes #12474 #12554

Description

Screenshots

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After:

Please check whether the PR fulfills the following requirements

During Implementation

1. Visual Testing:

• visual misalignments/updates
• check Light/Dark/HCB/HCW themes
• RTL/LTR - proper rendering and labeling
• responsiveness(resize)
• Content Density (Cozy/Compact/(Condensed))
• States - hover/disabled/focused/active/on click/selected/selected hover/press state
• Interaction/Animation - open/close, expand/collapse, add/remove, check/uncheck
• Mouse vs. Keyboard support
• Text Truncation

2. API and functional correctness

• check for console logs (warnings, errors)
• API boundary values
• different combinations of components - free style
• change the API values during testing

3. Documentation and Example validations

• missing API documentation or it is not understandable
• poor examples
• Stackblitz works for all examples

4. Accessibility testing
5. Browser Testing - Edge, Safari, Chrome, Firefox

PR Quality

• the commit message(s) follows the guideline:
  https://github.com/SAP/fundamental-ngx/blob/main/CONTRIBUTING.md
• tests for the changes that have been done
• all items on the PR Review Checklist are addressed :
  https://github.com/SAP/fundamental-ngx/wiki/PR-Review-Checklist
• Run npm run build-pack-library and test in external application
• update README.md
• Breaking Changes Wiki

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[khotcholava]

What if you store item.color || 'default' in a variable instead of modifying the value directly?
For example: const color = item.color || 'default'
You can then use this variable in cssClasses.

[dpavlenishvili]

Mutating item.color directly ensures that the item consistently has a valid color property in all cases inside return. By updating item.color early, it prevents potential future issues when item.color is referenced elsewhere in the result object or other parts of the code. Essentially, it is necessary for item.color to always have a valid value, but there is no better way to set it by default without similar mutation.

[khotcholava]

LGTM