fix(tabs): fix non-working Sass theme parameters

[adrianptrv]

Closes: #1915
Requires this theming PR: 495

• Replaced igx-icon with igc-icon in the Tabs WC demo (Angular project) to ensure the Tabs theme "icon" parameters work correctly. #16395
• Also set up the newly added theme parameters - $item-active-hover-background $item-active-hover-color $item-active-hover-icon-color

[didimmova]

Angular:
-No border radius applied in material theme


WC:


• No border color
• No border color hover


Disabled button is using button-background in angular and item-background for WC, check which one is right

Screen.Recording.2025-10-30.at.8.57.59.mov

[desig9stein]

THEME: INDIGO
It looks like item-active-background is not used anywhere in the Indigo theme, including in the Angular repo. Its current value also seems incorrect: when I apply it in the expected place, it renders as transparent. I believe it should use the same color as the item-hover-background, since that’s what is currently used in that state.

[adrianptrv]

THEME: INDIGO It looks like item-active-background is not used anywhere in the Indigo theme, including in the Angular repo. Its current value also seems incorrect: when I apply it in the expected place, it renders as transparent. I believe it should use the same color as the item-hover-background, since that’s what is currently used in that state.

I have added and set up three new parameters for the active tab - $item-active-hover-background $item-active-hover-color $item-active-hover-icon-color
The changes can now be tested again using this theming PR: 495

[desig9stein]

@adrianptrv, the active background is still not working. I should be able to see the active background on the active tab in the idle state and the active hover background when I hover the active tab.