Fix toolbar button colors in action widget list rows

[Copilot]

Toolbar action buttons (e.g. tools icon) inside action widget picker rows had incorrect hover background and could get wrong foreground colors from the list widget's dynamic focus/selection styles.

• Toolbar hover background: Changed from var(--vscode-toolbar-hoverBackground) to transparent so the button blends with the row's --vscode-list-hoverBackground instead of showing a competing hover color.
• Codicon color specificity: Added .monaco-list to the .codicon { color: inherit } selector, bumping specificity from 5→6 classes. This prevents the list widget's dynamically-injected .monaco-list.suffix .monaco-list-row.focused .codicon rule (5 classes) from overriding it with listInactiveSelectionIconForeground.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Foreground button color issue for tools within mode</issue_title>
<issue_description>Theme: light+

But I also don't understand why we have tool within this picker but also next to model picker

</issue_description>

<agent_instructions>Fix the issue. currently the background color of the actionbar action is set like this:
.action-widget .monaco-list-row .action-list-item-toolbar .monaco-action-bar:not(.vertical) .action-label:not(.disabled):hover

ideally it would not use list-activeSelectionBackground but the same color as the action which uses --vscode-list-hoverBackground because hovering it focuses it. i think. I want the action label to not have --vscode-list-hoverBackground color when theactionbar item is hovered and that item should have --vscode-list-hoverBackground</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Foreground button color issue for tools within mode #296263

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