fix(collections/list): remove hover background darkening in list view

[Aitanuqui]

It partially fixes #8267 by removing hover background darkening in list view. Progressive background darkening in nested notes still needs to be addressed.

[gemini-code-assist]

Summary of Changes

Hello @Aitanuqui, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the visual behavior of note cards by adjusting their hover effects. It specifically removes an unintended background darkening effect when hovering over note cards in the standard list view, while ensuring the desired hover effect remains active for note cards displayed in the grid view. This change partially resolves a reported UI issue related to inconsistent hover styling.

Highlights

• Targeted Hover Effect: The background darkening on hover for note cards is now specifically applied only when the note list is in "grid-view" mode.
• Fix for List View: The general hover background darkening has been removed from the default list view, addressing the issue of unwanted darkening in that context.

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[gemini-code-assist]

Code Review

This pull request correctly removes the hover background darkening effect from note cards in the list view, while retaining it for the grid view. The change is implemented by removing a general hover rule and consolidating the hover styles into the grid-view-specific rule. My feedback includes a suggestion to improve CSS selector consistency, which will enhance maintainability.

[gemini-code-assist]

For consistency with the nearby :active selector for the same element (:root .note-list.grid-view .note-book-card:active), it would be good to prefix this selector with :root as well. This will improve the maintainability and readability of the stylesheet.

:root .note-list.grid-view .note-book-card:hover {