Do not display selection checkboxes by default in Files app

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Is your feature request related to a problem? Please describe.

In the Files app, selection checkboxes (selection squares) are always visible for files and folders. This adds constant visual noise and makes the interface feel cluttered and overwhelming, particularly when users are simply browsing or viewing files rather than performing bulk actions.

Describe the solution you'd like

Do not display selection squares by default. Instead:

• Only show selection controls after a long click / long press to initiate selection mode (similar to Google Drive), or
• Replace the always-visible selection squares with a more subtle color accentuation (e.g. background highlight or border) when selection mode is active.

This would keep the interface clean while still making multi-selection intuitive and discoverable.

Describe alternatives you've considered

• A user preference to choose between always-visible checkboxes and contextual selection (long click or accentuation).
• Showing selection squares only on hover (desktop) and on long press (touch devices).

No file or test is named. Start by locating the Files app code responsible for displaying selection controls and compare desktop hover with touch long-press behavior. Done means selection controls are hidden during ordinary browsing, selection remains discoverable and usable, and the relevant interaction behavior is covered by the project's tests.