Enable horizontal scrolling in dashboard widgets

[multiplex55]

Motivation

• Allow horizontal overflow to be scrollable in several dashboard list widgets by switching to egui::ScrollArea::both().
• Preserve existing vertical behavior and sizing constraints by keeping show_rows and the row_height calculations unchanged.
• Ensure long labels and snippets do not wrap and instead scroll horizontally by avoiding forced width constraints and disabling wrapping (.wrap(false)).
• Keep behavior consistent with the existing todo widget which already used ScrollArea::both().

Description

• Replaced egui::ScrollArea::vertical() with egui::ScrollArea::both() in src/dashboard/widgets/{clipboard_recent.rs,clipboard_snippets.rs,notes_recent.rs,process_list.rs,query_list.rs,recent_notes.rs,tempfiles.rs}.
• Switched list row widgets to non-wrapping variants using ui.add(egui::Button::new(...).wrap(false)) and ui.add(egui::Label::new(...).wrap(false)) so long text can grow horizontally and be scrolled.
• Preserved show_rows(...), auto_shrink([false; 2]), and the original row_height calculations so vertical scrolling and sizing remain unchanged.
• Adjusted process_list to use non-wrapping buttons/labels for consistent horizontal-scroll behavior alongside the other list widgets.

Testing

• No automated tests or CI jobs were run as part of this change.

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Codex Task