Function render_scrollbar 

pub fn render_scrollbar(
    f: &mut Frame<'_>,
    area: Rect,
    total: usize,
    position: usize,
)

Builds a widget title Line with an optional keyboard-shortcut digit indicator.

The digit and ─ separator blend into the border line (same color), producing:

┌─ 1 ─ Favorites ────────────────────────────────────────────┐

• shortcut = Some(1) → [1] ─ Label
• shortcut = None → Label

active controls the label style (Theme::tab_active vs Theme::tab_inactive) and the digit+separator color (Theme::border_focused vs Theme::border_unfocused), so they always match the surrounding border.

Example

// Simple panel title, always active
let title = widget_title("Now Playing", None, true, &theme);

// Panel with shortcut indicator, focus-aware
let title = widget_title("Favorites", Some(1), focused, &theme);

Render a native ratatui vertical scrollbar over the right border of area.

Pass the outer block area (including borders). The scrollbar overlaps the right border column, which is the standard ratatui pattern.

• total — total number of content rows / lines.
• position — index of the first visible row (the scroll offset).

Does nothing when all content fits in the visible area.