user: remove dead scroll state from thalamus and unconscious screens

Both had scroll: u16 fields that were never connected to any key
handling or rendering. The unconscious screen renders fixed-size
graph health gauges; thalamus builds a paragraph but never scrolled
it. Neither needs scroll state.

Co-Authored-By: Kent Overstreet <kent.overstreet@gmail.com>

src/user/widgets.rs

@@ -102,7 +102,10 @@ pub fn tree_legend() -> Line<'static> {
     )
 }
 
-/// Render a paragraph with a vertical scrollbar.
+/// Render a scrollable paragraph with a vertical scrollbar.
+///
+/// Legacy wrapper — callers that manage their own `u16` scroll offset
+/// use this. For new code, prefer ScrollPane + ScrollPaneState.
 pub fn render_scrollable(
     frame: &mut Frame,
     area: Rect,