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/thalamus.rs

@@ -13,12 +13,11 @@ use super::{App, ScreenView, screen_legend};
 
 pub(crate) struct ThalamusScreen {
     sampling_selected: usize,
-    scroll: u16,
 }
 
 impl ThalamusScreen {
     pub fn new() -> Self {
-        Self { sampling_selected: 0, scroll: 0 }
+        Self { sampling_selected: 0 }
     }
 }
 
@@ -148,8 +147,7 @@ impl ScreenView for ThalamusScreen {
 
         let para = Paragraph::new(lines)
             .block(block)
-            .wrap(Wrap { trim: false })
-            .scroll((self.scroll, 0));
+            .wrap(Wrap { trim: false });
 
         frame.render_widget(para, area);
     }

src/user/unconscious.rs

@@ -6,35 +6,22 @@ use ratatui::{
     text::{Line, Span},
     widgets::{Block, Borders, Gauge, Paragraph},
     Frame,
-    crossterm::event::KeyCode,
 };
 
 use super::{App, ScreenView, screen_legend};
 use crate::subconscious::daemon::GraphHealth;
 
-pub(crate) struct UnconsciousScreen {
-    scroll: u16,
-}
+pub(crate) struct UnconsciousScreen;
 
 impl UnconsciousScreen {
-    pub fn new() -> Self { Self { scroll: 0 } }
+    pub fn new() -> Self { Self }
 }
 
 impl ScreenView for UnconsciousScreen {
     fn label(&self) -> &'static str { "hippocampus" }
 
     fn tick(&mut self, frame: &mut Frame, area: Rect,
-            events: &[ratatui::crossterm::event::Event], app: &mut App) {
-        for event in events {
-            if let ratatui::crossterm::event::Event::Key(key) = event {
-                if key.kind != ratatui::crossterm::event::KeyEventKind::Press { continue; }
-                match key.code {
-                    KeyCode::PageUp => { self.scroll = self.scroll.saturating_sub(20); }
-                    KeyCode::PageDown => { self.scroll += 20; }
-                    _ => {}
-                }
-            }
-        }
+            _events: &[ratatui::crossterm::event::Event], app: &mut App) {
 
         let block = Block::default()
             .title_top(Line::from(screen_legend()).left_aligned())

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,