Add vertical scroll to Notes field in EditTask popup

- Added notes_scroll to App and AppView
- Up/Down in Notes field scrolls (Tab cycles fields instead)
- Reset scroll on opening EditTask popup
- Notes Paragraph uses .scroll((notes_scroll, 0))

src/ui/components.rs

@@ -326,6 +326,7 @@ pub fn render_edit_task_popup(
     title_cursor: usize,
     notes: &str,
     notes_cursor: usize,
+    notes_scroll: u16,
     active_field: usize,
 ) {
     let popup_area = centered_rect(75, 14, area);
@@ -382,7 +383,8 @@ pub fn render_edit_task_popup(
     let notes_lines: Vec<Line> = notes.lines().map(|l| Line::from(Span::raw(l.to_string()))).collect();
     let notes_para = Paragraph::new(Text::from(notes_lines))
         .block(notes_block)
-        .wrap(Wrap { trim: false });
+        .wrap(Wrap { trim: false })
+        .scroll((notes_scroll, 0));
     frame.render_widget(notes_para, rows[2]);
 
     // ── Date buttons row ──