Fix list scroll position drifting up after UI refresh

When the post count didn't change, apply_timeline_selection skipped
set_selection if the index was already correct. This left any scroll
drift from in-place set_string calls (LB_DELETESTRING + LB_INSERTSTRING
while frozen) uncorrected, causing the viewport to sit a few rows above
the selected item after a UI update.

Always call set_selection so EnsureVisible runs after thaw, regardless
of whether the selection index changed.

Author: trypsynth

src/ui/timeline_view.rs

@@ -136,10 +136,7 @@ pub fn apply_timeline_selection(timeline_list: &ListBox, timeline: &mut Timeline
 	timeline.selected_id = list_index_to_entry_index(selection, entries_len, sort_order)
 		.map(|entry_index| timeline.entries[entry_index].id().to_string());
 
-	let current_ui_sel = timeline_list.get_selection().map(|s| s as usize);
-	if current_ui_sel != Some(selection) {
-		timeline_list.set_selection(selection as u32, true);
-	}
+	timeline_list.set_selection(selection as u32, true);
 }
 
 pub fn update_active_timeline_ui(