fix(gui): disable text selection on UI labels, add edge-scroll during drag

UI labels (status, headings, control text) no longer selectable.
Console/hex content remains selectable for copy. ScrollArea now
nudges when drag-selecting near the bottom edge (~240px/s).

crates/pipeview-gui/src/panels/session_controls.rs

@@ -1,5 +1,5 @@
 use crate::models::{ConnectionStatus, SessionTab, View};
-use egui::TextEdit;
+use egui::{Label, TextEdit};
 use pipeview_client::SessionManager;
 use pipeview_core::transport::TransportConfig;
 
@@ -30,11 +30,14 @@ pub fn render_search_bar(ui: &mut egui::Ui, tab: &mut SessionTab) {
             tab.search.next();
         }
 
-        ui.label(format!(
-            "{}/{}",
-            tab.search.current_display(),
-            tab.search.match_count()
-        ));
+        ui.add(
+            Label::new(format!(
+                "{}/{}",
+                tab.search.current_display(),
+                tab.search.match_count()
+            ))
+            .selectable(false),
+        );
 
         if ui.button("▲").clicked() {
             tab.search.prev();