implement separated mods for navigation widgets

src/app/browser/window/tab/item/page/navigation/bookmark/widget.rs

@@ -0,0 +1,24 @@
+use gtk::Button;
+use std::sync::Arc;
+
+pub struct Widget {
+    gobject: Button,
+}
+
+impl Widget {
+    // Construct
+    pub fn new_arc() -> Arc<Self> {
+        Arc::new(Self {
+            gobject: Button::builder()
+                .icon_name("starred-symbolic")
+                .tooltip_text("Bookmark")
+                .sensitive(false)
+                .build(),
+        })
+    }
+
+    // Getters
+    pub fn gobject(&self) -> &Button {
+        &self.gobject
+    }
+}