normalize tab items component

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

@@ -0,0 +1,28 @@
+use gtk::Button;
+
+pub struct Bookmark {
+    widget: Button,
+}
+
+impl Bookmark {
+    // Construct
+    pub fn new() -> Self {
+        Self {
+            widget: Button::builder()
+                .icon_name("starred-symbolic")
+                .tooltip_text("Bookmark")
+                .sensitive(false)
+                .build(),
+        }
+    }
+
+    // Actions
+    pub fn update(&self) {
+        // @TODO
+    }
+
+    // Getters
+    pub fn widget(&self) -> &Button {
+        &self.widget
+    }
+}