init search on page feature once

src/app/browser/window/tab/item/page/search/placeholder.rs

@@ -0,0 +1,29 @@
+use gtk::{prelude::WidgetExt, Label};
+
+pub struct Placeholder {
+    pub label: Label,
+}
+
+impl Placeholder {
+    // Constructors
+
+    /// Create new `Self`
+    pub fn new() -> Self {
+        Self {
+            label: Label::builder()
+                .css_classes(["error"])
+                .label("Search action requires activation!")
+                .build(),
+        }
+    }
+
+    // Actions
+
+    pub fn show(&self) {
+        self.label.set_visible(true)
+    }
+
+    pub fn hide(&self) {
+        self.label.set_visible(false)
+    }
+}