feat: add placeholder property to input widget

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
 
 - `gtk_ui` function for loading .ui files.
 - `widget-control` (`wc` in short) command for controlling widgets.
+- `placeholder` property to input widget.
 
 ## [0.3.1] - 2025-11-01
 

crates/ewwii/src/widgets/widget_definitions.rs

@@ -1818,6 +1818,10 @@ pub(super) fn build_gtk_input(
             widget.set_text(&value);
         }
 
+        if let Ok(value) = get_string_prop(&props, "placeholder", None) {
+            widget.set_placeholder_text(Some(&value));
+        }
+
         let timeout = get_duration_prop(&props, "timeout", Some(Duration::from_millis(200)))?;
 
         if let Ok(onchange) = get_string_prop(&props, "onchange", None) {