fix(bar): use truncated labels for titles

This commit introduces a new wrapper, CustomUi, which is used to
implement custom methods on top of eframe::egui::Ui.

The default ui::add_sized method always has the text in a label
centered, which is not desirable for a status bar where the layout
should be ltr.

A new function CustomUi::add_sized_left_to_right has been added to
ensure that labels can be truncated with a custom width (which requires
allocate_ui_with_layout), while also retaining the ability for the text
to be aligned to the left rather than the center of the allocated
layout.

komorebi-bar/src/config.rs

@@ -21,6 +21,8 @@ pub struct KomobarConfig {
     pub font_family: Option<String>,
     /// Font size (default: 12.5)
     pub font_size: Option<f32>,
+    /// Max label width before text truncation (default: 400.0)
+    pub max_label_width: Option<f32>,
     /// Theme
     pub theme: Option<KomobarTheme>,
     /// Left side widgets (ordered left-to-right)