git_ui: Prevent button overflow due to long names (#25940)

- Fix component preview widths for git panel
- Fix buttons getting pushed off the screen in git  panel

Release Notes:

- N/A

---------

Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>

crates/ui/src/components/label/label_like.rs

@@ -57,7 +57,7 @@ pub trait LabelCommon {
     fn alpha(self, alpha: f32) -> Self;
 
     /// Truncates overflowing text with an ellipsis (`…`) if needed.
-    fn text_ellipsis(self) -> Self;
+    fn truncate(self) -> Self;
 
     /// Sets the label to render as a single line.
     fn single_line(self) -> Self;
@@ -84,7 +84,7 @@ pub struct LabelLike {
     alpha: Option<f32>,
     underline: bool,
     single_line: bool,
-    text_ellipsis: bool,
+    truncate: bool,
 }
 
 impl Default for LabelLike {
@@ -109,7 +109,7 @@ impl LabelLike {
             alpha: None,
             underline: false,
             single_line: false,
-            text_ellipsis: false,
+            truncate: false,
         }
     }
 }
@@ -166,8 +166,9 @@ impl LabelCommon for LabelLike {
         self
     }
 
-    fn text_ellipsis(mut self) -> Self {
-        self.text_ellipsis = true;
+    /// Truncates overflowing text with an ellipsis (`…`) if needed.
+    fn truncate(mut self) -> Self {
+        self.truncate = true;
         self
     }
 
@@ -220,7 +221,7 @@ impl RenderOnce for LabelLike {
             })
             .when(self.strikethrough, |this| this.line_through())
             .when(self.single_line, |this| this.whitespace_nowrap())
-            .when(self.text_ellipsis, |this| {
+            .when(self.truncate, |this| {
                 this.overflow_x_hidden().text_ellipsis()
             })
             .text_color(color)