gpui: Add line_clamp to truncate text after a specified number of lines (#23058)

Release Notes:

- N/A

Add this feature for some case we need keep 2 or 3 lines, but truncate.
For example the blog post summary.

- Added `line_clamp` method.
    Ref: https://tailwindcss.com/docs/line-clamp


## Break changes:

- Renamed `gpui::Truncate` to `gpui::TextOverflow` to match
[CSS](https://developer.mozilla.org/en-US/docs/Web/CSS/text-overflow).
- Update `truncate` style method to match [Tailwind
CSS](https://tailwindcss.com/docs/text-overflow) behavior:

    ```css
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    ```
<img width="538" alt="image"
src="https://github.com/user-attachments/assets/c69c4213-eac9-4087-9daa-ce7afe18c758"
/>


## Show case

<img width="816" alt="image"
src="https://github.com/user-attachments/assets/e0660290-8042-4954-b93c-c729d609484a"
/>

![CleanShot 2025-01-13 at 17 22
05](https://github.com/user-attachments/assets/38644892-79fe-4254-af9e-88c1349561bd)

## Describe changes

The [second
commit](6b41c2772f)
for make sure text layout to match with the line clamp. Before this
change, they may wrap many lines in sometimes. And I also make
line_clamp default to 1 if we used `truncate` to ensure no wrap.

> TODO: There is still a tiny detail that is not easy to fix. This
problem only occurs in the case of certain long words. I will think
about how to improve it later. At present, this has some flaws but does
not affect the use.

crates/language_models/src/provider/anthropic.rs

@@ -647,11 +647,8 @@ impl ConfigurationView {
             font_weight: settings.ui_font.weight,
             font_style: FontStyle::Normal,
             line_height: relative(1.3),
-            background_color: None,
-            underline: None,
-            strikethrough: None,
             white_space: WhiteSpace::Normal,
-            truncate: None,
+            ..Default::default()
         };
         EditorElement::new(
             &self.api_key_editor,

crates/language_models/src/provider/deepseek.rs

@@ -466,7 +466,7 @@ impl ConfigurationView {
             underline: None,
             strikethrough: None,
             white_space: WhiteSpace::Normal,
-            truncate: None,
+            ..Default::default()
         };
         EditorElement::new(
             &self.api_key_editor,

crates/language_models/src/provider/google.rs

@@ -409,11 +409,8 @@ impl ConfigurationView {
             font_weight: settings.ui_font.weight,
             font_style: FontStyle::Normal,
             line_height: relative(1.3),
-            background_color: None,
-            underline: None,
-            strikethrough: None,
             white_space: WhiteSpace::Normal,
-            truncate: None,
+            ..Default::default()
         };
         EditorElement::new(
             &self.api_key_editor,

crates/language_models/src/provider/open_ai.rs

@@ -458,11 +458,8 @@ impl ConfigurationView {
             font_weight: settings.ui_font.weight,
             font_style: FontStyle::Normal,
             line_height: relative(1.3),
-            background_color: None,
-            underline: None,
-            strikethrough: None,
             white_space: WhiteSpace::Normal,
-            truncate: None,
+            ..Default::default()
         };
         EditorElement::new(
             &self.api_key_editor,