feat: add word wrap toggle functionality

Add the ability to toggle word wrap in the text editor with Alt+Z.
Word wrap can be enabled or disabled, affecting how long lines are
displayed in edit mode.

Changes:
- Add `is_word_wrap_on` state field with default value of false
- Implement `toggle_word_wrap()` and `is_word_wrap_on()` methods
- Add ToggleWordWrap variant to ViewAction enum
- Bind Alt+Z keyboard shortcut to toggle word wrap
- Refactor editor view to support dynamic wrapping behavior
  - Use responsive widget when wrap is enabled to constrain width
  - Apply Wrapping::WordOrGlyph when enabled, Wrapping::None otherwise
- Update editor view signature to accept word wrap state parameter
- Fix indentation inconsistencies in file.rs and state.rs

src/message.rs

@@ -39,6 +39,7 @@ pub enum ViewAction {
   Decrease,
   Reset,
   TogglePreview,
+  ToggleWordWrap,
 }
 
 impl ViewAction {
@@ -47,6 +48,7 @@ impl ViewAction {
     ViewAction::Decrease,
     ViewAction::Reset,
     ViewAction::TogglePreview,
+    ViewAction::ToggleWordWrap,
   ];
 }
 
@@ -57,6 +59,7 @@ impl Display for ViewAction {
       ViewAction::Increase => write!(f, "Increase font"),
       ViewAction::Reset => write!(f, "Reset font"),
       ViewAction::TogglePreview => write!(f, "Toggle preview"),
+      ViewAction::ToggleWordWrap => write!(f, "Toggle word wrap"),
     }
   }
 }