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/handler.rs

@@ -76,6 +76,7 @@ pub fn view_action(state: &mut State, action: ViewAction) -> Task<Message> {
     ViewAction::Decrease => state.decrease_font(),
     ViewAction::Reset => state.reset_font(),
     ViewAction::TogglePreview => state.toggle_preview(),
+    ViewAction::ToggleWordWrap => state.toggle_word_wrap(),
   }
 
   Task::none()