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/file.rs

@@ -93,12 +93,12 @@ impl File {
       .map(|p| p.to_string_lossy().to_string())
       .unwrap_or_default()
   }
-  
-  pub fn needs_saving(&self) ->  bool {
-      self.needs_saving
+
+  pub fn needs_saving(&self) -> bool {
+    self.needs_saving
   }
 
   pub fn set_needs_saving(&mut self, state: bool) {
-      self.needs_saving = state
+    self.needs_saving = state
   }
 }