chore: enable clippy::redundant_clone (#3489)

Created this PR by:

- adding `redundant_clone` to `[workspace.lints.clippy]` in
`cargo-rs/Cargol.toml`
- running `cargo clippy --tests --fix`
- running `just fmt`

Though I had to clean up one instance of the following that resulted:

```rust
let codex = codex;
```

codex-rs/tui/src/chatwidget.rs

@@ -574,14 +574,14 @@ impl ChatWidget {
                 self.active_exec_cell = Some(history_cell::new_active_exec_command(
                     ev.call_id.clone(),
                     ev.command.clone(),
-                    ev.parsed_cmd.clone(),
+                    ev.parsed_cmd,
                 ));
             }
         } else {
             self.active_exec_cell = Some(history_cell::new_active_exec_command(
                 ev.call_id.clone(),
                 ev.command.clone(),
-                ev.parsed_cmd.clone(),
+                ev.parsed_cmd,
             ));
         }
 
@@ -804,7 +804,7 @@ impl ChatWidget {
             "attach_image path={path:?} width={width} height={height} format={format_label}",
         );
         self.bottom_pane
-            .attach_image(path.clone(), width, height, format_label);
+            .attach_image(path, width, height, format_label);
         self.request_redraw();
     }
 
@@ -986,7 +986,7 @@ impl ChatWidget {
 
         // Only show the text portion in conversation history.
         if !text.is_empty() {
-            self.add_to_history(history_cell::new_user_prompt(text.clone()));
+            self.add_to_history(history_cell::new_user_prompt(text));
         }
     }
 
@@ -1055,10 +1055,10 @@ impl ChatWidget {
             EventMsg::PlanUpdate(update) => self.on_plan_update(update),
             EventMsg::ExecApprovalRequest(ev) => {
                 // For replayed events, synthesize an empty id (these should not occur).
-                self.on_exec_approval_request(id.clone().unwrap_or_default(), ev)
+                self.on_exec_approval_request(id.unwrap_or_default(), ev)
             }
             EventMsg::ApplyPatchApprovalRequest(ev) => {
-                self.on_apply_patch_approval_request(id.clone().unwrap_or_default(), ev)
+                self.on_apply_patch_approval_request(id.unwrap_or_default(), ev)
             }
             EventMsg::ExecCommandBegin(ev) => self.on_exec_command_begin(ev),
             EventMsg::ExecCommandOutputDelta(delta) => self.on_exec_command_output_delta(delta),