Another batch of lint fixes (#36521)

- **Enable a bunch of extra lints**
- **First batch of fixes**
- **More fixes**

Release Notes:

- N/A

crates/agent_ui/src/agent_diff.rs

@@ -322,16 +322,14 @@ impl AgentDiffPane {
     }
 
     fn handle_native_thread_event(&mut self, event: &ThreadEvent, cx: &mut Context<Self>) {
-        match event {
-            ThreadEvent::SummaryGenerated => self.update_title(cx),
-            _ => {}
+        if let ThreadEvent::SummaryGenerated = event {
+            self.update_title(cx)
         }
     }
 
     fn handle_acp_thread_event(&mut self, event: &AcpThreadEvent, cx: &mut Context<Self>) {
-        match event {
-            AcpThreadEvent::TitleUpdated => self.update_title(cx),
-            _ => {}
+        if let AcpThreadEvent::TitleUpdated = event {
+            self.update_title(cx)
         }
     }
 
@@ -1541,15 +1539,11 @@ impl AgentDiff {
         window: &mut Window,
         cx: &mut Context<Self>,
     ) {
-        match event {
-            workspace::Event::ItemAdded { item } => {
-                if let Some(editor) = item.downcast::<Editor>()
-                    && let Some(buffer) = Self::full_editor_buffer(editor.read(cx), cx)
-                {
-                    self.register_editor(workspace.downgrade(), buffer.clone(), editor, window, cx);
-                }
-            }
-            _ => {}
+        if let workspace::Event::ItemAdded { item } = event
+            && let Some(editor) = item.downcast::<Editor>()
+            && let Some(buffer) = Self::full_editor_buffer(editor.read(cx), cx)
+        {
+            self.register_editor(workspace.downgrade(), buffer.clone(), editor, window, cx);
         }
     }