Fix a bunch of other low-hanging style lints (#36498)

- **Fix a bunch of low hanging style lints like unnecessary-return**
- **Fix single worktree violation**
- **And the rest**

Release Notes:

- N/A

crates/assistant_tools/src/assistant_tools.rs

@@ -86,7 +86,7 @@ fn register_web_search_tool(registry: &Entity<LanguageModelRegistry>, cx: &mut A
     let using_zed_provider = registry
         .read(cx)
         .default_model()
-        .map_or(false, |default| default.is_provided_by_zed());
+        .is_some_and(|default| default.is_provided_by_zed());
     if using_zed_provider {
         ToolRegistry::global(cx).register_tool(WebSearchTool);
     } else {