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_slash_commands/src/context_server_command.rs

@@ -62,9 +62,10 @@ impl SlashCommand for ContextServerSlashCommand {
     }
 
     fn requires_argument(&self) -> bool {
-        self.prompt.arguments.as_ref().map_or(false, |args| {
-            args.iter().any(|arg| arg.required == Some(true))
-        })
+        self.prompt
+            .arguments
+            .as_ref()
+            .is_some_and(|args| args.iter().any(|arg| arg.required == Some(true)))
     }
 
     fn complete_argument(

crates/assistant_slash_commands/src/diagnostics_command.rs

@@ -61,7 +61,7 @@ impl DiagnosticsSlashCommand {
                         snapshot: worktree.snapshot(),
                         include_ignored: worktree
                             .root_entry()
-                            .map_or(false, |entry| entry.is_ignored),
+                            .is_some_and(|entry| entry.is_ignored),
                         include_root_name: true,
                         candidates: project::Candidates::Entries,
                     }

crates/assistant_slash_commands/src/file_command.rs

@@ -92,7 +92,7 @@ impl FileSlashCommand {
                         snapshot: worktree.snapshot(),
                         include_ignored: worktree
                             .root_entry()
-                            .map_or(false, |entry| entry.is_ignored),
+                            .is_some_and(|entry| entry.is_ignored),
                         include_root_name: true,
                         candidates: project::Candidates::Entries,
                     }
@@ -536,7 +536,7 @@ mod custom_path_matcher {
             let path_str = path.to_string_lossy();
             let separator = std::path::MAIN_SEPARATOR_STR;
             if path_str.ends_with(separator) {
-                return false;
+                false
             } else {
                 self.glob.is_match(path_str.to_string() + separator)
             }