dev: fix lint warnings introduced by #2062 (#2096)

> Hm. Sorry about the lint failures here, they slipped my attention
locally since they show up as warnings, not errors, in my editor. I'm
happy to put a PR fixing them later unless you get to it first.
>
> Not too sure how to deal with the unused DiagWorker::check method,
since it is used, just in a test-only module. We can certainly mark it
as #[cfg(test)] but that feels a little nasty.


https://github.com/Myriad-Dreamin/tinymist/pull/2062#issuecomment-3237812684

I ended up inlining the logic of `DiagWorker::check` into the test.

crates/tinymist-query/src/check.rs

@@ -14,6 +14,6 @@ impl SemanticRequest for CheckRequest {
 
     fn request(self, ctx: &mut LocalContext) -> Option<Self::Response> {
         let worker = DiagWorker::new(ctx);
-        Some(worker.full_check().convert_all(self.snap.diagnostics()))
+        Some(worker.check().convert_all(self.snap.diagnostics()))
     }
 }

crates/tinymist-query/src/code_action.rs

@@ -126,14 +126,20 @@ mod tests {
         source: &Source,
         request_range: &LspRange,
     ) -> CodeActionContext {
-        let Warned { output, warnings } = typst::compile::<PagedDocument>(&ctx.world);
-        let errors = output.err().unwrap_or_default();
-        let compiler_diagnostics = warnings.iter().chain(errors.iter());
+        let Warned {
+            output,
+            warnings: compiler_warnings,
+        } = typst::compile::<PagedDocument>(&ctx.world);
+        let compiler_errors = output.err().unwrap_or_default();
 
-        // Run the linter for additional diagnostics as well.
+        let lint_warnings = ctx.lint(source);
         let diagnostics = DiagWorker::new(ctx)
-            .check(source)
-            .convert_all(compiler_diagnostics)
+            .convert_all(
+                compiler_errors
+                    .iter()
+                    .chain(compiler_warnings.iter())
+                    .chain(lint_warnings.iter()),
+            )
             .into_values()
             .flatten();
 

crates/tinymist-query/src/diagnostics.rs

@@ -46,16 +46,8 @@ impl<'w> DiagWorker<'w> {
         }
     }
 
-    /// Runs code check on the given document.
-    pub fn check(mut self, source: &Source) -> Self {
-        for diag in self.ctx.lint(&source) {
-            self.handle(&diag);
-        }
-        self
-    }
-
     /// Runs code check on the main document and all its dependencies.
-    pub fn full_check(mut self) -> Self {
+    pub fn check(mut self) -> Self {
         for dep in self.ctx.world.depended_files() {
             if WorkspaceResolver::is_package_file(dep) {
                 continue;