Fix Windows path handling in diagnostic relativization

Canonicalize `current_dir()` to match canonicalized file paths (avoids
`\\?\` prefix mismatch on Windows), and normalize backslashes to
forward slashes in relative diagnostic paths.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

ruby/extractor/src/extractor.rs

@@ -94,7 +94,7 @@ pub fn run(options: Options) -> std::io::Result<()> {
         node_types::read_node_types_str("erb", tree_sitter_embedded_template::NODE_TYPES)?;
     let lines: std::io::Result<Vec<String>> = std::io::BufReader::new(file_list).lines().collect();
     let lines = lines?;
-    let source_root = std::env::current_dir().ok();
+    let source_root = std::env::current_dir().ok().and_then(|d| d.canonicalize().ok());
     lines
         .par_iter()
         .try_for_each(|line| {

shared/tree-sitter-extractor/src/extractor/mod.rs

@@ -298,7 +298,9 @@ pub fn extract(
     yeast_runner: Option<&yeast::Runner<'_>>,
 ) {
     let path_str = file_paths::normalize_and_transform_path(path, transformer);
-    let source_root = std::env::current_dir().ok();
+    let source_root = std::env::current_dir()
+        .ok()
+        .and_then(|d| d.canonicalize().ok());
     let diagnostics_path = file_paths::relativize_for_diagnostic(path, source_root.as_deref());
     let span = tracing::span!(
         tracing::Level::TRACE,

shared/tree-sitter-extractor/src/file_paths.rs

@@ -11,7 +11,7 @@ pub fn relativize_for_diagnostic(path: &Path, source_root: Option<&Path>) -> Str
     source_root
         .and_then(|root| path.strip_prefix(root).ok())
         .and_then(|rel| rel.to_str())
-        .map(|s| s.to_owned())
+        .map(|s| s.replace('\\', "/"))
         .unwrap_or_else(|| path.display().to_string())
 }