Move files in preparation for monorepo migration

apps/theseus_gui/src-tauri/src/error.rs

@@ -0,0 +1,18 @@
+use tracing_error::ExtractSpanTrace;
+
+pub fn display_tracing_error(err: &theseus::Error) {
+    match get_span_trace(err) {
+        Some(span_trace) => {
+            tracing::error!(error = %err, span_trace = %span_trace);
+        }
+        None => {
+            tracing::error!(error = %err);
+        }
+    }
+}
+
+pub fn get_span_trace<'a>(
+    error: &'a (dyn std::error::Error + 'static),
+) -> Option<&'a tracing_error::SpanTrace> {
+    error.source().and_then(|e| e.span_trace())
+}