feat(fetch-requests): support llama_parse pipeline

- Fix PipelineType union: "llama_parser" → "llama_parse" (matches backend enum)
- Add "llama_extract" to SSEEventStep union
- PipelineStepper: advance Extract stage on llama_extract events

Dropdown/badge rendering is OpenAPI-spec-driven and picks the new value up
automatically; no other changes required.

src/FetchRequest/components/PipelineStepper.tsx

@@ -29,7 +29,13 @@ function computeProgressPercent(
 
   let pct = 0;
 
-  if (seenSteps.has("raw_lines") || seenSteps.has("txn_blocks")) pct += 10;
+  if (
+    seenSteps.has("raw_lines") ||
+    seenSteps.has("txn_blocks") ||
+    seenSteps.has("llama_extract")
+  ) {
+    pct += 10;
+  }
 
   if (txnBlockCount > 0) {
     const current = Math.max(liveCount, stepStats.txn_dicts ?? 0);