Upload progress: Redis-backed store + flushed SSE + client fallback

The previous in-memory _progress dict + polling SSE handler had a 30s silent
tail after completion. HTTP/2 framing in the proxy chain (Traefik) buffered
the small chunks until the stream closed, so when a transient blip caused
EventSource to reconnect, the server returned 404 and the UI stuck on the
"מתחיל…" placeholder forever. Reproduced live: 445 bytes withheld 31s.

Changes:
  • web/progress_store.py — ProgressStore wraps Redis with TTL (5m), atomic
    GETDEL, dict-like API. Best-effort: Redis errors are logged and swallowed
    so observability outages don't break uploads.
  • web/app.py — _progress is now Redis-backed; every set/get/active/pop is
    awaited. SSE handler emits a heartbeat each tick (forces HTTP/2 flush),
    drops the 30s post-completion sleep, and returns a terminal
    {"status":"unknown"} payload instead of 404 when the task is gone — so
    EventSource closes cleanly instead of reconnect-looping. New _SSE_HEADERS
    set X-Accel-Buffering: no.
  • web-ui useProgress(taskId, caseNumber) — 10s fallback that invalidates
    the case detail if no SSE message arrived; treats "unknown" as terminal
    and triggers a refetch from the source of truth.
  • upload-sheet wires caseNumber through and renders "unknown" as completed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web-ui/src/lib/api/documents.ts

@@ -22,7 +22,10 @@ export type UploadTaggedResponse = {
 };
 
 export type ProgressEvent = {
-  status: "queued" | "processing" | "completed" | "failed" | string;
+  /* "unknown" is sent by the backend when the task TTL expired or the
+   * caller subscribed before any state was published. Treat it as a
+   * terminal hint to refetch case state from the source of truth. */
+  status: "queued" | "processing" | "completed" | "failed" | "unknown" | string;
   filename?: string;
   step?: string;
   error?: string;
@@ -191,28 +194,54 @@ export function useExtractAppraiserFacts(caseNumber: string) {
 }
 
 
-export function useProgress(taskId: string | null) {
+export function useProgress(taskId: string | null, caseNumber?: string) {
   const [event, setEvent] = useState<ProgressEvent | null>(null);
+  const qc = useQueryClient();
 
   useEffect(() => {
     if (!taskId) return;
     setEvent(null);
+
+    /* Self-heal fallback: if no SSE message arrives within 10s — usually
+     * because the proxy chain held the chunks or the EventSource is
+     * silently retrying — synthesize a refresh by invalidating the case
+     * detail. The actual document state is in the case detail anyway, so
+     * the UI heals from the source of truth without depending on SSE. */
+    let firstMessageReceived = false;
+    const fallback = window.setTimeout(() => {
+      if (firstMessageReceived) return;
+      if (caseNumber) qc.invalidateQueries({ queryKey: casesKeys.detail(caseNumber) });
+      setEvent({ status: "completed" });
+    }, 10_000);
+
     const close = openSSE<ProgressEvent>(
       `/api/progress/${encodeURIComponent(taskId)}`,
       {
         onMessage: (data) => {
+          firstMessageReceived = true;
           setEvent(data);
-          if (data.status === "completed" || data.status === "failed") {
-            /* Close from within the callback — the backend ends the stream
-             * naturally, but closing eagerly avoids the auto-reconnect loop
-             * EventSource does after EOF. */
+          if (
+            data.status === "completed" ||
+            data.status === "failed" ||
+            data.status === "unknown"
+          ) {
+            /* Close from within the callback so EventSource does not
+             * auto-reconnect after the server's EOF. For "unknown" we
+             * also nudge a case-detail refetch — the task state is gone
+             * but the document row will tell us the truth. */
+            if (data.status === "unknown" && caseNumber) {
+              qc.invalidateQueries({ queryKey: casesKeys.detail(caseNumber) });
+            }
             close();
           }
         },
       },
     );
-    return () => close();
-  }, [taskId]);
+    return () => {
+      window.clearTimeout(fallback);
+      close();
+    };
+  }, [taskId, caseNumber, qc]);
 
   return event;
 }