fix: keep cold Find Work reliable across workers (Closes #695)

src/main.py

@@ -2767,14 +2767,18 @@ async def _available_issue_snapshot() -> tuple[list[dict], bool, bool, bool]:
     if _available_issue_snapshot_value is not None:
         return _available_issue_snapshot_value, True, True, False
     if not local_refresh:
-        for _ in range(50):
+        wait_deadline = time.monotonic() + WORK_PAGE_TIMEOUT_SECONDS
+        while time.monotonic() < wait_deadline:
             await asyncio.sleep(0.02)
             shared = await asyncio.to_thread(_available_issue_snapshot_store.load)
             if shared.items is not None:
                 return shared.items, False, False, False
             if not shared.refreshing:
-                break
-        raise RuntimeError("available issue catalog refresh is owned by another worker")
+                local_refresh = await _start_available_issue_refresh()
+                if local_refresh:
+                    break
+        if not local_refresh:
+            raise RuntimeError("available issue catalog refresh is owned by another worker")
     try:
         return await asyncio.shield(_available_issue_snapshot_task), False, False, False
     except Exception: