chore(polish): integrate toasts, reports paging, loading motion; login centring floor for short windows; load-more uses notifyError; round records

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE

frontend/src/components/personal-report/personal-report-center.tsx

@@ -4,7 +4,7 @@ import { AppLink } from "@/components/app-link";
 import { FileText, RefreshCw } from "lucide-react";
 import { InlineSpinner } from "@/components/inline-spinner";
 import { useCallback, useEffect, useRef, useState } from "react";
-import { toast } from "sonner";
+import { notifyError } from "@/lib/notify";
 
 import { SecondaryPageShell } from "@/components/secondary-page-shell";
 import { readCurrentSubjectScope, useCurrentSubjectScope, useCurrentSubjectReady } from "@/lib/current-subject";
@@ -172,10 +172,10 @@ export function PersonalReportCenter() {
         const fresh = page.reports.filter(report => !deletedIds.current.has(report.id));
         setState(current => ({ ...current, reports: appendReportPage(current.reports, fresh), nextCursor: page.nextCursor, extended: true }));
       } else {
-        toast.error("更早的报告没读出来，再试一次。");
+        notifyError("更早的报告没读出来，再试一次。", { id: "reports-load-more" });
       }
     } catch {
-      if (!cancelled.current) toast.error("更早的报告没读出来，再试一次。");
+      if (!cancelled.current) notifyError("更早的报告没读出来，再试一次。", { id: "reports-load-more" });
     } finally {
       if (!cancelled.current) setLoadingMore(false);
     }