fix: final review pass — email collision, orphaned-run loop, null confidence guards

- changeEmail validates and refuses an address another account owns (users.email is UNIQUE; a collision was a 500 inside the settings form).
- /app/[id] no longer redirects a 'running' row to itself; it renders what exists and says the run was interrupted.
- ScoreBar / OptionRow / VerdictBlock survive null numbers from the model instead of throwing and losing the block (seen live: '[openui] runtime/render-error: Component ScoreBar render failed').
- drop the ad-hoc render-debug scripts now that Playwright covers the browser.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/app/[id]/page.tsx

@@ -1,4 +1,4 @@
-import { notFound, redirect } from "next/navigation";
+import { notFound } from "next/navigation";
 import { requireUser } from "@/lib/auth";
 import { getAnalysis } from "@/lib/db";
 import { ReportView } from "@/components/report-view";
@@ -9,9 +9,13 @@ export default async function Stored({ params }: { params: Promise<{ id: string
   const u = await requireUser();
   const a = getAnalysis((await params).id, u.id);
   if (!a) notFound();
-  if (a.status === "running") redirect(`/app/${a.id}`);   // still streaming elsewhere; rare, bounce once
+  // Never redirect here: a row left "running" by a crashed process would bounce this page to itself forever.
+  const interrupted = a.status === "running";
   return <main style={{ display: "grid", gap: "var(--qai-space-xl)" }}>
     <h1 style={{ fontFamily: "var(--qai-font-display)", fontSize: "var(--qai-text-2xl)", margin: 0 }}>{a.title}</h1>
+    {interrupted && <p role="alert" style={{ color: "var(--qai-warn)" }}>
+      This run was interrupted before it finished — what is below is everything it managed to produce.
+    </p>}
     {a.error && <p role="alert" style={{ color: "var(--qai-danger)" }}>{a.error}</p>}
     {a.verdict && <VerdictSummary verdict={JSON.parse(a.verdict)} />}
     {a.oul ? <><ExportButtons oul={a.oul} title={a.title} /><ReportView oul={a.oul} streaming={false} /></>