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>

lib/report-ui.ts

@@ -10,6 +10,11 @@ const muted = { color: "var(--qai-ink-muted)" };
 const small = { fontSize: "var(--qai-text-xs)", color: "var(--qai-ink-muted)" };
 const disp = { fontFamily: "var(--qai-font-display)" };
 
+// Model output is untrusted: the schema says a number is optional, models still send null, and one throw
+// deletes the whole block from the report. 0 is the honest stand-in for "the model did not give a number".
+const num = (v: unknown) => (typeof v === "number" && Number.isFinite(v) ? v : 0);
+const conf = (v: unknown) => (typeof v === "number" ? ` ${v.toFixed(2)}` : " not reported");
+
 const renderers: Record<string, (x: any) => any> = {
   Headline: ({ props }) => el("header", null,
     el("p", { className: "label" }, props.severity === "critical" ? "Critical" : props.severity === "warning" ? "Warning" : "Note"),
@@ -50,14 +55,14 @@ const renderers: Record<string, (x: any) => any> = {
     props.caption ? el("p", { style: small }, props.caption) : null),
 
   ScoreBar: ({ props }) => el("div", null,
-    el("p", { className: "label" }, props.label + (props.confidence !== undefined
-      ? ` · confidence ${props.confidence.toFixed(2)}` : " · no confidence reported")),
-    el("div", { className: "bar", style: { width: `${Math.round(props.value * 100)}%` } }),
+    el("p", { className: "label" }, props.label + (props.confidence === undefined
+      ? " · no confidence reported" : ` · confidence${conf(props.confidence)}`)),
+    el("div", { className: "bar", style: { width: `${Math.round(num(props.value) * 100)}%` } }),
     props.note ? el("p", { style: small }, props.note) : null),
 
   OptionRow: ({ props }) => el("tr", { "data-headline": props.headline || undefined },
     el("td", null, String(props.rank)), el("td", null, props.title),
-    el("td", { className: "sql" }, props.composite.toFixed(2)),
+    el("td", { className: "sql" }, num(props.composite).toFixed(2)),
     el("td", null, props.flags || "—")),
 
   OptionTable: ({ props, renderNode }: any) => el("section", { className: "card" },
@@ -67,7 +72,7 @@ const renderers: Record<string, (x: any) => any> = {
 
   VerdictBlock: ({ props }) => el("section", { className: "card", "data-verdict": "" },
     el("p", { className: "label" }, "First move · " + (props.source === "jev"
-      ? `Jev, confidence ${props.confidence.toFixed(2)}` : "composite order — Jev did not decide")),
+      ? `Jev, confidence${conf(props.confidence)}` : "composite order — Jev did not decide")),
     p({ ...disp, fontSize: "var(--qai-text-lg)" }, props.headline),
     p({}, props.why)),