view-data: also wrap VARCHAR[] and TIMESTAMP columns; add app/error.tsx boundary

The CAST-to-VARCHAR patch wasn't enough — `[view-data] readRows
failed` still surfaced in the deploy logs with the new SQL. The
remaining unwrapped columns in eval_results_view.r.* are two
VARCHAR[] (evaluator_relationships, reporting_orgs) and four
TIMESTAMP columns (snapshot_id, evaluation_timestamp,
benchmark_updated, retrieved_timestamp). Wrap the lists with
to_json+CAST and the timestamps with a plain CAST to VARCHAR so
nothing the binding might choke on slips through r.*.

Also adds app/error.tsx so a transient backend error renders a
friendly retry card instead of Next.js's bare "Application error: a
client-side exception has occurred" overlay — useful during cold
parquet warm-up if any request still fails before the cache is
hydrated.

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

app/error.tsx

@@ -0,0 +1,100 @@
+"use client"
+
+import { useEffect } from "react"
+
+/**
+ * Top-level error boundary for every route under app/. Next.js renders
+ * this when a server component throws or a client render exception
+ * escapes the closest boundary. Replaces the bare default
+ * "Application error: a client-side exception has occurred" overlay
+ * with a recoverable affordance so a transient backend hiccup (cold
+ * parquet cache, slow first query) doesn't strand the reader on an
+ * unfriendly screen.
+ */
+export default function RouteError({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string }
+  reset: () => void
+}) {
+  useEffect(() => {
+    if (typeof window !== "undefined" && "console" in window) {
+      console.error("[route-error]", error)
+    }
+  }, [error])
+
+  return (
+    <div
+      style={{
+        minHeight: "60vh",
+        display: "flex",
+        alignItems: "center",
+        justifyContent: "center",
+        padding: "24px",
+      }}
+    >
+      <div
+        style={{
+          maxWidth: 460,
+          width: "100%",
+          padding: "28px 28px 24px",
+          border: "1px solid var(--border-soft)",
+          background: "var(--bg)",
+        }}
+      >
+        <div
+          className="font-mono uppercase"
+          style={{
+            fontSize: 10,
+            letterSpacing: "0.18em",
+            color: "var(--fg-subtle)",
+            marginBottom: 14,
+          }}
+        >
+          Something went wrong
+        </div>
+        <p
+          style={{
+            margin: 0,
+            color: "var(--fg)",
+            fontSize: 15,
+            lineHeight: 1.55,
+          }}
+        >
+          We couldn't load this view. The data backend may still be
+          warming up — most cold-start hiccups clear within a few
+          seconds.
+        </p>
+        <div
+          style={{
+            display: "flex",
+            gap: 10,
+            marginTop: 20,
+            flexWrap: "wrap",
+          }}
+        >
+          <button type="button" className="btn-ec" onClick={() => reset()}>
+            Try again
+          </button>
+          <a href="/" className="btn-ec outline">
+            Back to home
+          </a>
+        </div>
+        {error.digest && (
+          <div
+            className="font-mono"
+            style={{
+              marginTop: 18,
+              fontSize: 10,
+              color: "var(--fg-subtle)",
+              wordBreak: "break-all",
+            }}
+          >
+            ref: {error.digest}
+          </div>
+        )}
+      </div>
+    </div>
+  )
+}

lib/view-data.ts

@@ -102,7 +102,13 @@ const CELL_JOIN_COLUMNS = `
     CAST(to_json(r.eval_library) AS VARCHAR) AS eval_library,
     CAST(to_json(r.aggregate_components) AS VARCHAR) AS aggregate_components,
     CAST(to_json(r.evalcards_annotations) AS VARCHAR) AS evalcards_annotations,
-    CAST(to_json(r.scores_by_organization) AS VARCHAR) AS scores_by_organization
+    CAST(to_json(r.scores_by_organization) AS VARCHAR) AS scores_by_organization,
+    CAST(to_json(r.evaluator_relationships) AS VARCHAR) AS evaluator_relationships,
+    CAST(to_json(r.reporting_orgs) AS VARCHAR) AS reporting_orgs,
+    CAST(r.snapshot_id AS VARCHAR) AS snapshot_id,
+    CAST(r.evaluation_timestamp AS VARCHAR) AS evaluation_timestamp,
+    CAST(r.benchmark_updated AS VARCHAR) AS benchmark_updated,
+    CAST(r.retrieved_timestamp AS VARCHAR) AS retrieved_timestamp
   ),
   e.evaluation_name AS eval_evaluation_name,
   e.canonical_display_name AS eval_canonical_display_name,