fix(web): diagnose personal-report schema failures and ISO list timestamps

Keep report_schema_invalid for the user, but record the inner check, retry plan bind once, and format self-hosted timestamptz so the report list no longer shows 时间未知.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/tests/local-postgres-query-value.test.ts

@@ -0,0 +1,23 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { queryValue } from "../src/lib/db/local-postgres-client-core.ts";
+
+test("queryValue keeps calendar dates in local civil form", () => {
+  assert.equal(queryValue("date", new Date(2026, 7, 22)), "2026-08-22");
+});
+
+test("queryValue projects timestamptz and timestamp Date values as ISO strings", () => {
+  const instant = new Date("2026-08-22T12:34:56.000Z");
+  assert.equal(queryValue("timestamptz", instant), "2026-08-22T12:34:56.000Z");
+  assert.equal(queryValue("timestamp", instant), "2026-08-22T12:34:56.000Z");
+  assert.equal(queryValue("timestamp with time zone", instant), "2026-08-22T12:34:56.000Z");
+  assert.equal(queryValue("timestamp without time zone", instant), "2026-08-22T12:34:56.000Z");
+});
+
+test("queryValue leaves non-date values unchanged", () => {
+  assert.equal(queryValue("timestamptz", "2026-08-22T12:34:56.000Z"), "2026-08-22T12:34:56.000Z");
+  assert.equal(queryValue("text", "hello"), "hello");
+  const leftover = new Date("2026-08-22T12:34:56.000Z");
+  assert.equal(queryValue("unknown", leftover), leftover);
+});