fix(copy): make delete confirmations, sleep-debt labels, and the glucose band honest

Three surfaces where the words no longer matched the code, plus the missing
web control for a preference the server already honours.

Delete confirmations. Four dialogs promised permanence on surfaces that
render an Undo: the measurements and mood bulk bodies, the lab-result body,
and the illness-episode body (which said "cannot be undone" sixty lines
below the code that fires the Undo toast). All four now use the same
sentence the single-row measurement and mood dialogs already used. A sweep
of every other confirmation in the tree found the rest accurate — the
biomarker cascade, the mood-tag purge, and the account purge keep their
warning because those deletes really are unrecoverable.

Sleep debt. v1.19.0 replaced the summed shortfall with a running balance
that credits catch-up sleep; the labels still described the old sum, so the
word contradicted the number for anyone who slept in after a short night.
Corrected in all six locales, plus the places the old semantics had
propagated: the Coach system prompt, the OpenAPI field descriptions the
native client reads, and four module docblocks.

Glucose reference band. `hasDiabetes` selects the tighter reference band and
grounds the Coach, but no web surface set it — a web-only account was pinned
to the non-diabetic scale with no way out. The control goes on Targets,
above the per-metric editor, because it answers the same question that page
answers and the two are ordered: it picks the default band, an override
below beats it. The copy says what it is — a reference band, not a
diagnosis, never inferred from a reading, no clinical action taken on it.

The passkey list was reported as always reading "never used". It does not
reproduce: the column is selected by the list route and stamped on every
verified assertion, both since v1.23.0. Pinned with tests on both halves so
the contract cannot quietly regress.

src/__tests__/copy-matches-behaviour-guard.test.ts

@@ -0,0 +1,219 @@
+/**
+ * Copy-matches-behaviour guard.
+ *
+ * Three classes of copy that drifted away from the code they describe, each
+ * pinned here so the pair fails loudly if either half moves again:
+ *
+ *   1. DELETE CONFIRMATIONS. A confirmation is the moment a user weighs the
+ *      consequence. Four dialogs promised permanence on surfaces that render
+ *      an Undo affordance (measurements bulk, mood bulk, labs, illness) — a
+ *      cautious user declines a safe delete, and the warning loses weight
+ *      where it is true. This test pins both directions: undo-able surfaces
+ *      must offer the undo sentence and must NOT claim finality; the
+ *      genuinely permanent ones must keep their warning.
+ *
+ *   2. SLEEP DEBT. v1.19.0 replaced the summed shortfall with a running
+ *      balance that credits surplus sleep. The labels still described the old
+ *      arithmetic, so the word contradicted the number for anyone who caught
+ *      up after a short night.
+ *
+ *   3. GLUCOSE REFERENCE BAND. The declared diabetes opt-in has a server
+ *      preference and a route; the copy for its web control must exist in
+ *      every locale, since a missing key silently degrades to the raw key on
+ *      a surface that makes a clinical-adjacent claim.
+ *
+ * Reversibility evidence for the undo-able set:
+ *   - measurements: `POST /api/measurements/restore`, undo toast in
+ *     `src/components/measurements/measurement-list.tsx`
+ *   - mood:         `POST /api/mood-entries/restore`, undo toast in
+ *     `src/components/mood/mood-list.tsx`
+ *   - labs:         `POST /api/labs/restore`, undo toast in
+ *     `src/components/labs/lab-history-list.tsx`
+ *   - illness:      `POST /api/illness/episodes/[id]/restore`, undo toast in
+ *     `src/components/illness/episode-menu.tsx`
+ */
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+import { describe, expect, it } from "vitest";
+
+const MESSAGES = join(__dirname, "../../messages");
+const LOCALES = ["de", "en", "es", "fr", "it", "pl"] as const;
+
+function bundle(locale: string): Record<string, unknown> {
+  return JSON.parse(readFileSync(join(MESSAGES, `${locale}.json`), "utf8"));
+}
+
+function resolve(obj: Record<string, unknown>, path: string): string {
+  let cur: unknown = obj;
+  for (const seg of path.split(".")) {
+    expect(cur, `${path} is missing at "${seg}"`).toBeTypeOf("object");
+    cur = (cur as Record<string, unknown>)[seg];
+  }
+  expect(typeof cur, `${path} must resolve to a string`).toBe("string");
+  return cur as string;
+}
+
+/**
+ * Per-locale phrases that assert a deletion cannot be taken back. A dialog on
+ * an undo-able surface must contain none of these.
+ */
+const FINALITY_PHRASES: Record<string, readonly string[]> = {
+  en: ["cannot be undone", "can't be undone", "permanently", "permanent"],
+  de: ["nicht rückgängig", "endgültig", "dauerhaft", "unwiderruflich"],
+  es: ["no se puede deshacer", "permanente", "irreversible"],
+  fr: [
+    "irréversible",
+    "définitivement",
+    "définitive",
+    "ne peut pas être annulé",
+  ],
+  it: [
+    "non può essere annullata",
+    "definitivamente",
+    "definitiva",
+    "permanente",
+  ],
+  pl: ["nie można cofnąć", "trwale", "nieodwracaln"],
+};
+
+/** Per-locale phrase that promises the short undo window. */
+const UNDO_PHRASES: Record<string, string> = {
+  en: "undo",
+  de: "rückgängig",
+  es: "deshacerlo",
+  fr: "annuler cette action",
+  it: "annullare",
+  pl: "cofnąć",
+};
+
+/** Confirmation bodies whose surface renders an Undo affordance. */
+const UNDOABLE_CONFIRM_KEYS = [
+  "measurements.deleteConfirmDescription",
+  "measurements.bulkDeleteConfirmBody",
+  "mood.deleteConfirmDescription",
+  "mood.bulkDeleteConfirmBody",
+  "labs.deleteConfirmDescription",
+  "illness.deleteConfirm.body",
+] as const;
+
+/**
+ * Confirmation bodies whose delete really is unrecoverable for the user —
+ * hard delete or a tombstone with no restore path. These MUST keep a
+ * finality warning; softening them would be the mirror-image bug.
+ */
+const PERMANENT_CONFIRM_KEYS = [
+  // hard delete + cascade of every recorded value
+  "labs.biomarker.deleteConfirmDescription",
+  // `?purge=true` hard-deletes the tag off every past entry
+  "mood.manage.purgeBody",
+  // GDPR Art. 17 account purge
+  "settings.deleteAccountConfirmDescription",
+] as const;
+
+describe("delete confirmations describe what the surface actually does", () => {
+  for (const locale of LOCALES) {
+    const msgs = bundle(locale);
+
+    describe(locale, () => {
+      for (const key of UNDOABLE_CONFIRM_KEYS) {
+        it(`${key} offers undo and claims no finality`, () => {
+          const copy = resolve(msgs, key).toLowerCase();
+
+          for (const phrase of FINALITY_PHRASES[locale]) {
+            expect(
+              copy,
+              `${locale}/${key} claims finality ("${phrase}") but the surface renders an Undo`,
+            ).not.toContain(phrase.toLowerCase());
+          }
+
+          expect(
+            copy,
+            `${locale}/${key} should tell the user the delete can be undone`,
+          ).toContain(UNDO_PHRASES[locale].toLowerCase());
+        });
+      }
+
+      for (const key of PERMANENT_CONFIRM_KEYS) {
+        it(`${key} keeps its finality warning`, () => {
+          const copy = resolve(msgs, key).toLowerCase();
+          const warns = FINALITY_PHRASES[locale].some((p) =>
+            copy.includes(p.toLowerCase()),
+          );
+          expect(
+            warns,
+            `${locale}/${key} deletes irrecoverably — the copy must say so`,
+          ).toBe(true);
+        });
+      }
+    });
+  }
+});
+
+describe("sleep debt is labelled as a balance, not a summed deficit", () => {
+  /**
+   * The figure is a running balance: a short night adds, a long night pays it
+   * down. Deficit/shortfall vocabulary describes the pre-v1.19.0 sum.
+   */
+  const STALE_SUM_VOCABULARY: Record<string, readonly string[]> = {
+    en: ["cumulative", "shortfall", "accumulated"],
+    de: ["kumuliert", "defizit", "aufgelaufen"],
+    es: ["acumulado", "acumulada", "déficit"],
+    fr: ["cumulé", "cumulée", "déficit"],
+    it: ["cumulato", "cumulata", "accumulato", "deficit"],
+    pl: ["skumulowan", "niedobór", "niedoboru"],
+  };
+
+  for (const locale of LOCALES) {
+    const msgs = bundle(locale);
+
+    it(`${locale} debt captions carry no summed-deficit wording`, () => {
+      for (const key of [
+        "insights.sleep.debt.caption",
+        "insights.sleep.debt.clearCaption",
+      ]) {
+        const copy = resolve(msgs, key).toLowerCase();
+        for (const term of STALE_SUM_VOCABULARY[locale]) {
+          expect(
+            copy,
+            `${locale}/${key} still describes the pre-v1.19.0 summed shortfall ("${term}")`,
+          ).not.toContain(term);
+        }
+      }
+    });
+  }
+
+  it("the explainer states that catch-up sleep pays the balance down", () => {
+    const copy = resolve(bundle("en"), "insights.sleep.debt.computedInfo");
+    expect(copy.toLowerCase()).toContain("balance");
+    expect(copy.toLowerCase()).toContain("catch-up");
+  });
+});
+
+describe("the glucose reference band control is translated everywhere", () => {
+  const KEYS = [
+    "settings.glucoseReference.title",
+    "settings.glucoseReference.description",
+    "settings.glucoseReference.enable",
+    "settings.glucoseReference.explainer",
+    "settings.glucoseReference.disclaimer",
+    "settings.glucoseReference.error",
+  ] as const;
+
+  for (const locale of LOCALES) {
+    it(`${locale} carries every key`, () => {
+      const msgs = bundle(locale);
+      for (const key of KEYS) {
+        expect(resolve(msgs, key).length).toBeGreaterThan(0);
+      }
+    });
+  }
+
+  it("the disclaimer refuses the diagnosis reading (EN)", () => {
+    const copy = resolve(
+      bundle("en"),
+      "settings.glucoseReference.disclaimer",
+    ).toLowerCase();
+    expect(copy).toContain("not a diagnosis");
+    expect(copy).toContain("never inferred");
+  });
+});