feat(documents): add the AI-settings toggle to read documents automatically

Add a single switch in AI settings — off by default — that turns on ambient AI
reading of uploaded vault documents. Turning it on reveals a once-shown,
vendor-blind honesty confirm (subscription providers may use the content to
improve their models; a self-hosted local model never egresses) that must be
acknowledged before the setting is written. Copy is translated across all six
locales.

src/components/settings/ai/ai-insights-card.tsx

@@ -31,6 +31,7 @@ import { queryKeys } from "@/lib/query-keys";
 
 import { AdminOpenAIProviderForm } from "./admin-openai-provider-form";
 import { AnthropicProviderForm } from "./anthropic-provider-form";
+import { AutoReadCard } from "./auto-read-card";
 import { CodexProviderForm } from "./codex-provider-form";
 import { DocumentScanCard } from "./document-scan-card";
 import { FallbackChainCard } from "./fallback-chain-card";
@@ -181,6 +182,9 @@ export function AiInsightsCard({
         {/* v1.22 (#90) — dedicated document-scan (Lab-OCR) provider. */}
         <DocumentScanCard userProvider={userProvider} />
 
+        {/* Read uploaded vault documents automatically with AI (opt-in). */}
+        <AutoReadCard />
+
         <RuntimeActionsRow
           provider={selectedProvider}
           userProvider={userProvider}

src/components/settings/ai/auto-read-card.tsx

@@ -0,0 +1,144 @@
+"use client";
+
+/* ────────────────────────────────────────────────────────────────
+ * Read documents automatically with AI (per-user opt-in).
+ *
+ * One switch. OFF by default: the vault stays local-first and every external AI
+ * read of an uploaded document needs an explicit per-document action. When ON,
+ * each newly uploaded document is read and indexed by the configured AI provider
+ * with no per-document tap — the "upload and the AI just reads it" flow.
+ *
+ * Turning it ON reveals a once-shown honesty confirm (vendor-blind) before the
+ * setting is written, because the trade — a subscription provider may use the
+ * content to improve its models, with no data-processing agreement — must be
+ * acknowledged, not buried. Turning it OFF is immediate.
+ * ──────────────────────────────────────────────────────────────── */
+
+import { useState } from "react";
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { ShieldAlert } from "lucide-react";
+
+import { Button } from "@/components/ui/button";
+import { Switch } from "@/components/ui/switch";
+import { apiGet, apiPatch } from "@/lib/api/api-fetch";
+import { useTranslations } from "@/lib/i18n/context";
+import { queryKeys } from "@/lib/query-keys";
+
+interface AutoReadPref {
+  documentsAutoAiRead: boolean;
+}
+
+export function AutoReadCard() {
+  const { t } = useTranslations();
+  const queryClient = useQueryClient();
+
+  // Whether the honesty confirm is currently shown (user flipped the switch ON
+  // but has not yet acknowledged the trade). Off→on reveals it; the write only
+  // happens on confirm.
+  const [pendingEnable, setPendingEnable] = useState(false);
+
+  const { data, isLoading } = useQuery<AutoReadPref>({
+    queryKey: queryKeys.documentsAutoAiRead(),
+    queryFn: () => apiGet<AutoReadPref>("/api/auth/me/documents-auto-ai-read"),
+    staleTime: 60_000,
+  });
+
+  const enabled = data?.documentsAutoAiRead ?? false;
+
+  const save = useMutation<AutoReadPref, Error, boolean>({
+    mutationFn: (next: boolean) =>
+      apiPatch<AutoReadPref>("/api/auth/me/documents-auto-ai-read", {
+        documentsAutoAiRead: next,
+      }),
+    onSuccess: (result) => {
+      queryClient.setQueryData(queryKeys.documentsAutoAiRead(), result);
+      // Flipping the toggle changes whether an ambient/per-document read
+      // egresses without a per-document consent step — refresh the capability
+      // probe the vault UI reads.
+      queryClient.invalidateQueries({
+        queryKey: queryKeys.inboundDocumentAiCapability(),
+      });
+      setPendingEnable(false);
+    },
+  });
+
+  function onSwitch(next: boolean) {
+    if (next) {
+      // Off → on: reveal the honesty confirm; do NOT write yet.
+      if (!enabled) setPendingEnable(true);
+      return;
+    }
+    // On → off (or cancel a pending enable): write immediately, hide confirm.
+    setPendingEnable(false);
+    if (enabled) save.mutate(false);
+  }
+
+  const busy = isLoading || save.isPending;
+  const checked = enabled || pendingEnable;
+
+  return (
+    <div
+      data-slot="documents-auto-read-card"
+      className="bg-muted/50 space-y-4 rounded-lg p-4"
+    >
+      <div className="flex items-start justify-between gap-3">
+        <div>
+          <p className="text-sm font-medium">
+            {t("settings.ai.autoRead.title")}
+          </p>
+          <p className="text-muted-foreground text-xs">
+            {t("settings.ai.autoRead.subLabel")}
+          </p>
+        </div>
+        <Switch
+          checked={checked}
+          disabled={busy}
+          onCheckedChange={onSwitch}
+          aria-label={t("settings.ai.autoRead.title")}
+          data-testid="documents-auto-read-enable"
+        />
+      </div>
+
+      {pendingEnable ? (
+        <div
+          data-slot="documents-auto-read-confirm"
+          role="note"
+          className="border-border space-y-3 rounded-lg border border-dashed px-3 py-2.5"
+        >
+          <div className="text-muted-foreground flex items-start gap-2 text-xs">
+            <ShieldAlert className="mt-0.5 size-3.5 shrink-0" aria-hidden />
+            <p className="min-w-0">{t("settings.ai.autoRead.honesty")}</p>
+          </div>
+          <div className="flex flex-wrap gap-2">
+            <Button
+              type="button"
+              size="sm"
+              className="min-h-11 sm:min-h-9"
+              disabled={save.isPending}
+              onClick={() => save.mutate(true)}
+              data-slot="documents-auto-read-confirm-cta"
+            >
+              {t("settings.ai.autoRead.confirm")}
+            </Button>
+            <Button
+              type="button"
+              size="sm"
+              variant="ghost"
+              className="min-h-11 sm:min-h-9"
+              disabled={save.isPending}
+              onClick={() => setPendingEnable(false)}
+            >
+              {t("settings.ai.autoRead.cancel")}
+            </Button>
+          </div>
+        </div>
+      ) : null}
+
+      {save.isError ? (
+        <p className="text-destructive text-xs">
+          {t("settings.ai.errorGeneric")}
+        </p>
+      ) : null}
+    </div>
+  );
+}