ux(nav): SiteHeader on every sub-page; BureauNav back to pure breadcrumb

Two related navbar issues from the audit:
- Sub-pages on desktop only had the breadcrumb pills — readers on a case
  file couldn't get to /sightings or /witnesses without going home first.
- Entity-list pages (/sightings, /witnesses, …) stacked SiteHeader AND
  BureauNav and BOTH carried a locale toggle + auth pill, surfacing every
  control twice.

This pass unifies the chrome:

- BureauNav slimmed: only the ← home pill, the section pill, and the
  breadcrumb trail. Locale toggle, auth pill and mobile hamburger removed
  — SiteHeader owns those.
- SiteHeader added above BureauNav on /bureau, /c/[slug], /h/[id], and
  /jobs/[id]. The four pages that previously skipped it now have the full
  global nav on desktop and a single hamburger on mobile.
- Entity-list pages (which already stacked the two) lose their duplicate
  controls; verified live: 1 toggle + 1 sign-in on /sightings, /bureau,
  /c/d44; 1 hamburger on mobile case files.

No regressions on /documents or the home (both already followed the
SiteHeader-only or stacked-correctly pattern).

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

web/app/bureau/page.tsx

@@ -7,6 +7,7 @@
  */
 import { BureauNav } from "@/components/bureau-nav";
 import { CaseLibraryBrowser } from "@/components/case-library-browser";
+import { SiteHeader } from "@/components/site-header";
 import { getLocale } from "@/components/locale-toggle";
 import { loadCases } from "@/lib/cases";
 
@@ -19,6 +20,7 @@ export default async function BureauPage() {
 
   return (
     <div className="min-h-screen bg-[#0a0e1a] text-[#e7ecf3]">
+      <SiteHeader locale={locale} />
       <BureauNav locale={locale} crumbs={[{ label: locale === "en" ? "case files" : "casos" }]} />
       <main id="main" className="mx-auto max-w-5xl px-4 md:px-8 py-10 md:py-14">
         <header className="mb-8 md:mb-10">

web/app/c/[slug]/page.tsx

@@ -11,6 +11,7 @@ import path from "node:path";
 import type { Metadata } from "next";
 import { MarkdownBody } from "@/components/markdown-body";
 import { BureauNav } from "@/components/bureau-nav";
+import { SiteHeader } from "@/components/site-header";
 import { getLocale } from "@/components/locale-toggle";
 import { pickLocaleBody } from "@/lib/bilingual";
 
@@ -151,6 +152,7 @@ export default async function CaseReportPage({
 
   return (
     <div className="min-h-screen bg-[#0a0e1a] text-[#e7ecf3]">
+      <SiteHeader locale={locale} />
       <BureauNav locale={locale} crumbs={[
         { label: locale === "en" ? "case files" : "casos", href: "/bureau" },
         { label: title.length > 32 ? title.slice(0, 32) + "…" : title },

web/app/h/[hypothesisId]/page.tsx

@@ -17,6 +17,7 @@ import { readFile } from "node:fs/promises";
 import path from "node:path";
 import { pgQuery } from "@/lib/retrieval/db";
 import { BureauNav } from "@/components/bureau-nav";
+import { SiteHeader } from "@/components/site-header";
 import { getLocale } from "@/components/locale-toggle";
 import { RedTeamRequestButton } from "@/components/red-team-request-button";
 
@@ -198,6 +199,7 @@ export default async function HypothesisPage({
 
   return (
     <div className="min-h-screen bg-[#0a0e1a] text-[#e7ecf3]">
+      <SiteHeader locale={navLocale} />
       <BureauNav locale={navLocale} crumbs={[
         { label: "bureau", href: "/bureau" },
         { label: "hypotheses", href: "/bureau#hypotheses" },

web/app/jobs/[id]/page.tsx

@@ -18,6 +18,7 @@ import { notFound } from "next/navigation";
 import Link from "next/link";
 import { pgQuery } from "@/lib/retrieval/db";
 import { BureauNav } from "@/components/bureau-nav";
+import { SiteHeader } from "@/components/site-header";
 import { getLocale } from "@/components/locale-toggle";
 import { JobStatusPoller } from "@/components/job-status-poller";
 
@@ -77,6 +78,7 @@ export default async function JobPage({
 
   return (
     <div className="min-h-screen bg-[#0a0e1a] text-[#e7ecf3]">
+      <SiteHeader locale={navLocale} />
       <BureauNav locale={navLocale} crumbs={[
         { label: "bureau", href: "/bureau" },
         { label: "jobs", href: "/bureau#jobs" },

web/components/bureau-nav.tsx

@@ -1,20 +1,16 @@
 /**
- * BureauNav — top navigation bar present on every bureau sub-page.
+ * BureauNav — slim breadcrumb bar present on every bureau sub-page.
  *
- * Solves "I'm stuck on this page, there's no way back" UX. Shows:
- *   - "← Home" (always → /)
- *   - "Bureau" (always → /bureau)
- *   - Breadcrumb trail of current page (passed via props)
- *   - Locale toggle + auth pill on the right
- *
- * Visually harmonised with SiteHeader (single gold palette, no cyan); labels
- * localised.
+ * Pure breadcrumb now: ← home, the section pill, and the trail of crumbs.
+ * The global primary nav, locale toggle and auth pill all live in
+ * SiteHeader, which is rendered above BureauNav on every sub-page; that
+ * stack is what gives the reader desktop access to /sightings, /witnesses,
+ * etc. from anywhere, and what gives mobile users a single hamburger
+ * instead of two stacked ones.
  */
 import Link from "next/link";
 import { ArrowLeft } from "lucide-react";
-import { AuthBar } from "./auth-bar";
-import { LocaleToggle, type Locale } from "./locale-toggle";
-import { MobileNav } from "./mobile-nav";
+import { type Locale } from "./locale-toggle";
 
 export interface Crumb {
   /** Display label. */
@@ -30,18 +26,6 @@ const COPY = {
 
 export function BureauNav({ crumbs, locale = "pt-br" }: { crumbs: Crumb[]; locale?: Locale }) {
   const t = COPY[locale];
-  // Same item list as the SiteHeader on the home — the mobile drawer carries
-  // it so a reader on a case file can still jump to /sightings or /witnesses.
-  const navItems = [
-    { href: "/sightings",  label: locale === "en" ? "Sightings"  : "Avistamentos" },
-    { href: "/witnesses",  label: locale === "en" ? "Witnesses"  : "Testemunhas" },
-    { href: "/objects",    label: locale === "en" ? "Craft"      : "Objetos" },
-    { href: "/locations",  label: locale === "en" ? "Locations"  : "Locais" },
-    { href: "/operations", label: locale === "en" ? "Programs"   : "Programas" },
-    { href: "/bureau",     label: locale === "en" ? "Case files" : "Casos" },
-    { href: "/search",     label: locale === "en" ? "Search"     : "Busca" },
-  ];
-
   return (
     <nav
       aria-label={locale === "en" ? "Breadcrumb" : "Trilha"}
@@ -80,17 +64,6 @@ export function BureauNav({ crumbs, locale = "pt-br" }: { crumbs: Crumb[]; local
             ))}
           </div>
         )}
-
-        {/* Desktop right cluster — toggle + auth. Hidden on mobile; the
-            hamburger drawer carries the same controls there. */}
-        <span className="ml-auto hidden md:inline-flex items-center gap-2">
-          <LocaleToggle current={locale} variant="navbar" />
-          <AuthBar locale={locale} />
-        </span>
-        {/* Mobile menu — hamburger that opens the full primary nav drawer. */}
-        <span className="ml-auto md:hidden">
-          <MobileNav locale={locale} items={navItems} />
-        </span>
       </div>
     </nav>
   );