complete i18n migration to /[locale]/ with EN+ES content

Full rewrite of the docs site under app/[locale]/ with next-intl
in localePrefix:"always" mode. Every page now exists at both
/en/<path> and /es/<path>; the root / shows a meta-refresh + JS
redirect to /<defaultLocale>/ so GitHub Pages serves something
on the apex URL.

Highlights:
- 107 doc pages migrated to file-per-page JSON namespaces under
  messages/en/ and messages/es/. Spanish content is fully
  translated (no copy-of-English placeholders).
- New documentation for the Active Suppressions section in the
  Settings tab and the per-event Dismiss dropdown in the Health
  Monitor modal.
- New screenshots: dismiss-duration-dropdown.png and an updated
  health-suppression-settings.png.
- Pagefind integrated for client-side search; index is built on
  every CI deploy (not committed).
- RSS feeds: per-locale at /<locale>/rss.xml plus root /rss.xml
  for backward compat.
- Removed the dead app/[locale]/guides/[slug]/ route — every
  guide now has its own static page and no markdown source
  remains.
- Fixed orphan link /guides/nvidia -> /guides/nvidia-manual in
  docs/hardware/nvidia-host.
- Removed obsolete components (footer2, calendar, drawer).

Verified locally with `npm ci && npm run build`: 2804 files in
out/, 231 pages indexed by pagefind, root redirect intact, both
locale roots and the new Active Suppressions docs render OK.

web/components/DocBreadcrumb.tsx

@@ -0,0 +1,62 @@
+"use client"
+
+import { usePathname } from "@/i18n/navigation"
+import { Link } from "@/i18n/navigation"
+import { Home, ChevronRight } from "lucide-react"
+
+/**
+ * Breadcrumb shown above the docs content.
+ *
+ * Reads the current pathname (after the locale prefix has been
+ * stripped by next-intl) and turns each segment into a clickable
+ * crumb. Segments are humanized — `access-auth` → "Access Auth".
+ * Intermediate links go to their parent docs section; the last
+ * segment is the current page and renders as plain text.
+ *
+ * Skips itself entirely on the docs root (`/docs`) where the
+ * breadcrumb would just be "Docs" with nothing meaningful before it.
+ */
+export function DocBreadcrumb() {
+  const pathname = usePathname()
+  const segments = pathname.split("/").filter(Boolean)
+
+  // Need at least `docs/<section>` to show something useful.
+  if (segments.length < 2 || segments[0] !== "docs") return null
+
+  const crumbs = segments.map((seg, i) => {
+    const href = "/" + segments.slice(0, i + 1).join("/")
+    const label = humanize(seg)
+    const isLast = i === segments.length - 1
+    return { href, label, isLast }
+  })
+
+  return (
+    <nav aria-label="Breadcrumb" className="mb-6 text-sm">
+      <ol className="flex items-center flex-wrap gap-1 text-gray-500">
+        <li className="flex items-center">
+          <Link href="/" className="flex items-center hover:text-gray-900 transition-colors" aria-label="Home">
+            <Home className="h-4 w-4" />
+          </Link>
+        </li>
+        {crumbs.map((c) => (
+          <li key={c.href} className="flex items-center gap-1">
+            <ChevronRight className="h-3.5 w-3.5 text-gray-400" />
+            {c.isLast ? (
+              <span className="text-gray-900 font-medium">{c.label}</span>
+            ) : (
+              <Link href={c.href} className="hover:text-gray-900 transition-colors">
+                {c.label}
+              </Link>
+            )}
+          </li>
+        ))}
+      </ol>
+    </nav>
+  )
+}
+
+function humanize(slug: string): string {
+  return slug
+    .replace(/-/g, " ")
+    .replace(/\b\w/g, (c) => c.toUpperCase())
+}