ux(user): drop tombstone + Certificate of Death heading on profile pages

Use SubpageShell (same as About/Legal) so /user/<name> shows just the
username as the title, with the back arrow in the identical position
to all other subpages.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: dotsystemsdevs

src/app/user/[username]/page.tsx

@@ -2,12 +2,10 @@
 
 import { useEffect, useState } from 'react'
 import { useParams, useRouter } from 'next/navigation'
-import Link from 'next/link'
 import type { UserRepoSummary } from '@/lib/types'
 import UserDashboard from '@/components/UserDashboard'
 import LoadingState from '@/components/LoadingState'
-import SiteFooter from '@/components/SiteFooter'
-import PageHero from '@/components/PageHero'
+import SubpageShell from '@/components/SubpageShell'
 
 const MONO = `var(--font-courier), system-ui, sans-serif`
 
@@ -35,62 +33,30 @@ export default function UserPage() {
   }, [username])
 
   return (
-    <main className="page-shell-main">
-      <div className="page-shell-inner">
-
-        <div style={{ paddingBottom: '4px', marginBottom: '2px' }}>
-          <Link
-            href="/"
-            aria-label="Back to home"
-            className="subpage-back-link alive-interactive"
-            style={{
-              fontFamily: MONO, display: 'inline-flex', alignItems: 'center', gap: '5px',
-              color: '#9a9288', textDecoration: 'none', fontSize: '11px', fontWeight: 400,
-              letterSpacing: '0.06em', WebkitTapHighlightColor: 'transparent', transition: 'color 0.15s',
-            }}
-            onMouseEnter={e => { (e.currentTarget as HTMLAnchorElement).style.color = '#1a1a1a' }}
-            onMouseLeave={e => { (e.currentTarget as HTMLAnchorElement).style.color = '#9a9288' }}
+    <SubpageShell
+      title={`@${username}`}
+      subtitle={
+        <span style={{ fontFamily: MONO, fontSize: '12px', color: 'var(--c-muted)', letterSpacing: '0.04em' }}>
+          dev graveyard
+        </span>
+      }
+      microcopy={null}
+    >
+      {loading && <LoadingState />}
+
+      {error && (
+        <div style={{ textAlign: 'center', padding: '40px 0' }}>
+          <p style={{ fontFamily: MONO, fontSize: '13px', color: '#8B0000', marginBottom: '20px' }}>{error}</p>
+          <button
+            onClick={() => router.push('/')}
+            style={{ fontFamily: MONO, fontSize: '13px', fontWeight: 700, background: 'none', border: 'none', textDecoration: 'underline', textUnderlineOffset: '3px', color: '#160A06', cursor: 'pointer', minHeight: '44px', padding: '10px 0' }}
           >
-            ← home
-          </Link>
+            ← examine another subject
+          </button>
         </div>
+      )}
 
-        <PageHero
-          title="Certificate of Death"
-          subtitle={
-            <span style={{
-              display: 'block',
-              fontFamily: MONO,
-              fontSize: 'clamp(15px, 4vw, 19px)',
-              fontWeight: 700,
-              color: '#2a2218',
-              letterSpacing: '0.02em',
-              marginTop: '2px',
-            }}>
-              @{username}
-            </span>
-          }
-          brandHref="/"
-        />
-
-        {loading && <LoadingState />}
-
-        {error && (
-          <div style={{ textAlign: 'center', padding: '40px 0' }}>
-            <p style={{ fontFamily: MONO, fontSize: '13px', color: '#8B0000', marginBottom: '20px' }}>{error}</p>
-            <button
-              onClick={() => router.push('/')}
-              style={{ fontFamily: MONO, fontSize: '13px', fontWeight: 700, background: 'none', border: 'none', textDecoration: 'underline', textUnderlineOffset: '3px', color: '#160A06', cursor: 'pointer', minHeight: '44px', padding: '10px 0' }}
-            >
-              ← examine another subject
-            </button>
-          </div>
-        )}
-
-        {repos && !loading && <UserDashboard repos={repos} username={username} />}
-
-        <SiteFooter />
-      </div>
-    </main>
+      {repos && !loading && <UserDashboard repos={repos} username={username} />}
+    </SubpageShell>
   )
 }