style: light theme and hand-inked logo matching acampada26s.net

The previous pass kept the dark base and the red icons, which did not
read as the acampada. Now:

- Light theme: white page, black ink and borders, black buttons with a
  hard neon offset shadow, neon for focus and the active nav item;
  h1/h2 in Anton with the stepped neon shadow of the site headings.
- Nav, empty-state, spinner and pattern assets in black; platform icons
  keep their dark disc with a neon stroke.
- New mark: three dome tents wired from their doors into a switch with
  an antenna, drawn in the inked style of the acampada logo (curved
  poles, ball ends, hatching) over a neon offset copy. LogoMark renders
  it inline; visible product name is T-HUB.
- docs/brand: t-hub.svg and a lockup with the Anton wordmark converted
  to outlines so it renders without the font.
- Public submission page moved to the light palette.

Checked with headless Chromium screenshots (offline sample data) on
desktop and mobile.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/app/(main)/onboarding/page.tsx

@@ -221,15 +221,15 @@ export default function OnboardingPage(): React.ReactElement {
                 <div className="mb-5">
                   <div className="-m-6 mb-5 overflow-hidden bg-black">
                     <div className="flex items-center gap-5 px-8 py-8">
-                      <LogoMark size={96} className="shrink-0 text-accent" />
+                      <LogoMark size={96} className="shrink-0 text-white" />
                       <div className="min-w-0">
                         <div className="text-xl font-semibold leading-tight text-white">Horizontal Collaborative Broadcast System</div>
-                        <div className="mt-1 text-xs uppercase tracking-wider text-text-faint">Tactical Media Broadcast Hub</div>
+                        <div className="mt-1 text-xs uppercase tracking-wider text-[#00e5ff]">T-HUB</div>
                       </div>
                     </div>
                   </div>
                   <div className="text-center">
-                    <h1 className="text-2xl font-semibold tracking-tight">Tactical Media Broadcast Hub</h1>
+                    <h1 className="text-2xl font-semibold tracking-tight">T-HUB</h1>
                     <p className="mt-1 text-2xs text-text-faint">Your platform. Their feeds. No algorithm in between.</p>
                   </div>
                 </div>