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/components/shell/sidebar.tsx

@@ -55,7 +55,7 @@ export function Sidebar(): React.ReactElement {
             className="mt-0.5 h-[30px] w-[30px] shrink-0 rounded object-contain"
           />
         ) : (
-          <LogoMark size={30} title="Tactical Media Broadcast Hub" />
+          <LogoMark size={30} />
         )}
         <div className="min-w-0 flex-1">
           <div className="text-xs font-semibold leading-tight tracking-tight" title={workspaceName}>
@@ -67,7 +67,7 @@ export function Sidebar(): React.ReactElement {
             </div>
           ) : (
             <div className="truncate text-2xs text-text-faint" title={workspaceName}>
-              Tactical Media Broadcast Hub
+              T-HUB
             </div>
           )}
         </div>