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/public/brand/nav-settings.svg

@@ -1,4 +1,4 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 1200 1200">
   <title>Nav Settings</title>
-  <circle cx="600" cy="600" r="150" fill="none" stroke="#FF1610" stroke-width="40"/><g stroke="#FF1610" stroke-width="35" stroke-linecap="round"><line x1="600" y1="350" x2="600" y2="420"/><line x1="600" y1="780" x2="600" y2="850"/><line x1="350" y1="600" x2="420" y2="600"/><line x1="780" y1="600" x2="850" y2="600"/><line x1="420" y1="420" x2="470" y2="470"/><line x1="730" y1="730" x2="780" y2="780"/><line x1="420" y1="780" x2="470" y2="730"/><line x1="730" y1="470" x2="780" y2="420"/></g>
+  <circle cx="600" cy="600" r="150" fill="none" stroke="#000000" stroke-width="40"/><g stroke="#000000" stroke-width="35" stroke-linecap="round"><line x1="600" y1="350" x2="600" y2="420"/><line x1="600" y1="780" x2="600" y2="850"/><line x1="350" y1="600" x2="420" y2="600"/><line x1="780" y1="600" x2="850" y2="600"/><line x1="420" y1="420" x2="470" y2="470"/><line x1="730" y1="730" x2="780" y2="780"/><line x1="420" y1="780" x2="470" y2="730"/><line x1="730" y1="470" x2="780" y2="420"/></g>
 </svg>