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-chat.svg

@@ -1,7 +1,7 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 1200 1200">
   <title>Nav Chat</title>
-  <path d="M 220 300 A 80 80 0 0 1 300 220 L 900 220 A 80 80 0 0 1 980 300 L 980 660 A 80 80 0 0 1 900 740 L 520 740 L 340 920 L 340 740 L 300 740 A 80 80 0 0 1 220 660 Z" fill="none" stroke="#FF1610" stroke-width="55" stroke-linejoin="round"/>
-  <circle cx="450" cy="480" r="45" fill="#FF1610"/>
-  <circle cx="600" cy="480" r="45" fill="#FF1610"/>
-  <circle cx="750" cy="480" r="45" fill="#FF1610"/>
+  <path d="M 220 300 A 80 80 0 0 1 300 220 L 900 220 A 80 80 0 0 1 980 300 L 980 660 A 80 80 0 0 1 900 740 L 520 740 L 340 920 L 340 740 L 300 740 A 80 80 0 0 1 220 660 Z" fill="none" stroke="#000000" stroke-width="55" stroke-linejoin="round"/>
+  <circle cx="450" cy="480" r="45" fill="#000000"/>
+  <circle cx="600" cy="480" r="45" fill="#000000"/>
+  <circle cx="750" cy="480" r="45" fill="#000000"/>
 </svg>