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/icon-bluesky.svg

@@ -1,6 +1,6 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 1700 1700">
   <title>Bluesky</title>
-  <circle cx="850" cy="850" r="560" fill="#0a0a0b" stroke="#FF1610" stroke-width="38"
+  <circle cx="850" cy="850" r="560" fill="#0a0a0b" stroke="#00E5FF" stroke-width="38"
           transform="rotate(-17.5 850 850)"/>
-  <path d="M 350 450 Q 400 350 500 400 L 600 480 L 700 400 Q 800 350 850 450 Q 850 550 750 650 L 600 780 L 450 650 Q 350 550 350 450 Z" fill="none" stroke="#FF1610" stroke-width="35" stroke-linecap="round" stroke-linejoin="round"/>
+  <path d="M 350 450 Q 400 350 500 400 L 600 480 L 700 400 Q 800 350 850 450 Q 850 550 750 650 L 600 780 L 450 650 Q 350 550 350 450 Z" fill="none" stroke="#00E5FF" stroke-width="35" stroke-linecap="round" stroke-linejoin="round"/>
 </svg>