feat: rebrand to R&D-lab + WBD palette + lab-slide cards

Identity refresh aligned to Waterschap Brabantse Delta.

Brand
- HELIX → R&D-lab everywhere user-facing (SITE.name; literal "HELIX"s
  swept across routes, app.html, login, error messages, seed).
- New tagline: "Projects, innovations, and every strand between."
- Site description updated.

Palette (sourced from the official WSBD-logo.svg)
- Primary #0d4f9e, secondary #1fa0db, accent #bed137 — added as
  --wbd-blue / --wbd-cyan / --wbd-lime CSS vars and as wbd.* in
  tailwind.config.js. helix.* aliases now point to the WBD palette.
- Strand A (Projects) → #1fa0db cyan. Strand B (Innovations) → #bed137 lime.
- Body vignette + scroll-bar + legend dots repainted accordingly.

Composite logo
- New 24px nav glyph + favicon.svg: WBD-style tilted-square mark in WBD
  blues at the centre, helix strands (lime + cyan) wrapping it, lime
  "active site" dot at the crossing. Says "R&D-lab × Brabantse Delta"
  in one mark.

Lab-slide cards (VerticalHelix)
- Frosted-glass surface (backdrop-filter blur+saturate).
- Thick 5px strand-coloured stripe on the helix-facing edge (gradient,
  glowing shadow). Slide rounds the stripe corners; the rest is square.
- Slide header has the strand badge and a monospace serial number
  (01/03 etc) — lab-specimen feel.
- Dashed footer rule + "Open detail →" CTA.
- Inline link chips (Gitea / Dashboard / Demo / Docs / Paper / Video)
  with inline SVG icons + short labels. Hover lights up in the strand
  colour. Capped at 5 visible, "+N" overflow indicator.
- Real <a> chips inside the card without nested <a>: overlay-link
  pattern (transparent slide-link absolute fills the card, chips sit on
  z-index: 2 above it).

Server load
- + Page now fetches each project's links in one Drizzle relational
  query (db.query.projects.findMany with: { links }), capped at 12.
- + Form: strand picker (Project / Innovation radios) reads + persists
  the new column.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

static/favicon.svg

@@ -1,8 +1,21 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+  <!-- Dark backplate -->
   <rect width="24" height="24" rx="5" fill="#07111d"/>
-  <path d="M5 4 C 5 10, 19 14, 19 20" fill="none" stroke="#4dd0c2" stroke-width="2.2" stroke-linecap="round"/>
-  <path d="M5 20 C 5 14, 19 10, 19 4" fill="none" stroke="#0c99d9" stroke-width="2.2" stroke-linecap="round"/>
-  <line x1="6" y1="6" x2="6" y2="6.5" stroke="#a9daee" stroke-width="1.2"/>
-  <line x1="12" y1="12" x2="12" y2="12.5" stroke="#a9daee" stroke-width="1.2"/>
-  <line x1="18" y1="18" x2="18" y2="18.5" stroke="#a9daee" stroke-width="1.2"/>
+
+  <!-- WBD-style tilted square mark (echo of the Waterschap diamond) -->
+  <g transform="rotate(45 12 12)">
+    <rect x="5.5" y="5.5" width="13" height="13" rx="0.5" fill="#0d4f9e" fill-opacity="0.9"/>
+    <rect x="8.2" y="8.2" width="7.6" height="7.6" rx="0.4" fill="#1fa0db"/>
+  </g>
+
+  <!-- Helix strand A (front) — WBD lime, wraps around -->
+  <path d="M4 4 C 4 10, 20 14, 20 20"
+        fill="none" stroke="#bed137" stroke-width="2.1" stroke-linecap="round"/>
+  <!-- Helix strand B (back) — softer cyan -->
+  <path d="M4 20 C 4 14, 20 10, 20 4"
+        fill="none" stroke="#1fa0db" stroke-width="2.1" stroke-linecap="round" stroke-opacity="0.9"/>
+
+  <!-- Center "active site" lime dot -->
+  <circle cx="12" cy="12" r="1.9" fill="#bed137"/>
+  <circle cx="12" cy="12" r="0.9" fill="#07111d"/>
 </svg>