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>

tailwind.config.js

@@ -4,12 +4,19 @@ export default {
   theme: {
     extend: {
       colors: {
+        // Waterschap Brabantse Delta brand palette (from WSBD-logo.svg)
+        wbd: {
+          deep: '#0a3d80',
+          blue: '#0d4f9e',
+          cyan: '#1fa0db',
+          lime: '#bed137'
+        },
         helix: {
-          area: '#0f52a5',
-          process: '#0c99d9',
-          unit: '#50a8d9',
-          equipment: '#86bbdd',
-          control: '#a9daee',
+          area: '#0a3d80',
+          process: '#0d4f9e',
+          unit: '#1fa0db',
+          equipment: '#6fc3ec',
+          control: '#b8dff5',
           bg: '#07111d',
           'bg-2': '#0c1c30',
           'bg-3': '#122842',
@@ -17,8 +24,8 @@ export default {
           ink: '#e6f1fb',
           'ink-dim': '#8fa6b8',
           'ink-faint': '#5b7388',
-          accent: '#4dd0c2',
-          'accent-2': '#c084fc'
+          accent: '#bed137',
+          'accent-2': '#d8e36a'
         }
       },
       fontFamily: {