Order tool: fan funding; deck: light and dark, 60/40 shareholding

User, 20 Oct 2026: can the deck also be made in a light and dark mode;
the new order tool should also offer fan funding, so the platform
screenshots match and use the same calculator; the main investor holds
at least 60 %, so 40 % is for sale.

Order tool (docs/order.html, /demos/order/):
- New step 15 "How to pay": pay the plant directly (deposit) or let
  fans fund it; step 16 becomes "Review & launch" with the campaign
  simulation and its three outcomes.
- Campaign maths ported from make-a-record (fan price, length, cap, own
  copies, VAT; fans needed = max(100, break-even); keep at the goal and
  with more fans; price hint); R gains fee (3.5 %), VAT and campaign
  length with sources; no price changed.
- Quote card shows fan price, fans needed and the artist's keep on the
  fan route; route and campaign in the #q= hash; deep links
  #s=<step>&p=<preset>&route=fans.
- Parity with make-a-record: 206/206 checks over 40 configurations;
  default quotes unchanged (37,836 / 217 / 102,936 THB; partner
  mastering 43,676).

Investor deck (docs/pitch/):
- Light and dark theme like the other site pages (cnx-theme, T key and
  button), presenter and overview follow; charts from CSS variables;
  text pairs at WCAG AA in both themes; tool screenshots in both themes.
- Two PDFs: dark and light (print-friendly), each ~1.5 MB.
- Platform slide: both pictures from the order tool (Splatter 12" order
  step and its fan-funding view: 100 fans at 1,200 THB, break-even 46,
  ~480 THB a copy kept).
- BOI and financing slide: shareholding bar, lead investor at least 60 %,
  at most 40 % for co-investors (~32M / ~22M THB at the ~54M equity
  floor, arithmetic only); the ask offers up to 40 %.

Docs: artist-platform.md (fan funding in the order tool), README and
landing page entries.

site/public/index.html

@@ -78,8 +78,9 @@ document.documentElement.setAttribute("data-theme",t);})();
         chain under one roof, the platform, site and utilities, Plan B by
         block and why Plan B, the operating picture with its adverse case,
         cash and returns, BOI promotion and its conditions, schedule,
-        risks, team and the ask. Press P for the presenter view; a PDF is
-        linked in the control bar.</span>
+        risks, team and the ask. Light and dark (press T), P for the
+        presenter view; a PDF of each theme is linked in the control
+        bar.</span>
       </a>
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   </ul>
@@ -155,9 +156,10 @@ document.documentElement.setAttribute("data-theme",t);})();
         extras, mastering and cutting, test pressings, shipping, track list
         and artwork, each step with its choices, beside a large live picture
         of the record that changes with every choice and a running price and
-        ship date. Ends in a review that lists what is still missing and the
-        itemised quote. Indicative demo prices; nothing is uploaded or
-        sent.</span>
+        ship date. Then how to pay: directly, or a fan-funded campaign with
+        the fans needed and what the artist keeps. Ends in a review that
+        lists what is still missing and the itemised quote. Indicative demo
+        prices; nothing is uploaded or sent.</span>
       </a>
     </li>
     <li>