Plant and business plan calculator: configuration, investment, budget, ten-year cash

User request (October 2026): an interactive business plan calculator
where the plant configuration is chosen and everything follows. Built
into the fleet calculator (same page and URL, one model):

- Plant configuration card: galvanics in-house or bought stampers (and
  Pheenix estimate vs OMS reference), mastering and cutting in-house or
  outsourced, metrology full or launch tier, cassette and CD-R, solar
  buy / PPA / none, electric or biomass steam, Thai or Chinese utilities,
  crane buy or rent, visitor corridor now or later, ramp-up reserve;
  stamper supply to other plants; disabled-not-hidden controls.
- Investment built from the total-investment blocks (low / mid / high,
  sources and kind badges); boiler and chiller modules sized from the
  fleet and flagged past the four positions; phase 2 building past the
  870 m2 press hall. Default reproduces 160.9 / 226.7 / 292.5M THB.
- Budget card against 180M and 216M THB; "Investor levers" preset gives
  193.6M mid, 203.6 to 213.6M with the reserve.
- Money follows the configuration: outsourced title steps passed through
  at cost (fee split 51.1 / 37.0 / 11.9 %), electric steam energy and
  demand charge, PPA power price, optional cassette/CD-R revenue.
- Ten-year cash view: editable ramp and discount rate, payback, NPV, IRR,
  chart and table; pre-tax, pre-financing sketch.
- Presets: launch plant, investor levers, lean, five-press, full hall.
- Verified headless on Edge: 62 checks, 390 / 1024 / 1440 px, dark and
  light, no overflow, no page errors.

Business plan 9.4 cross-check updated to the calculator's figures
(EBITDA 1.68M, payback 4.1 yr; cash payback year ~5.7, IRR ~13 %);
docx and pdf rebuilt. README and landing entry renamed.

README.md

@@ -225,11 +225,19 @@ The detail lives in dedicated documents:
   1× is real time, up to 3600× (a day in 24 s); every station is
   clickable and names the source of its figures; on phones and tablets
   held sideways it pinch-zooms and opens station details in a side sheet
-- [Press fleet calculator](docs/fleet-calculator.html): a single static
-  page for the business plan: set the records a year and the share of
-  splatter and specials, and it sizes the mix of Duplex systems (3
-  records a minute each) and Classics (2 a minute) from the start fleet
-  of two Duplex and one Classic up to a full press hall, with the people,
+- [Plant and business plan calculator](docs/fleet-calculator.html): a
+  single static page for the business plan: choose the plant
+  configuration (presses, galvanics in-house or bought stampers, cutting
+  in-house or outsourced, metrology tier, cassette and CD-R, solar bought,
+  PPA or none, steam fuel, Thai or Chinese utilities, crane, visitor
+  corridor) and it builds the investment from the cost blocks of the
+  total investment, checks it against the investor's 180M and 216M THB,
+  and runs the money a year and a ten-year cash view (payback, NPV, IRR,
+  pre-tax sketch), with presets from the launch plant to a full hall. Set
+  the records a year and the share of splatter and specials, and it sizes
+  the mix of Duplex systems (3 records a minute each) and Classics (2 a
+  minute) from the launch plant of one Duplex and one Classic up to a
+  full press hall, with the people,
   power, central hydraulics, steam, cooling, air, floor, compound and
   stampers that fleet needs, drawn as a live schematic of the machine
   park with the stamper line (lathe, Pheenix galvanics, Sibert prep)