Fleet calculator: machine park schematic with the stamper line feeding it

User, October 2026: add a visualization of the machine park and the
connected stamper production to the tool.

- New card "Machine park and stamper production": one live SVG that
  follows every input. Top: the stamper line, lathe, Pheenix PASU, PPPU,
  PDPU (2 cells), PMPB, Sibert VSF, VSP, VSC, each with its count, flow a
  day and how busy it is. Middle: the press hall, each Duplex cell drawn as
  in the cell sketch (presses either side of the operator, EX 50 and EX 35
  behind, trimmer in front) and each Classic with its built-in extruder,
  wrapping into rows and scaling down for big fleets; compound in on the
  left, stamper rack in and finishing out on the right. Bottom: central
  hydraulics, boiler, cooling, air and electrical piped up into the hall,
  amber where they exceed the plant as planned today.
- Stamper production is now counted per station from the cycle times in
  galvanics.md (silvering, pre-plate four at a time, father, mother,
  stamper plus handling per PDPU cell, PMPB, Sibert steps; usable share of
  the hours 80 %, estimate) instead of a flat 20 to 32 parts per PDPU.
  At the defaults: 1 PDPU at ~43 % busy, as galvanics.md concludes.
  New assumptions with sources; the lathe rate (8 sides a day) is an
  estimate.
- Requirements table: per-station counts and load; the URL hash now also
  reloads in an open tab (hashchange).

Checked headless in Edge, both themes: no JS errors, no text overlap or
overflow in the schematic at the default, 8 M and 30 M records, no
horizontal overflow at 390 px.

README.md

@@ -179,8 +179,11 @@ The detail lives in dedicated documents:
   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,
   power, central hydraulics, steam, cooling, air, floor, compound and
-  stampers that fleet needs; every assumption is editable, with its
-  source, and a scenario can be shared by link
+  stampers that fleet needs, drawn as a live schematic of the machine
+  park with the stamper line (lathe, Pheenix galvanics, Sibert prep)
+  feeding it, each station counted from the galvanics cycle times;
+  every assumption is editable, with its source, and a scenario can be
+  shared by link
 - [Test site](site/README.md): `site/` builds https://cnxvinyl.lol/, the
   internal test site with demo pages from `docs/` (the plant operation
   page first) and any static site we want to share by link; Gitea Actions