Plant operation page: work on phones and tablets held sideways

The header no longer forces a 1,600 px layout: it wraps on tablets and
narrow desktops (all nine KPIs now fit at 1,600 px, one was clipped
before), and on short screens (max-height 560 px, i.e. phones in
landscape) it collapses to one row with a scrolling KPI strip. There the
detail, event log and legend move into a side sheet (Info button, opens
by itself when a station is tapped), so the drawing gets the full height.

The drawing pans and zooms by viewBox, so the sim coordinates are
untouched: pinch and drag on touch, wheel and drag with a mouse, plus
zoom buttons and +/-/0 keys. A drag or pinch never selects the station
under the finger. Uses 100dvh and disables iOS landscape text inflation.
Upright phones get a hint to turn sideways.

Checked in Chrome device emulation at 667x375, 740x360, 844x390,
932x430, 1024x768, 1180x820, 1366x1024, 1258x800, 1600x900, 1920x1080
(no horizontal overflow, zoom controls clear of every station) with real
touch input (tap, tab switching, pinch, drag) and a 10x sim run without
errors.

site/public/index.html

@@ -57,7 +57,8 @@
         <span>The whole plant animated, from PVC intake and the material lab
         through extruder, press, trim, optical inspection, finishing,
         packaging and fulfillment, with the metal path, utilities and energy
-        alongside. Every station is clickable.</span>
+        alongside. Every station is clickable; on a phone, turn it sideways
+        and pinch to zoom.</span>
       </a>
     </li>
   </ul>