feat: About Us boards, Mr Mohammadi guide and products-hall orders

- Information boards in the factory yard (about, contact, address) painted from the
  company config; E opens the same sections the start screen shows.
- Mr Mohammadi welcomes the family at his desk on every visit with the company story;
  meeting him is a mission step.
- Products hall gets a purchase-request button and a sales contact link.
- New missions: About Us tour (read, meet, read) and products tour (view, ask, request).
  The About and Products start modes lead with their tour.
- Factory points share the station shape so the arrow, route and chip point at them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/pages/game/GameDialogs.jsx

@@ -8,6 +8,7 @@ import { UpdateNotice } from './UpdateNotice.jsx';
 import { EndDialog } from './EndDialog.jsx';
 import { GpsFallbackDialog } from './GpsFallbackDialog.jsx';
 import { MachineCard } from './MachineCard.jsx';
+import { AboutBoardSheet } from './AboutBoardSheet.jsx';
 /** Composes independently managed game dialogs. */
 export function GameDialogs(props) {
   return (
@@ -22,6 +23,7 @@ export function GameDialogs(props) {
       <EndDialog {...props} />
       <GpsFallbackDialog {...props} />
       <MachineCard {...props} />
+      <AboutBoardSheet {...props} />
     </>
   );
 }