Fewer, smaller messages: mold percentages, markers for machine heat, short status lines

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

src/sim/machine-tick.js

@@ -82,11 +82,11 @@ function machinesTick() {
     const sat = POWER_FREE ? 1 : net ? net.sat : 0;
     mm.angle += sat * 0.5 * (mm.on ? 1 : 0);
     if (mm.on && sat > 0.05) fanBlow(mm, sat);
-    // a fan getting close to melting says so (once every few seconds)
+    // Keep the measured heat for the marker and hover panel.
     if ((tick + mm.id) % 30 === 0) {
       let hotT = 0;
       for (let y = mm.y; y < mm.y + 4; y++) for (let x = mm.x; x < mm.x + 4; x++) { const tt = temp[y * W + x]; if (tt > hotT) hotT = tt; }
-      if (hotT > 760 && (!mm.warnT || tick - mm.warnT > 600)) { mm.warnT = tick; emit({ t: 'toast', text: `A fan is at ${Math.round(hotT)}°C and melts at 1085°C. Move it out of the heat: outside the furnace wall, blowing in through a grate.` }); }
+      mm.hot = Math.round(hotT);
     }
   }
   // belts and filters move what rests on them every other tick: half a grain per tick
@@ -118,7 +118,7 @@ function machinesTick() {
       if (m === EMPTY || PH[m] !== PH_POWDER) { if (m === EMPTY || PH[m] !== PH_SOLID) tubeIntake(i, p, dx, dy); continue; }
       if (stamp[i] === tickStamp) continue;
       if (temp[i] > 1000 && rnd() < 0.02) {
-        part[i] = 0; markPow(i, false); emit({ t: 'toast', text: 'A screw tube melted. Copper softens around 1000°C.' }); wakeIdx(i);
+        part[i] = 0; markPow(i, false); emit({ t: 'warn', x: i % W, y: (i / W) | 0, text: 'melted' }); wakeIdx(i);
         continue;
       }
       const s = netSat(i);