Nebula: fatten mobile streamers (undo aspect-squish), fade out the cursor

- Streamers were rendering and hitting the monitor but invisible on phones:
  preserveAspectRatio=none squishes the stroke horizontally on a narrow viewport,
  so 0.12 went sub-pixel. Fatten 2.5x on mobile so they actually show.
- Terminal cursor now types 'such', backspaces, blinks ~6 times, then fades out
  completely instead of blinking forever (it was distracting).

apps/web/src/app/globals.css

@@ -245,13 +245,19 @@
   overflow: hidden;
   width: 0;
   border-right: 1.5px solid currentColor;
-  animation: nebula-type 5s steps(4, end) forwards, nebula-caret 0.9s steps(1, end) infinite;
+  /* type "such", hold, backspace (nebula-type, once); blink a finite number of times
+     (nebula-caret); then fade the whole thing out so it stops being distracting. */
+  animation:
+    nebula-type 3s steps(4, end) forwards,
+    nebula-caret 0.8s steps(1, end) 10,
+    nebula-term-out 0.6s ease-in 7.4s forwards;
 }
 @keyframes nebula-type {
   0% { width: 0; }
-  16% { width: 4ch; }
+  27% { width: 4ch; }
-  60% { width: 4ch; }
+  67% { width: 4ch; }
-  74% { width: 0; }
+  87% { width: 0; }
   100% { width: 0; }
 }
-@keyframes nebula-caret { 50% { border-color: transparent; } }
+@keyframes nebula-caret { 0%, 50% { border-color: currentColor; } 50.01%, 100% { border-color: transparent; } }
+@keyframes nebula-term-out { to { opacity: 0; } }

packages/ui/src/procedural/nebula-field.tsx

@@ -284,7 +284,10 @@ export const NebulaField = ({ className, density = 8, themeMode = 'dark', positi
             d={d}
             themeMode={themeMode}
             onHit={handleHit}
-            width={themeMode === 'light' ? 0.08 : 0.12}
+            // preserveAspectRatio="none" squishes the stroke horizontally on a narrow
+            // phone, so the thin lines render sub-pixel and vanish. Fatten them on
+            // mobile to compensate (dial: the 2.5x factor).
+            width={(themeMode === 'light' ? 0.08 : 0.12) * (isMobile ? 2.5 : 1)}
             index={i}
           />
         ))}