Nebula monitor: typing terminal cursor, stronger impact, tame pointer, restore mobile streamers

- Replace the centered dash with a tiny CSS terminal in the screen: types 'such'
  once, backspaces, then the caret blinks on the left (steps() width typewriter).
- Impact pulse is snappier and brighter (0.9s ping, scale 1.14, bright cyan glow)
  so streamer hits actually read; the screen color shifts with it.
- Pointer parallax dialed down to a subtle 6px with a gentler spring, fixing the
  desktop 'shift up-left after load' (it was easing toward the cursor on first move).
- Revert the mobile streamer thinning/density cut from the prior commit: it made
  them too sparse to see. Mobile now gets the full set at full weight, like desktop.

apps/web/src/app/globals.css

@@ -234,6 +234,24 @@
 @keyframes splash-zoom { 0% { transform: scale(1); } 50% { transform: scale(1.06); } 100% { transform: scale(1.14); } }
 .splash-zoom { animation: splash-zoom 0.8s ease-in-out forwards; }
 
-/* Blinking terminal cursor inside the nebula monitor (opacity only = compositor). */
-@keyframes nebula-cursor-blink { 0%, 49% { opacity: 0.85; } 50%, 100% { opacity: 0; } }
-.nebula-cursor { animation: nebula-cursor-blink 1.1s steps(1, end) infinite; }
+/* Tiny terminal inside the nebula monitor: type "such" once, backspace, then a blinking
+   caret on the left. width via steps() is the typewriter; border-right is the caret. */
+.nebula-term {
+  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
+  font-size: 9px;
+  line-height: 1;
+  letter-spacing: 0.5px;
+  white-space: nowrap;
+  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;
+}
+@keyframes nebula-type {
+  0% { width: 0; }
+  16% { width: 4ch; }
+  60% { width: 4ch; }
+  74% { width: 0; }
+  100% { width: 0; }
+}
+@keyframes nebula-caret { 50% { border-color: transparent; } }