docs: replace Python demo with CLI one-liner for smooth movement

Swap the Python smooth_demo.py script in the Tip with a pure bash
snippet using the kernel CLI. Users can copy-paste and run immediately
without creating any files.

Made-with: Cursor

Author: ulziibay-kernel

browsers/computer-controls.mdx

@@ -6,25 +6,25 @@ description: "Control the computer's mouse, keyboard, and screen"
 Use OS-level controls to move and click the mouse, type and press keys, scroll, drag, and capture screenshots from a running browser session.
 
 <Tip>
-Smooth movement is enabled by default — every `moveMouse` and `dragMouse` call already uses [Bézier curves](https://en.wikipedia.org/wiki/B%C3%A9zier_curve). Run this script and open the [live view](/browsers/live-view) link to watch it in action:
-
-```python smooth_demo.py
-from kernel import Kernel
-import time, urllib.request
-
-k = Kernel()
-b = k.browsers.create()
-print(f"\n  Watch live: {b.live_view_url}\n")
-
-html = urllib.request.urlopen(
-    "https://gist.githubusercontent.com/ulziibay-kernel/f6d8063ba223a81293cfe1fde06d8624/raw/cursor-trail-demo.html"
-).read().decode()
-k.browsers.playwright.execute(id=b.session_id, code="await page.setContent(" + repr(html) + ");")
-input("Press Enter when live view is open...")
-
-for x, y in [(200, 200), (900, 150), (1700, 250), (1700, 700), (960, 800), (200, 750), (500, 480), (1400, 480)]:
-    k.browsers.computer.move_mouse(id=b.session_id, x=x, y=y, duration_ms=1200)
-    time.sleep(0.3)
+Smooth movement is enabled by default — every `moveMouse` and `dragMouse` call already uses [Bézier curves](https://en.wikipedia.org/wiki/B%C3%A9zier_curve). Open [live view](/browsers/live-view) and paste this to see the difference:
+
+```bash
+kernel upgrade  # requires CLI v0.15.4+
+ID=$(kernel browsers create --json | jq -r '.session_id')
+echo "Open live view: https://dashboard.onkernel.com/browsers/$ID"
+sleep 3
+
+echo "=== Smooth (Bezier curves) ==="
+for coords in "200 200" "900 150" "1700 250" "1700 700" "960 800" "200 750"; do
+  kernel browsers computer move-mouse $ID --x ${coords% *} --y ${coords#* } --duration-ms 1200
+  sleep 0.3
+done
+
+echo "=== Instant (teleport) ==="
+for coords in "200 200" "900 150" "1700 250" "1700 700" "960 800" "200 750"; do
+  kernel browsers computer move-mouse $ID --x ${coords% *} --y ${coords#* } --smooth=false
+  sleep 0.5
+done
 ```
 </Tip>