Admin user editing, knight-rider demos, self-contained user seeds

Co-authored-by: Cursor <cursoragent@cursor.com>

workspace/code/pattern_rainbow_demo.py

@@ -1,13 +1,40 @@
-"""Rainbow pattern demo using led_patterns helpers."""
+"""Rainbow NeoPixel sweep — self-contained (stdlib + simulated hardware only)."""
+
+import time
 
 from machine import Pin
 import neopixel
-import time
 
-from led_patterns import rainbow_frame
+# --- helpers (same logic as bundled led_patterns.py, inlined here)
 
 
-np = neopixel.NeoPixel(Pin(4), 256)
+def _clamp(channel: int) -> int:
+    return max(0, min(255, int(channel)))
+
+
+def wheel(pos: int):
+    """Return rainbow RGB at position 0–255."""
+    pos = 255 - (pos & 255)
+    if pos < 85:
+        return (_clamp(255 - pos * 3), 0, _clamp(pos * 3))
+    if pos < 170:
+        pos -= 85
+        return (0, _clamp(pos * 3), _clamp(255 - pos * 3))
+    pos -= 170
+    return (_clamp(pos * 3), _clamp(255 - pos * 3), 0)
+
+
+def rainbow_frame(led_count: int, frame: int, step: int = 4):
+    if led_count <= 0:
+        return []
+    return [wheel((i * 256 // led_count + frame * step) & 255) for i in range(led_count)]
+
+
+# --- demo
+
+NUM_LEDS = 16
+
+np = neopixel.NeoPixel(Pin(4), NUM_LEDS)
 
 for frame in range(120):
     frame_colors = rainbow_frame(len(np), frame, step=5)