fix(patterns): correct non-blocking timing and blink off phase

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

src/patterns/orbit.py

@@ -15,8 +15,9 @@ class Orbit:
             d = max(1, int(preset.d))
             now = utime.ticks_ms()
             if utime.ticks_diff(now, last) >= d:
+                bg_color = self.driver.apply_brightness(colors[-1], preset.b)
                 for i in range(self.driver.num_leds):
-                    self.driver.n[i] = (0, 0, 0)
+                    self.driver.n[i] = bg_color
                 for k in range(orbits):
                     idx = ((phase * (k + 1)) // 8 + (k * self.driver.num_leds // max(1, orbits))) % max(1, self.driver.num_leds)
                     self.driver.n[idx] = self.driver.apply_brightness(colors[k % len(colors)], preset.b)