feat(patterns): add expanded animation pack with smoke tests

Add a broad set of new pattern modules and matching pattern smoke scripts so the new effects can be validated directly on-device.

src/patterns/fireflies.py

@@ -0,0 +1,34 @@
+import random
+import utime
+
+
+class Fireflies:
+    def __init__(self, driver):
+        self.driver = driver
+
+    def run(self, preset):
+        colors = preset.c if preset.c else [(255, 210, 80), (120, 255, 120)]
+        count = max(1, int(preset.n1) if int(preset.n1) > 0 else 6)
+        speed = max(1, int(preset.n2) if int(preset.n2) > 0 else 8)
+        bugs = [[random.randint(0, max(0, self.driver.num_leds - 1)), random.randint(0, 255)] for _ in range(count)]
+        last = utime.ticks_ms()
+        while True:
+            d = max(1, int(preset.d))
+            now = utime.ticks_ms()
+            if utime.ticks_diff(now, last) >= d:
+                for i in range(self.driver.num_leds):
+                    self.driver.n[i] = (0, 0, 0)
+                for b in bugs:
+                    idx, ph = b
+                    tri = 255 - abs(128 - ph) * 2
+                    c = self.driver.apply_brightness(colors[idx % len(colors)], preset.b)
+                    self.driver.n[idx] = ((c[0]*tri)//255, (c[1]*tri)//255, (c[2]*tri)//255)
+                    b[1] = (ph + speed) & 255
+                    if random.randint(0, 31) == 0:
+                        b[0] = random.randint(0, max(0, self.driver.num_leds - 1))
+                self.driver.n.write()
+                last = utime.ticks_add(last, d)
+                if not preset.a:
+                    yield
+                    return
+            yield