feat(patterns): add colour cycle, flicker, and flame

Made-with: Cursor

src/patterns/flicker.py

@@ -0,0 +1,40 @@
+import random
+import utime
+
+
+class Flicker:
+    def __init__(self, driver):
+        self.driver = driver
+
+    def run(self, preset):
+        """Random brightness between n1 (min) and b (max); delay d ms between updates."""
+        colors = preset.c if preset.c else [(255, 255, 255)]
+        color_index = 0
+        last_update = utime.ticks_ms()
+
+        def brightness_bounds():
+            lo = max(0, min(255, int(preset.n1)))
+            hi = max(0, min(255, int(preset.b)))
+            if lo > hi:
+                lo, hi = hi, lo
+            return lo, hi
+
+        if not preset.a:
+            lo, hi = brightness_bounds()
+            level = random.randint(lo, hi)
+            base = colors[color_index % len(colors)]
+            self.driver.fill(self.driver.apply_brightness(base, level))
+            yield
+            return
+
+        while True:
+            current_time = utime.ticks_ms()
+            delay_ms = max(1, int(preset.d))
+            lo, hi = brightness_bounds()
+            if utime.ticks_diff(current_time, last_update) >= delay_ms:
+                level = random.randint(lo, hi)
+                base = colors[color_index % len(colors)]
+                self.driver.fill(self.driver.apply_brightness(base, level))
+                color_index += 1
+                last_update = utime.ticks_add(last_update, delay_ms)
+            yield