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/segment_chase.py

@@ -0,0 +1,44 @@
+import utime
+
+
+class SegmentChase:
+    def __init__(self, driver):
+        self.driver = driver
+
+    def run(self, preset):
+        """Independent moving segments (distinct from classic two-color chase).
+
+        n1: segment size (LEDs per segment)
+        n2: step size (phase increment each frame)
+        n3: per-segment phase offset
+        n4: gap spacing inside segment (0 = solid segment)
+        """
+        colors = preset.c if preset.c else [(255, 0, 0), (0, 0, 255)]
+        seg = max(1, int(preset.n1) if int(preset.n1) > 0 else 4)
+        phase_step = max(1, int(preset.n2) if int(preset.n2) > 0 else 1)
+        seg_offset = max(0, int(preset.n3))
+        gap = max(0, int(preset.n4))
+        phase = self.driver.step % 256
+        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):
+                    seg_idx = i // seg
+                    in_seg = i % seg
+                    local_phase = (phase + seg_idx * seg_offset) % seg
+                    lit_idx = (in_seg + local_phase) % seg
+                    if gap > 0 and lit_idx >= max(1, seg - gap):
+                        self.driver.n[i] = (0, 0, 0)
+                    else:
+                        color_idx = seg_idx % len(colors)
+                        self.driver.n[i] = self.driver.apply_brightness(colors[color_idx], preset.b)
+                self.driver.n.write()
+                phase = (phase + phase_step) % seg
+                self.driver.step = phase
+                last = utime.ticks_add(last, d)
+                if not preset.a:
+                    yield
+                    return
+            yield