feat(patterns): merge pattern styles and add mode support

Consolidate legacy pattern ids into meteor, particles, sparkle, chase,
and colour_cycle with n6/mode style selection; add pattern_modes helper,
self-contained tests/all.py, and preset mode alias on wire.

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

src/patterns/pattern_modes.py

@@ -0,0 +1,18 @@
+"""Resolve pattern style from n6 or legacy preset pattern id (p)."""
+
+
+def style_mode(preset, default=0, legacy=None):
+    legacy = legacy or {}
+    p = getattr(preset, "p", "") or ""
+    if p in legacy:
+        return legacy[p]
+    mode = getattr(preset, "mode", None)
+    if mode is None and isinstance(preset, dict):
+        mode = preset.get("mode")
+    if mode is not None:
+        try:
+            return int(mode)
+        except (TypeError, ValueError):
+            pass
+    n6 = int(getattr(preset, "n6", 0) or 0)
+    return n6 if n6 > 0 else default