feat(ui): pattern modes, bundles, and zone content kind

Add profile/preset/sequence JSON import and export; map preset mode to
wire n6 with a mode dropdown for multi-mode patterns; zone edit shows
presets or sequences only with content_kind on save; update catalogue
and tests for merged pattern names.

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

src/util/binary_envelope.py

@@ -43,6 +43,8 @@ import json
 import struct
 from typing import Any, Dict, List, Optional, Tuple
 
+from util.espnow_message import wire_n6
+
 BINARY_ENVELOPE_VERSION_1 = 1
 BINARY_ENVELOPE_VERSION_2 = 2
 HEADER_LEN = 5
@@ -108,7 +110,7 @@ def _pack_preset_dict(name: str, preset: Dict[str, Any]) -> bytes:
     n3 = _clamp_i16(preset.get("n3", 0))
     n4 = _clamp_i16(preset.get("n4", 0))
     n5 = _clamp_i16(preset.get("n5", 0))
-    n6 = _clamp_i16(preset.get("n6", 0))
+    n6 = _clamp_i16(wire_n6(preset))
     parts.append(
         struct.pack(
             "<HBBhhhhhh",