Update pattern tests for new preset-based API

- Replace add() calls with edit() for preset creation
- Update tests to work with merged patterns.py
- Ensure all tests use new Preset object structure

test/patterns/blink.py

@@ -14,7 +14,7 @@ def main():
     wdt = WDT(timeout=10000)
     
     # Create blink preset
-    p.add("test_blink", {
+    p.edit("test_blink", {
         "pattern": "blink",
         "brightness": 64,
         "delay": 200,