Align controller backend and data with new presets

Update palettes, profiles, tabs, preset sending, and ESPNow message format to match the new preset defaults and driver short-field schema.

src/models/profile.py

@@ -1,21 +1,45 @@
 from models.model import Model
+from models.pallet import Palette
+
 
 class Profile(Model):
     def __init__(self):
+        """Profile model.
+
+        Each profile owns a single, unique palette stored in the Palette model.
+        The profile stores a `palette_id` that points to its palette; any legacy
+        inline `palette` arrays are migrated to a dedicated Palette entry.
+        """
         super().__init__()
+        self._palette_model = Palette()
+
+        # Migrate legacy inline palettes to separate Palette entries.
+        changed = False
+        for pid, pdata in list(self.items()):
+            if isinstance(pdata, dict):
+                if "palette" in pdata and "palette_id" not in pdata:
+                    colors = pdata.get("palette") or []
+                    palette_id = self._palette_model.create(colors=colors)
+                    pdata.pop("palette", None)
+                    pdata["palette_id"] = str(palette_id)
+                    changed = True
+        if changed:
+            self.save()
 
     def create(self, name="", profile_type="tabs"):
-        """
-        Create a new profile.
+        """Create a new profile and its own empty palette.
+
         profile_type: "tabs" or "scenes" (ignoring scenes for now)
         """
         next_id = self.get_next_id()
+        # Create a unique palette for this profile.
+        palette_id = self._palette_model.create(colors=[])
         self[next_id] = {
             "name": name,
             "type": profile_type,  # "tabs" or "scenes"
             "tabs": [],  # Array of tab IDs
             "scenes": [],  # Array of scene IDs (for future use)
-            "palette": []
+            "palette_id": str(palette_id),
         }
         self.save()
         return next_id