fix(model): repair Discord Copilot /model flow

Keep Discord Copilot model switching responsive and current by refreshing picker data from the live catalog when possible, correcting the curated fallback list, and clearing stale controls before the switch completes.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

gateway/platforms/discord.py

@@ -3871,6 +3871,15 @@ if DISCORD_AVAILABLE:
 
             self.resolved = True
             model_id = interaction.data["values"][0]
+            self.clear_items()
+            await interaction.response.edit_message(
+                embed=discord.Embed(
+                    title="⚙ Switching Model",
+                    description=f"Switching to `{model_id}`...",
+                    color=discord.Color.blue(),
+                ),
+                view=None,
+            )
 
             try:
                 result_text = await self.on_model_selected(
@@ -3881,14 +3890,13 @@ if DISCORD_AVAILABLE:
             except Exception as exc:
                 result_text = f"Error switching model: {exc}"
 
-            self.clear_items()
-            await interaction.response.edit_message(
+            await interaction.edit_original_response(
                 embed=discord.Embed(
                     title="⚙ Model Switched",
                     description=result_text,
                     color=discord.Color.green(),
                 ),
-                view=self,
+                view=None,
             )
 
         async def _on_back(self, interaction: discord.Interaction):