fix: update preset NAM block path when loading a model globally

/api/models/load now also updates the current preset's NAM Amp
block(s) nam_model_path, so the UI block reflects the loaded model.

src/web/server.py

@@ -1239,7 +1239,12 @@ class WebServer:
 
         @app.post("/api/models/load")
         async def load_model(data: dict, channel: str = "guitar"):
-            """Load a NAM model by path for the given channel."""
+            """Load a NAM model by path for the given channel.
+
+            Also updates the current preset's NAM Amp block(s) nam_model_path
+            so the block UI reflects the newly loaded model.
+            """
+            from ..presets.types import Channel
             _pm, _pl, nam, _ir = self._channel_deps(channel)
             if not nam:
                 raise HTTPException(status_code=503)
@@ -1250,6 +1255,24 @@ class WebServer:
             if not ok:
                 detail = nam.last_error or "Failed to load model"
                 raise HTTPException(status_code=422, detail=detail)
+
+            # Also update the current preset's NAM Amp blocks to match
+            if _pm is not None:
+                try:
+                    bank = _pm.current_bank
+                    program = _pm.current_program
+                    preset = _pm.load(bank, program, channel=Channel(channel))
+                    changed = False
+                    for b in preset.chain:
+                        if b.fx_type.value == "nam_amp" or b.nam_model_path:
+                            if b.nam_model_path != path:
+                                b.nam_model_path = path
+                                changed = True
+                    if changed:
+                        _pm.save(preset, channel=Channel(channel))
+                except Exception:
+                    logger.warning("Failed to update preset NAM block path", exc_info=True)
+
             await self._manager.broadcast({
                 "type": "model_loaded",
                 "model": path,