tone3000: IR downloads, model detail, arch filter, metadata

- NAM/IR tab toggle in Downloads overlay
- Architecture filter (All/Nano/Feather/Standard) - filters via
  Supabase architecture_version column
- Model detail overlay: tap a search result to see full description,
  gear info, author, pack, architecture, thumbnail before downloading
- IR search + install with .meta.json metadata saving
- Backend: search_models/get_trending_models accept arch param
- Backend: tone_gear field added to model search response

src/web/server.py

@@ -1751,7 +1751,7 @@ class WebServer:
             return {"online": ok}
 
         @app.get("/api/models/tonedownload/search")
-        async def tonedownload_search_models(q: str = "", page: int = 0):
+        async def tonedownload_search_models(q: str = "", page: int = 0, arch: str = ""):
             """Search Tone3000 for NAM models."""
             try:
                 client = await self._get_tonedownload()
@@ -1764,10 +1764,11 @@ class WebServer:
                             "message": "Tone3000 unavailable - using local defaults",
                         },
                     )
+                arch_val = arch.strip() or None
                 if not q.strip():
-                    results = await client.get_trending_models()
+                    results = await client.get_trending_models(arch=arch_val)
                 else:
-                    results = await client.search_models(q.strip(), page=page)
+                    results = await client.search_models(q.strip(), page=page, arch=arch_val)
                 return {
                     "results": [
                         {
@@ -1781,6 +1782,7 @@ class WebServer:
                             "thumbnail": r.thumbnail_url,
                             "download_url": r.download_url,
                             "tone_description": r.tone_description,
+                            "tone_gear": r.tone_gear,
                             "pack_name": r.pack_name,
                             "architecture": r.architecture,
                             "created_at": r.created_at,
@@ -1995,6 +1997,23 @@ class WebServer:
             path = await client.download_ir(ir)
             if not path:
                 raise HTTPException(status_code=500, detail="Download failed")
+            # Save IR metadata
+            import json
+            meta = {
+                "id": data.get("id"),
+                "name": data.get("name"),
+                "filename": data.get("filename"),
+                "size_bytes": data.get("size"),
+                "author": data.get("author"),
+                "author_avatar": data.get("author_avatar"),
+                "thumbnail": data.get("thumbnail"),
+                "tone_description": data.get("tone_description"),
+                "created_at": data.get("created_at"),
+                "download_date": datetime.datetime.now().isoformat(),
+                "source": "tone3000",
+            }
+            meta_path = path.with_suffix(".meta.json")
+            meta_path.write_text(json.dumps(meta, indent=2))
             ir_loader = self.deps.ir_loader
             if ir_loader:
                 ir_loader.get_irs()