feat: asset-based image/video sources, notification sounds, UI improvements

- Replace URL-based image_source/url fields with image_asset_id/video_asset_id
  on StaticImagePictureSource and VideoCaptureSource (clean break, no migration)
- Resolve asset IDs to file paths at runtime via AssetStore.get_file_path()
- Add EntitySelect asset pickers for image/video in stream editor modal
- Add notification sound configuration (global sound + per-app overrides)
- Unify per-app color and sound overrides into single "Per-App Overrides" section
- Persist notification history between server restarts
- Add asset management system (upload, edit, delete, soft-delete)
- Replace emoji buttons with SVG icons throughout UI
- Various backend improvements: SQLite stores, auth, backup, MQTT, webhooks

server/src/wled_controller/api/routes/pattern_templates.py

@@ -53,8 +53,8 @@ async def list_pattern_templates(
         responses = [_pat_template_to_response(t) for t in templates]
         return PatternTemplateListResponse(templates=responses, count=len(responses))
     except Exception as e:
-        logger.error(f"Failed to list pattern templates: {e}")
-        raise HTTPException(status_code=500, detail=str(e))
+        logger.error("Failed to list pattern templates: %s", e, exc_info=True)
+        raise HTTPException(status_code=500, detail="Internal server error")
 
 
 @router.post("/api/v1/pattern-templates", response_model=PatternTemplateResponse, tags=["Pattern Templates"], status_code=201)
@@ -83,8 +83,8 @@ async def create_pattern_template(
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
     except Exception as e:
-        logger.error(f"Failed to create pattern template: {e}")
-        raise HTTPException(status_code=500, detail=str(e))
+        logger.error("Failed to create pattern template: %s", e, exc_info=True)
+        raise HTTPException(status_code=500, detail="Internal server error")
 
 
 @router.get("/api/v1/pattern-templates/{template_id}", response_model=PatternTemplateResponse, tags=["Pattern Templates"])
@@ -131,8 +131,8 @@ async def update_pattern_template(
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
     except Exception as e:
-        logger.error(f"Failed to update pattern template: {e}")
-        raise HTTPException(status_code=500, detail=str(e))
+        logger.error("Failed to update pattern template: %s", e, exc_info=True)
+        raise HTTPException(status_code=500, detail="Internal server error")
 
 
 @router.delete("/api/v1/pattern-templates/{template_id}", status_code=204, tags=["Pattern Templates"])
@@ -162,5 +162,5 @@ async def delete_pattern_template(
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
     except Exception as e:
-        logger.error(f"Failed to delete pattern template: {e}")
-        raise HTTPException(status_code=500, detail=str(e))
+        logger.error("Failed to delete pattern template: %s", e, exc_info=True)
+        raise HTTPException(status_code=500, detail="Internal server error")