Add SDK type augmentation utilities

[snigdhachoudhury]

Problem

I noticed there are a bunch of TypeScript type safety issues coming from the OpenFoodFacts SDK types. Right now, they’re being ignored using @ts-expect-error in a few places like ProductHeader.svelte, +page.ts, and +page.svelte.

Some examples:

nutriments field isn’t typed correctly
knowledge_panels_client is being used but isn’t part of the official types
There are some workarounds with UiProduct casting

Because of this, strict TypeScript checks aren’t really working properly, and autocomplete/IDE support also takes a hit

Proposed solution

I tried to fix this by properly handling the types instead of suppressing errors.

• Created extended product types to better match actual API responses
• Fixed the nutriments field by introducing a proper Nutriments type
• Added support for knowledge_panels_client in typing
• Removed the need for @ts-expect-error in these files

Additional context

The issue seems to come from incomplete type definitions in the OpenFoodFacts SDK (v2.0.0-alpha.29). The API returns more fields than what’s currently typed, which leads to these mismatches.

Part of

Related to improving code quality and type safety across the codebase