feat: add sales channels page in seller center and modal in products page in seller center

[albertfolch-redeemeum]

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[cloudflare-workers-and-pages]

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Latest commit:	6879837
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Preview URL:	https://3930eb48.interface-a9d.pages.dev
Branch Preview URL:	https://sell-everywhere.interface-a9d.pages.dev

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[levalleux-ludo]

interface/src/lib/utils/hooks/seller/useUpdateSeller.ts

Line 67 in 5595cc3

await coreSDK.signMetaTxUpdateSellerAndOptIn(newSeller);

• Only meta-transaction mode is implemented, so that it's not possible to run the usecase on the PR deployment preview (as the meta-tx are not activated there). I would rather go for supporting both cases, as it's done for the other type of transactions (see

  interface/src/lib/utils/hooks/seller/useCreateSeller.ts

  Line 90 in 5595cc3

  if (coreSDK.isMetaTxConfigSet) {

  )
• Maybe worth having a pending popup while the transaction is submitted and not completed yet
• It's failing with my seller (ID: 26). Protocol fails with "ERC721: owner query for nonexistent token" error --> see screenshot. I think the problem comes from the AuthTokenId value that is considered to be hexadecimal (then converted to decimal) but it's already a decimal value
  
• salesChannels is updated in the subgraph but deployments array remains empty, so nothing is stored at product level, to know whether a product is added to a salesChannel or not

[levalleux-ludo]

LGTM