docs: clarify GenLayerJS wallet provider flow

[MuncleUscles]

Summary

• Clarifies that the standard GenLayerJS browser write flow uses an EIP-1193 wallet provider and does not require a MetaMask Snap by itself.
• Adds wallet-provider troubleshooting guidance for multi-wallet extension setups and app-level Snap/plugin requirements.
• Updates the dApp writing guide example to pass the browser wallet provider explicitly.

Sanitized evidence basis

Recent builder support discussion showed confusion about whether genlayer-js writes require the GenLayer wallet plugin / MetaMask Snap and whether wallet-extension conflicts such as Rabby are expected. Current docs showed window.ethereum in the API reference but did not explicitly separate the standard SDK provider flow from optional Snap/plugin integrations.

Test plan

• git diff --check
• pnpm build

Note: Created by weekly docs-and-skills gap loop; draft for human review.

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