feat(types): parent display name suffix via subclass

[CharlVS]

Implements parent-chain disambiguation in SDK.

• Adds CoinSubClass.tokenStandardSuffix (exhaustive switch)
• Adds AssetId.displayName (parent-only) using tokenStandardSuffix
• Wallet uses id.displayName for UI; protocol pill shows "NATIVE" for parents
• Child assets unchanged; no impact on IDs/balances

Context: GLEECBTC/gleec-wallet#2988 (comment)

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[Copilot]

Pull Request Overview

This PR implements parent-chain disambiguation in the SDK by adding token standard suffixes to parent asset display names. The feature helps differentiate between assets with the same name but on different networks.

• Adds a tokenStandardSuffix extension to CoinSubClass with exhaustive switch coverage
• Introduces AssetId.displayName property that appends suffixes for parent assets only
• Provides standardized network abbreviations (ERC20, BEP20, ARB20, etc.) for display disambiguation

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
coin_subclasses.dart	Adds extension with token standard suffix mapping for all coin subclasses
asset_id.dart	Implements displayName getter that conditionally appends network suffixes

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