Fix: chain properties per each api.

```ts
@Component
export default class ChainMixin extends Vue {
get chainProperties() {
return this.$store.getters['chain/getChainProperties']
}

get decimals(): number {
return this.chainProperties.tokenDecimals
}

get unit(): string {
return this.chainProperties.tokenSymbol
}
}

```

Start by locating the ChainMixin entry point shown in the issue and inspect how chainProperties is obtained from the store. Compare the expected properties for each API, then add or update tests that demonstrate separate decimals and units per API; done means the mixin returns the correct chain-specific values.

Written by the indexing model from the issue text.