refactor(dapp): wallet-flow hardening + polkadot isolation to migration claim

[drewstone]

Summary

• Harden local wallet-flow runner behavior for deterministic extension/session execution.
• Add robust on-chain operator fallback path in useOperators when GraphQL is empty/unavailable.
• Isolate Substrate/Polkadot dependencies in tangle-dapp to migration-claim only (lazy-loaded route).
• Remove legacy dead substrate-era dapp code paths (unused hooks/utils/components/pages).
• Canonicalize active staking/liquid staking UI amount handling to bigint/viem and remove app-level BN usage.
• Replace key shared UI/address typing surfaces from HexString/isEthereumAddress to viem Hex/isAddress pathways.

Validation

• yarn nx run tangle-dapp:typecheck
• yarn lint
• yarn test
• yarn build
• Branch pre-push hook passed (lint + format + test + build).

Key Outcomes

• @polkadot/* imports are removed from apps/tangle-dapp/src outside pages/claim/migration/**.
• Migration claim remains available via lazy-loaded route only.
• Staking/operator/developer EVM flows continue to build and test green with bigint-based formatting/tx detail handling.

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