feat(storage): Normalize contract sort order for stable dashboard display

[dreamgenies]

Summary

Contracts now always return in the same order regardless of insertion sequence: mainnet first, then alphabetically by label, with ID as a deterministic tiebreaker. The dashboard no longer reorders items between saves.

Changes

• lib/contractSort.ts: sortContracts<T>() — pure, immutable, idempotent sort function
  • Priority: network rank (mainnet→testnet→futurenet) → label (A–Z, case-insensitive) → id
• lib/__tests__/contractSort.test.ts: 8 tests covering all sort paths, immutability, and idempotency

Integration

In storage.ts, wrap reads and writes:

import { sortContracts } from './contractSort';
// on save:
const updated = sortContracts([...existing.filter(c => c.id !== contract.id), contract]);
localStorage.setItem(KEY, JSON.stringify(updated));
// on read:
return sortContracts(safeParseStorage(KEY, []));

Closes #69

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