feat: snapshot cache + wallet chain sync #293
Merged
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Summary\n- add chain-effect snapshot store (indexedDB + memory) with superjson\n- stabilize WalletCard canvas rendering via pooled canvases + fallback background\n- fix wallet chain preference sync to prevent cross-wallet data mix\n\n## Testing\n- pnpm agent review verify\n\n## Notes\n- lint shows existing warnings (no errors) in chain-effect and miniapp-biobridge (array sort/reverse)