🧚 SDK Preview: [Polkadot api v2 migration ]

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This PR was triggered by SDK upgrade no. 311

For details visit: galacticcouncil/sdk#311

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Lighthouse	1 paths audited Performance: 0 (no change from production) Accessibility: 66 (no change from production) Best Practices: 92 (no change from production) SEO: 91 (no change from production) PWA: 80 (no change from production) View the detailed breakdown and full score reports

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[Divljo31]

• polkadot-api 1.23.3 → ^2.0.2 in deps + resolutions; import moved polkadot-api/ws-provider → polkadot-api/ws.
• Binary class → utility namespace (Binary.toHex / toText); FixedSizeBinary → type-only SizedHex (cast 0x... string, no wrapping).
• All x.asHex() / x.asText() / x.asBytes() call sites rewritten; isBinary now checks Uint8Array.
• Storage watchValue(..., 'best') → watchValue(..., { at: 'best' }) with new { value, block } emission — unwrapped centrally in usePapiValue.
• CompatibilityToken dropped: tx.getEncodedData() is async, no token arg — getPapiTransactionCallData / getTxCallHash became async, callers migrated to useQuery.
• papiCompatibilityToken + isNext removed from provider context; dryRun queryKey switched to safeStringify(tx.decodedCall).
• mergeUint8(a, b, c) varargs → mergeUint8([a, b, c]) array; Sr25519(new FixedSizeBinary(sig)) → Sr25519(Binary.toHex(sig)).
• WS provider collapsed: dropped standalone ws: WsJsonRpcProvider — papiClient: WsPolkadotClient exposes .switch(url) directly (RpcList + isApiLoaded updated).