fix: pass block number hint to verify-deposit for faster verification

- Get block number from finalized block hash in frontend
- Pass as hint to verify-deposit-telegram to avoid 100-block scan
- Improve error message extraction in callEdgeFunction

src/components/p2p/DepositWithdrawModal.tsx

@@ -102,12 +102,15 @@ export function DepositWithdrawModal({
         tx = (assetHubApi.tx.assets as any).transfer(1, PLATFORM_WALLET, amountPlanck.toString());
       }
 
-      // Send TX and wait for finalization
+      // Send TX and wait for finalization, capture block number for fast verification
-      const txHash = await new Promise<string>((resolve, reject) => {
+      const { txHash, blockNumber } = await new Promise<{
+        txHash: string;
+        blockNumber: number;
+      }>((resolve, reject) => {
         tx.signAndSend(
           keypair,
           // eslint-disable-next-line @typescript-eslint/no-explicit-any
-          (result: any) => {
+          async (result: any) => {
             if (result.dispatchError) {
               if (result.dispatchError.isModule) {
                 const decoded = assetHubApi!.registry.findMetaError(result.dispatchError.asModule);
@@ -118,7 +121,17 @@ export function DepositWithdrawModal({
               return;
             }
             if (result.status.isFinalized) {
-              resolve(result.txHash.toHex());
+              try {
+                // Get block number from finalized block hash for fast verification
+                const header = await assetHubApi!.rpc.chain.getHeader(result.status.asFinalized);
+                resolve({
+                  txHash: result.txHash.toHex(),
+                  blockNumber: header.number.toNumber(),
+                });
+              } catch {
+                // Fallback: resolve without block number
+                resolve({ txHash: result.txHash.toHex(), blockNumber: 0 });
+              }
             }
           }
         ).catch(reject);
@@ -127,7 +140,13 @@ export function DepositWithdrawModal({
       // TX finalized, now verify deposit on backend
       setDepositStep('verifying');
 
-      const result = await verifyDeposit(sessionToken, txHash, depositToken, amount);
+      const result = await verifyDeposit(
+        sessionToken,
+        txHash,
+        depositToken,
+        amount,
+        blockNumber || undefined
+      );
 
       setDepositResult({ amount: result.amount, token: result.token });
       setDepositStep('success');

src/lib/p2p-api.ts

@@ -106,12 +106,19 @@ async function callEdgeFunction<T>(
 
   if (error) {
     let msg = error.message || 'Unknown error';
-    if (error.context?.body) {
+    // Try to extract the actual error from response body
+    const body =
+      error.context?.body ??
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      (error as any)?.body ??
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      (error as any)?.responseBody;
+    if (body) {
       try {
-        const parsed = JSON.parse(error.context.body);
+        const parsed = typeof body === 'string' ? JSON.parse(body) : body;
         if (parsed.error) msg = parsed.error;
       } catch {
-        if (typeof error.context.body === 'string') msg = error.context.body;
+        if (typeof body === 'string' && body.length < 500) msg = body;
       }
     }
     throw new Error(msg);