refactor: move From/To with blockies into Identity block

Move From and To address fields (which include blockie identicons)
from the Value block into the Identity block, per review feedback.
From/To are identity information, not value information. The Value
block now contains only Amount, Native quantity, and Token contract.

README TransactionDetail section updated to match.

README.md

@@ -443,6 +443,10 @@ transitions.
         - Type: transaction classification — one of: Native ETH Transfer, ERC-20
           Token Transfer, Swap, Token Approval, Contract Call, Contract Creation
         - Status: "Success" or "Failed"
+        - From: blockie + color dot + full address (tap to copy) + etherscan
+          link; ENS name if available
+        - To: blockie + color dot + full address (tap to copy) + etherscan link;
+          ENS name if available
     - **Timing block**:
         - Time: ISO datetime + relative age in parentheses
         - Block: block number (tap to copy) + etherscan block link
@@ -451,10 +455,6 @@ transitions.
         - Native quantity: raw integer + unit (shown when available)
         - Token contract: shown for ERC-20 transfers — color dot + full contract
           address (tap to copy) + etherscan token link
-        - From: blockie + color dot + full address (tap to copy) + etherscan
-          link; ENS name if available
-        - To: blockie + color dot + full address (tap to copy) + etherscan link;
-          ENS name if available
     - **Decoded details** (shown for contract calls):
         - Action name, decoded parameters, token details, swap steps
     - **Network details** (shown when on-chain data is available):