Show exact amounts and address titles in transaction detail

- Display full-precision amount (no 4-decimal truncation) in the
  transaction detail view, with native quantity (wei/base units) below
- Both amount and native quantity are click-copyable
- Show wallet/address title above from/to when the address is ours
- Update README Display Consistency to document the exception

README.md

@@ -118,12 +118,20 @@ click it.
 #### Display Consistency
 
 The same data must be formatted identically everywhere it appears. Token and ETH
-amounts are always displayed with exactly 4 decimal places (e.g. "1.0500 ETH",
-"17.1900 USDT") — in balance lists, transaction lists, transaction details, send
-confirmations, and any other context. Timestamps include both an ISO datetime
-and a humanized relative age wherever shown. If a formatting rule applies in one
-place, it applies in every place. Users should never see the same value rendered
-differently on two screens.
+amounts are displayed with exactly 4 decimal places (e.g. "1.0500 ETH", "17.1900
+USDT") in balance lists, transaction lists, send confirmations, and approval
+screens. Timestamps include both an ISO datetime and a humanized relative age
+wherever shown. If a formatting rule applies in one place, it applies in every
+place. Users should never see the same value rendered differently on two
+screens.
+
+**Exception — Transaction Detail view:** The transaction detail screen is the
+authoritative record of a specific transaction and shows the exact, untruncated
+amount with all meaningful decimal places (e.g. "0.00498824598498216 ETH"). It
+also shows the native quantity (e.g. "4988245984982160 wei") below it. Both are
+click-copyable. Truncating to 4 decimals in summary views is acceptable for
+scannability, but the detail view must never discard precision — it is the one
+place the user goes to verify exact figures.
 
 #### Language & Labeling