feat(wallet): add recipient address to payment card UI

Enhanced the payment timeline card to display the recipient/sender address:
- Added truncatedToAddress and truncatedFromAddress to TimelineItemPaymentContent
- New truncateAddress() helper (first 8 + last 6 chars)
- Payment card now shows "To: addr_tes...ytjqp" for sent payments
- And "From: addr_tes...pd0hq" for received payments
- Updated wrapper to expose new properties

The card now displays:
- Amount in ADA (large, bold)
- Sent/Received indicator with Cardano icon
- Truncated recipient/sender address
- Status chip (Pending/Confirmed/Failed with icons)
- Truncated tx hash (tappable to CardanoScan)
- Testnet badge when applicable
- "View on CardanoScan →" link for confirmed transactions

features/wallet/api/src/main/kotlin/io/element/android/features/wallet/api/timeline/TimelineItemPaymentContent.kt

@@ -64,6 +64,18 @@ data class TimelineItemPaymentContent(
             }
         }
 
+    /**
+     * Truncated recipient address for display (first 8 + last 6 chars).
+     */
+    val truncatedToAddress: String
+        get() = truncateAddress(toAddress)
+
+    /**
+     * Truncated sender address for display (first 8 + last 6 chars).
+     */
+    val truncatedFromAddress: String
+        get() = truncateAddress(fromAddress)
+
     /**
      * CardanoScan URL for viewing the transaction.
      */
@@ -93,5 +105,16 @@ data class TimelineItemPaymentContent(
                 "$formatted ADA"
             }
         }
+
+        /**
+         * Truncate a Cardano address for display (first 8 + last 6 chars).
+         */
+        fun truncateAddress(address: String): String {
+            return if (address.length > 18) {
+                "${address.take(8)}...${address.takeLast(6)}"
+            } else {
+                address
+            }
+        }
     }
 }