feat(folio): testTag identity for AccountName and ledger row cells

Replaces string-heuristic identity in the spec extractors with stable
testTags. AccountCard exposes AccountName; LedgerRow exposes TxnNote
and TxnDate. Spec extractors read those directly instead of filtering
visible text by "starts with $" / "matches digit".

examples/folio/app/shared/src/commonMain/kotlin/app/folio/feature/home/HomeScreen.kt

@@ -151,6 +151,7 @@ private fun AccountCard(
                 color = t.text,
                 maxLines = 1,
                 overflow = TextOverflow.Ellipsis,
+                modifier = Modifier.testTag("AccountName"),
             )
             Text(txnLabel, style = Type.caption, color = t.textMuted)
         }

examples/folio/app/shared/src/commonMain/kotlin/app/folio/feature/ledger/LedgerScreen.kt

@@ -163,8 +163,9 @@ private fun TxnRow(type: TxnType, amount: Long, note: String, date: String) {
                 color = t.text,
                 maxLines = 1,
                 overflow = TextOverflow.Ellipsis,
+                modifier = Modifier.testTag("TxnNote"),
             )
-            Text(date, style = Type.caption, color = t.textFaint)
+            Text(date, style = Type.caption, color = t.textFaint, modifier = Modifier.testTag("TxnDate"))
         }
         Text(
             formatCents(signed, signed = true),