feat(transfer): show client latest trusted height on render page

The Transfer section listed each client by ID only, making it hard to
tell which client is up-to-date when several track the same chain. Add
a read-only core.ClientLatestHeight accessor and surface it next to each
"send via" link.

Author: tbruyelle

gno.land/r/aib/ibc/apps/transfer/filetests/z0bb_render_home_with_client_filetest.gno

@@ -36,7 +36,7 @@ func main(cur realm) {
 //
 // Trigger an IBC transfer from your wallet. Pick the client of the destination chain:
 //
-// - [send via `07-tendermint-1`](/r/aib/main$help&func=Transfer&amount=&clientID=07-tendermint-1&denom=&memo=&receiver=&timeoutTimestamp=1234571490) ([client details](/r/aib/ibc/core:clients/07-tendermint-1))
+// - [send via `07-tendermint-1`](/r/aib/main$help&func=Transfer&amount=&clientID=07-tendermint-1&denom=&memo=&receiver=&timeoutTimestamp=1234571490) — trusted height `2/2` ([client details](/r/aib/ibc/core:clients/07-tendermint-1))
 //
 // ## Vouchers (0)
 //

gno.land/r/aib/ibc/apps/transfer/render.gno

@@ -187,8 +187,8 @@ func renderTransferLinks() string {
 	out.WriteString("Trigger an IBC transfer from your wallet. Pick the client of the destination chain:\n\n")
 	for _, clientID := range clientIDs {
 		out.WriteString(ufmt.Sprintf(
-			"- [send via `%s`](%s) ([client details](/r/aib/ibc/core:clients/%s))\n",
-			clientID, newTransferLink(clientID, "", "").URL(), clientID,
+			"- [send via `%s`](%s) — trusted height `%s` ([client details](/r/aib/ibc/core:clients/%s))\n",
+			clientID, newTransferLink(clientID, "", "").URL(), core.ClientLatestHeight(clientID), clientID,
 		))
 	}
 

gno.land/r/aib/ibc/core/client.gno

@@ -58,6 +58,19 @@ func ClientIDs() []string {
 	return ids
 }
 
+// ClientLatestHeight returns the latest (highest) consensus height the given
+// client has been updated to, formatted as "<revision>/<height>". This is the
+// client's latest trusted height. Returns "" if the client is unknown.
+// Intended for read-only callers (UIs) that want to surface how up-to-date a
+// client is.
+func ClientLatestHeight(clientID string) string {
+	c := store.getClient(clientID)
+	if c == nil {
+		return ""
+	}
+	return c.lightClient.LatestHeight().String()
+}
+
 // RegisterCounterparty will register the IBC v2 counterparty info for the
 // given clientID. It must be called by the same relayer that called
 // CreateClient.