feat(tui): add custom bubbletea message types

Co-Authored-By: Charon <charon@lethean.io>

tui/messages.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2017-2026 Lethean (https://lt.hn)
+//
+// Licensed under the European Union Public Licence (EUPL) version 1.2.
+// SPDX-License-Identifier: EUPL-1.2
+
+package tui
+
+import (
+	"time"
+
+	"forge.lthn.ai/core/go-blockchain/types"
+)
+
+// NodeStatusMsg carries a periodic status snapshot from the Node goroutine
+// into the bubbletea update loop.
+type NodeStatusMsg struct {
+	Height     uint64
+	TopHash    types.Hash
+	Difficulty uint64
+	PeerCount  int
+	SyncPct    float64
+	TipTime    time.Time
+}
+
+// ViewChangedMsg tells the footer to update its key hints.
+type ViewChangedMsg struct {
+	Hints []string
+}