fix: SFTP auto-refresh after file transfer

- Added program *tea.Program to SFTPBrowserTab and Model
- SetProgram() allows goroutines to send messages to Bubble Tea
- After transfer: program.Send(sftpRefreshMsg{}) triggers re-render
- Model stores program reference, passes to SFTP tab on creation

pkg/tui/tui.go

@@ -27,6 +27,7 @@ type Model struct {
 	Error         error
 	Quit          bool
 	dataDir       string
+	program       *tea.Program
 }
 
 // New creates a new TUI model
@@ -47,6 +48,11 @@ func (m *Model) Init() tea.Cmd {
 	return m.tabs.Init()
 }
 
+// SetProgram stores a reference to the tea.Program for sending messages from goroutines
+func (m *Model) SetProgram(p *tea.Program) {
+	m.program = p
+}
+
 // Update handles messages and updates the model
 func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	switch msg := msg.(type) {
@@ -82,6 +88,9 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 	case openSFTPMsg:
 		tab := NewSFTPBrowserTab(msg.host, m.dataDir)
+		if m.program != nil {
+			tab.SetProgram(m.program)
+		}
 		cmd := m.tabs.Add(tab)
 		return m, cmd