fix(tui): up/down arrow handling

packages/tui/internal/components/chat/editor.go

@@ -83,13 +83,13 @@ func (m *editorComponent) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				if m.historyIndex == -1 {
 					// Save current text before entering history
 					m.currentText = m.textarea.Value()
-					m.textarea.CursorStart()
+					m.textarea.MoveToBegin()
 				}
 				// Move up in history (older messages)
 				if m.historyIndex < len(m.app.State.MessageHistory)-1 {
 					m.historyIndex++
 					m.RestoreFromHistory(m.historyIndex)
-					m.textarea.CursorStart()
+					m.textarea.MoveToBegin()
 				}
 				return m, nil
 			}
@@ -105,11 +105,11 @@ func (m *editorComponent) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 					m.currentText = ""
 				} else {
 					m.RestoreFromHistory(m.historyIndex)
-					m.textarea.CursorEnd()
+					m.textarea.MoveToEnd()
 				}
 				return m, nil
 			} else if m.historyIndex > -1 {
-				m.textarea.CursorEnd()
+				m.textarea.MoveToEnd()
 				return m, nil
 			}
 		}

packages/tui/internal/components/textarea/textarea.go

@@ -1430,14 +1430,14 @@ func (m Model) Width() int {
 	return m.width
 }
 
-// moveToBegin moves the cursor to the beginning of the input.
-func (m *Model) moveToBegin() {
+// MoveToBegin moves the cursor to the beginning of the input.
+func (m *Model) MoveToBegin() {
 	m.row = 0
 	m.SetCursorColumn(0)
 }
 
-// moveToEnd moves the cursor to the end of the input.
-func (m *Model) moveToEnd() {
+// MoveToEnd moves the cursor to the end of the input.
+func (m *Model) MoveToEnd() {
 	m.row = len(m.value) - 1
 	m.SetCursorColumn(len(m.value[m.row]))
 }
@@ -1626,9 +1626,9 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 		case key.Matches(msg, m.KeyMap.WordBackward):
 			m.wordLeft()
 		case key.Matches(msg, m.KeyMap.InputBegin):
-			m.moveToBegin()
+			m.MoveToBegin()
 		case key.Matches(msg, m.KeyMap.InputEnd):
-			m.moveToEnd()
+			m.MoveToEnd()
 		case key.Matches(msg, m.KeyMap.LowercaseWordForward):
 			m.lowercaseRight()
 		case key.Matches(msg, m.KeyMap.UppercaseWordForward):