Allow editing time entry start and end in TUI and web.

Duration is derived from the range so timer sessions can be corrected after the fact.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/ui/layout.go

@@ -60,9 +60,7 @@ func (m Model) renderBody(height int) string {
 		return lipgloss.NewStyle().Height(height).Width(m.width).Render(content)
 
 	case ModeTimeEdit:
-		prompt := m.styles.InputPrompt.Render("Edit duration:")
-		content := prompt + "\n" + m.input.View()
-		return lipgloss.NewStyle().Height(height).Width(m.width).Render(content)
+		return lipgloss.NewStyle().Height(height).Width(m.width).Render(m.timeEdit.View())
 
 	case ModeTimeEntries:
 		m.timeEntries.SetSize(m.width, height)