fix: arrow keys on variable selection

internal/ui/var_resolve.go

@@ -351,6 +351,11 @@ func (m *mainModel) handleVarResolveKey(msg tea.KeyMsg) tea.Cmd {
 		return nil
 	case "enter":
 		return m.acceptVarValue()
+	case "up", "ctrl+p", "down", "ctrl+n", "pgup", "pgdown":
+		if !m.varState.isPromptOnly && m.varState.picker != nil {
+			m.varState.picker.HandleKey(msg)
+		}
+		return nil
 	case "tab":
 		if m.completePathFromInput() {
 			return nil

internal/ui/var_resolve_test.go

@@ -0,0 +1,36 @@
+package ui
+
+import (
+	"testing"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/gubarz/cheatmd/pkg/parser"
+)
+
+func TestVarResolveArrowKeysMoveSelection(t *testing.T) {
+	m := newMainModel([]*parser.Cheat{{Header: "One"}}, parser.NewCheatIndex(), nil)
+	items := []FilteredOption{
+		{Display: "alpha", Original: "alpha", SearchText: "alpha"},
+		{Display: "beta", Original: "beta", SearchText: "beta"},
+		{Display: "gamma", Original: "gamma", SearchText: "gamma"},
+	}
+	m.phase = phaseVarResolve
+	m.varState = &varResolveState{
+		isPromptOnly: false,
+		picker: NewPicker(items, func(opt FilteredOption, words []string) bool {
+			return matchesAllWords(opt.SearchText, words)
+		}),
+	}
+
+	model, _ := m.updateVarResolve(tea.KeyMsg{Type: tea.KeyDown})
+	got := model.(*mainModel)
+	if got.varState.picker.Cursor != 1 {
+		t.Fatalf("cursor after down = %d, want 1", got.varState.picker.Cursor)
+	}
+
+	model, _ = got.updateVarResolve(tea.KeyMsg{Type: tea.KeyUp})
+	got = model.(*mainModel)
+	if got.varState.picker.Cursor != 0 {
+		t.Fatalf("cursor after up = %d, want 0", got.varState.picker.Cursor)
+	}
+}