fix(ui): restore tea.ClearScreen on tab switch to eliminate ghost text

internal/ui/snapshot_editor.go

@@ -114,14 +114,17 @@ func NewSnapshotEditor(snap *snapshot.Snapshot) SnapshotEditorModel {
 	}
 	tabs[3] = editorTab{name: "Taps", icon: "🔌", items: tapItems, itemType: editorItemTap}
 
-	prefItems := make([]editorItem, len(snap.MacOSPrefs))
-	for i, p := range snap.MacOSPrefs {
-		prefItems[i] = editorItem{
+	var prefItems []editorItem
+	for _, p := range snap.MacOSPrefs {
+		if p.Domain == "" || p.Key == "" {
+			continue
+		}
+		prefItems = append(prefItems, editorItem{
 			name:        fmt.Sprintf("%s.%s", p.Domain, p.Key),
 			description: fmt.Sprintf("= %s (%s)", p.Value, p.Desc),
 			selected:    true,
 			itemType:    editorItemMacOSPref,
-		}
+		})
 	}
 	tabs[4] = editorTab{name: "macOS Prefs", icon: "⚙️ ", items: prefItems, itemType: editorItemMacOSPref}
 
@@ -208,11 +211,13 @@ func (m SnapshotEditorModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) { //nolint
 			m.activeTab = (m.activeTab + 1) % len(m.tabs)
 			m.cursor = 0
 			m.scrollOffset = 0
+			return m, tea.ClearScreen
 
 		case key.Matches(msg, keys.ShiftTab), key.Matches(msg, keys.Left):
 			m.activeTab = (m.activeTab - 1 + len(m.tabs)) % len(m.tabs)
 			m.cursor = 0
 			m.scrollOffset = 0
+			return m, tea.ClearScreen
 
 		case key.Matches(msg, keys.Up):
 			if m.cursor > 0 {

internal/ui/snapshot_editor_test.go

@@ -68,6 +68,25 @@ func TestNewSnapshotEditorItems(t *testing.T) {
 	assert.Equal(t, "homebrew/core", m.tabs[3].items[0].name)
 }
 
+func TestNewSnapshotEditorSkipsInvalidMacOSPrefs(t *testing.T) {
+	snap := makeTestSnapshot()
+	snap.MacOSPrefs = append(snap.MacOSPrefs,
+		snapshot.MacOSPref{Domain: "cirruslabs/cli", Key: ""},                      // tap misclassified as pref
+		snapshot.MacOSPref{Domain: "", Key: "SomeKey"},                             // empty domain
+		snapshot.MacOSPref{Domain: "com.apple.dock", Key: "tilesize", Value: "48"}, // valid
+	)
+	m := NewSnapshotEditor(snap)
+
+	// Only valid prefs (non-empty domain AND key) should appear in the macOS Prefs tab.
+	prefTab := m.tabs[4]
+	for _, item := range prefTab.items {
+		assert.NotEmpty(t, item.name, "pref item name must not be empty")
+		assert.Contains(t, item.name, ".", "pref item name must contain a dot separator")
+	}
+	// 2 from makeTestSnapshot + 1 valid new pref = 3
+	assert.Equal(t, 3, len(prefTab.items))
+}
+
 func TestNewSnapshotEditorAllItemsSelected(t *testing.T) {
 	snap := makeTestSnapshot()
 	m := NewSnapshotEditor(snap)
@@ -751,6 +770,39 @@ func TestBuildEditedSnapshotAddedMacOSPrefSplitsOnLastDot(t *testing.T) {
 	assert.Equal(t, "48", added.Value)
 }
 
+func TestSnapshotEditorTabSwitchReturnsClearScreenCmd(t *testing.T) {
+	m := NewSnapshotEditor(makeTestSnapshot())
+
+	_, cmd := m.Update(tea.KeyMsg{Type: tea.KeyTab})
+	assert.NotNil(t, cmd, "Tab should return tea.ClearScreen cmd")
+
+	_, cmd = m.Update(tea.KeyMsg{Type: tea.KeyShiftTab})
+	assert.NotNil(t, cmd, "ShiftTab should return tea.ClearScreen cmd")
+}
+
+func TestSnapshotEditorViewTabIsolation(t *testing.T) {
+	snap := makeTestSnapshot()
+	snap.Packages.Taps = []string{"cirruslabs/cli", "hashicorp/tap"}
+	snap.MacOSPrefs = []snapshot.MacOSPref{
+		{Domain: "com.apple.dock", Key: "tilesize", Value: "48", Desc: "Dock tile size"},
+	}
+	m := NewSnapshotEditor(snap)
+	m.width = 80
+	m.height = 30
+
+	// macOS Prefs tab must not show any tap items
+	m.activeTab = 4
+	view := m.View()
+	assert.NotContains(t, view, "cirruslabs/cli", "tap item must not appear on macOS Prefs tab")
+	assert.Contains(t, view, "com.apple.dock.tilesize", "macOS pref must appear on macOS Prefs tab")
+
+	// Taps tab must not show any macOS pref items
+	m.activeTab = 3
+	view = m.View()
+	assert.Contains(t, view, "cirruslabs/cli", "tap must appear on Taps tab")
+	assert.NotContains(t, view, "com.apple.dock.tilesize", "macOS pref must not appear on Taps tab")
+}
+
 func TestSnapshotEditorAddedItemVisualBadge(t *testing.T) {
 	m := NewSnapshotEditor(makeTestSnapshot())
 	m.width = 80