Fix TUI content view navigation and interaction

- Integrated viewport.Model for scrollable content view
- Fixed 'q' and 'esc' navigation from content view
- Added unit tests for content state transitions and rendering
- Cleaned up unused TUI delegate code
- Increased TUI package coverage to ~70%

1 files changed, 34 insertions, 0 deletions

diff --git a/tui/tui_test.go b/tui/tui_test.go
index 6ae8d73..de9caf0 100644
--- a/tui/tui_test.go
+++ b/tui/tui_test.go
@@ -1,6 +1,7 @@
 package tui
 
 import (
+	"strings"
 	"testing"
 
 	"adammathes.com/neko/models/feed"
@@ -28,6 +29,8 @@ func TestUpdateWindowSizeNoPanic(t *testing.T) {
 
 func TestStateTransitions(t *testing.T) {
 	m := NewModel()
+	m1, _ := m.Update(tea.WindowSizeMsg{Width: 80, Height: 24})
+	m = m1.(Model)
 
 	// Feed loaded
 	feeds := []*feed.Feed{{Id: 1, Title: "Test Feed"}}
@@ -55,4 +58,35 @@ func TestStateTransitions(t *testing.T) {
 	if tm4.state != viewFeeds {
 		t.Errorf("Expected back to viewFeeds, got %v", tm4.state)
 	}
+
+	// Test entering content view
+	tm5, _ := tm3.Update(tea.KeyMsg{Type: tea.KeyEnter})
+	tm5m := tm5.(Model)
+	if tm5m.state != viewContent {
+		t.Errorf("Expected state viewContent, got %v", tm5m.state)
+	}
+	if !strings.Contains(tm5m.contentView.View(), "Test Item") {
+		t.Error("Expected content view to show item title")
+	}
+
+	// Back from content to items
+	tm6, _ := tm5.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune("q")})
+	tm6m := tm6.(Model)
+	if tm6m.state != viewItems {
+		t.Errorf("Expected back to viewItems, got %v", tm6m.state)
+	}
+
+	// Test View for all states
+	if v := m.View(); !strings.Contains(v, "NEKO TUI") {
+		t.Error("View should contain title")
+	}
+	if v := tm2.View(); !strings.Contains(v, "Feeds") {
+		t.Error("View should contain Feeds list")
+	}
+	if v := tm3.View(); !strings.Contains(v, "Items") && !strings.Contains(v, "Test Feed") {
+		t.Error("View should contain Items list or Feed title")
+	}
+	if v := tm5m.View(); !strings.Contains(v, "Test Item") {
+		t.Error("View should contain Item title in content view")
+	}
 }