fix: enable scrolling in help screen viewport

- Fixed viewport update handling in main Update function
- Viewport now properly receives mouse and scroll events
- Content is set immediately when help is toggled
- Resolves issue where help screen couldn't scroll on small terminals

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

2 files changed, 8 insertions, 3 deletions

diff --git a/internal/ui/keyhandlers.go b/internal/ui/keyhandlers.go
index 428f28e..419bc14 100644
--- a/internal/ui/keyhandlers.go
+++ b/internal/ui/keyhandlers.go
@@ -121,7 +121,9 @@ func (m *Model) handleToggleHelp() (tea.Model, tea.Cmd) {
 		height = 20 // Default height
 	}
 	m.helpViewport = viewport.New(width, height)
-	m.helpViewport.SetContent("") // Content will be set in renderHelpScreen
+	// Set the content immediately
+	content := m.buildHelpContent()
+	m.helpViewport.SetContent(content)
 	return m, nil
 }
 
diff --git a/internal/ui/table.go b/internal/ui/table.go
index a0a82c5..a430dcf 100644
--- a/internal/ui/table.go
+++ b/internal/ui/table.go
@@ -420,9 +420,12 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		return m.handleNormalMode(msg)
 	}
 	
-	// Default case - pass through to table
+	// Default case - pass through to appropriate component
 	if m.showHelp {
-		return m, nil
+		// Update help viewport for mouse wheel and other events
+		var cmd tea.Cmd
+		m.helpViewport, cmd = m.helpViewport.Update(msg)
+		return m, cmd
 	}
 	
 	var cmd tea.Cmd