pi-agent: Implement Help navigation consistency

internal/tui/presentation.go

@@ -68,6 +68,7 @@ type presentationState struct {
 	driftResolutionTargetID string
 	picker                  profilePickerState
 	form                    formState
+	help                    helpDialogState
 	confirmation            *app.Confirmation
 	confirmationDialog      *confirmationDialog
 	status                  string
@@ -122,11 +123,21 @@ func (p terminalPresentation) Render(state presentationState) string {
 		page = p.profilesView(state)
 	case formPage:
 		page = p.formView(state)
-	case helpPage:
-		page = p.helpView(state)
 	default:
 		page = p.mainView(state, width, height)
 	}
+	if state.help.top(state.confirmation) {
+		help := p.helpDialogView(state)
+		// Retain the underlying page header so Help is visibly contextual and
+		// modal rather than a replacement navigation destination.
+		page.primary = help.primary
+		page.context = ""
+		page.footer = help.footer
+		page.focusLine = help.focusLine
+		page.primaryOffset = help.primaryOffset
+		page.contextOffset = 0
+		page.dashboard = nil
+	}
 	page.status = renderStatus(state)
 	page.statusExpanded = state.errorExpanded && state.currentError != nil
 	page.statusOffset = state.errorOffset