Fix missing overall feedback and score bar on result screen

[tammets]

Summary

• Result screen stopped rendering the Overall Feedback text and the score bar after the H5P.Components.ResultScreen refactor (VA-460, 2c3e287).
• The refactor removed the .feedback-section / .feedback-scorebar / .feedback-text wrapper, but _displayEndGame still tries to fill those selectors via jQuery — both matched zero elements, so the computed scoreString and score bar were silently dropped.
• This PR re-adds the wrapper inside the result page so the existing append logic has real targets again. No other code paths or styles change.

Fixes #183

Test plan

• Create a Question Set with 2+ questions and configure Overall Feedback ranges (e.g. 0–49% "Try again", 50–100% "Well done").
• Leave Display results enabled, complete the quiz, confirm score bar and matching overall feedback text appear on the result screen.
• Turn Display results off, confirm feedback section and buttons are hidden (the existing else branch at js/questionset.js:748 now actually removes .feedback-section).
• Per-question list, headers and score summary still render as before.

[Copilot]

Pull request overview

Reintroduces the missing result-screen DOM wrapper needed by legacy jQuery append logic so the Overall Feedback text and score bar render again on the Question Set end screen after the H5P.Components.ResultScreen refactor.

Changes:

• Add back the .feedback-section container with .feedback-scorebar and .feedback-text inside the result page markup.

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[Copilot]

self.$feedbackSection is assigned here but never read anywhere else in the file. Consider not storing this on self (just append the wrapper), or store it in a local variable if you need it later; otherwise it looks like leftover state and can confuse future maintenance. Also, to match surrounding code (e.g. self.$resultPage, self.$buttonsContainer), consider building the wrapper via $("<div>", { class: ... }) rather than concatenating an HTML string.

Suggested change

	self.$feedbackSection = $(
	'<div class="feedback-section">' +
	'<div class="feedback-scorebar"></div>' +
	'<div class="feedback-text"></div>' +
	'</div>'
	).appendTo(self.$resultPage);
	$('<div>', {
	class: 'feedback-section',
	append: [
	$('<div>', { class: 'feedback-scorebar' }),
	$('<div>', { class: 'feedback-text' })
	],
	appendTo: self.$resultPage
	});