🎨 Palette: Fix screen reader announcement of flashcard hints

[lavkushry]

💡 What

Replaced CSS pseudo-elements (::before and ::after) used for flashcard visual hints with explicitly injected DOM elements (divs).

🎯 Why

CSS pseudo-elements cannot be hidden from screen readers using aria-hidden. Because of this, screen readers were reading out the visual tap hints and checkmarks along with the actual flashcard content (e.g. reading "tap to flip Right Arrow" alongside the question text), creating a noisy and confusing experience for users.

📸 Before/After

Visually, the UI looks identical. The classes and CSS rules have simply been shifted to target the newly injected .flashcard__hint and .flashcard__seen-mark DOM elements rather than the pseudo-selectors.

♿ Accessibility

• Explicitly injected div elements with aria-hidden="true".
• Silenced redundant announcements of decorative icons and state hints while preserving the core flashcard question and answer content for screen readers.

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PR created automatically by Jules for task 15726032428437788866 started by @lavkushry

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[gemini-code-assist]

Code Review

This pull request updates the flashcard component to improve accessibility for screen readers. It replaces CSS pseudo-elements that injected text (the checkmark and the "tap to flip" hint) with actual DOM elements configured with aria-hidden="true", and documents this best practice in the palette guide. The reviewer suggests using span instead of div for these new elements to ensure semantic correctness for inline text.

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[gemini-code-assist]

Using span instead of div is semantically more appropriate for inline text elements like the checkmark (✓) and the tap hint (tap to flip →). Since these elements represent short, inline textual/symbolic hints rather than structural block-level sections, span is the standard choice. This change is fully compatible with the existing CSS styles.

Suggested change

	const seenMark = document.createElement("div");
	seenMark.className = "flashcard__seen-mark";
	seenMark.setAttribute("aria-hidden", "true");
	seenMark.textContent = "✓";
	const hint = document.createElement("div");
	hint.className = "flashcard__hint";
	hint.setAttribute("aria-hidden", "true");
	hint.textContent = "tap to flip →";
	const seenMark = document.createElement("span");
	seenMark.className = "flashcard__seen-mark";
	seenMark.setAttribute("aria-hidden", "true");
	seenMark.textContent = "✓";
	const hint = document.createElement("span");
	hint.className = "flashcard__hint";
	hint.setAttribute("aria-hidden", "true");
	hint.textContent = "tap to flip →";