🎨 Palette: Convert flashcard CSS hints to ARIA-hidden DOM elements

[lavkushry]

💡 What:
Removed textual hints ("tap to flip →") and seen checkmarks ("✓") that were being injected via CSS pseudo-elements (::before/::after) on flashcards. Replaced them with actual DOM elements that include aria-hidden="true" attributes.

🎯 Why:
Screen readers cannot naturally ignore text injected via CSS content: properties, leading to redundant and confusing announcements for screen reader users (e.g., repeating "tap to flip" indiscriminately). By using actual DOM elements with aria-hidden, the visual UI remains exactly the same while completely silencing the noise for assistive technologies.

📸 Before/After:
The visual layout is unchanged (verified via automated visual regression and manual screenshot generation), but the underlying accessible DOM tree is cleaner.

♿ Accessibility:
Improves screen reader clarity by hiding decorative visual cues that otherwise clutter announcements. Added an entry to .jules/palette.md to document this critical CSS accessibility learning for future reference.

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PR created automatically by Jules for task 14783451160313123447 started by @lavkushry

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[gemini-code-assist]

Code Review

This pull request addresses accessibility issues where screen readers redundantly announce text injected via CSS pseudo-elements. The changes replace CSS pseudo-elements (::before and ::after) on flashcards with actual DOM elements (.flashcard__hint and .flashcard__seen-mark) that are explicitly hidden from screen readers using aria-hidden="true". A corresponding entry has also been added to the palette documentation. There are no review comments, and I have no additional feedback to provide.

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