🎨 Palette: Add contextual ARIA labels to workout exercise action buttons

[longestmt]

💡 What: Added dynamic, contextual aria-label attributes to the "History", "Swap exercise", "1RM Calculator", "Plates", and "Note" icon-only buttons in the active workout view (src/pages/workout.js). Additionally, added aria-hidden="true" to their internal <svg> elements.

🎯 Why: Icon-only buttons without accessible names cannot be understood by screen reader users. Adding dynamic ARIA labels specific to each exercise (e.g., "History for Barbell Back Squat" rather than just "History") ensures screen reader users can uniquely identify which exercise's history or settings they are interacting with when navigating the active workout page. Hiding the <svg> prevents screen readers from redundantly announcing the image element.

📸 Before/After: No visual changes were made.

♿ Accessibility: Significantly improves screen reader navigation and experience in the core workout interface by satisfying WCAG 4.1.2 Name, Role, Value.

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PR created automatically by Jules for task 7109295696396721783 started by @longestmt

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