🎨 Palette: Improve screen reader accessibility for workout action buttons

[longestmt]

💡 What: Added highly descriptive aria-label attributes to the icon-only action buttons (History, Swap, 1RM Calculator, Plates, Note) and ambiguously named set modification buttons ("+ Set", "− Set") within the workout exercise cards. We now interpolate the specific exercise name (e.g. aria-label="History for Bench Press"). Additionally, added aria-hidden="true" to the inner decorative <svg> elements.

🎯 Why: Screen reader users navigating a list of exercise cards were previously hearing a repetitive sequence of identical generic buttons like "History button, Swap exercise button". Providing explicit item context allows them to confidently know which exercise they are operating on.

📸 Before/After: Visual appearance remains exactly the same.

♿ Accessibility: Massively improves navigation predictability for screen reader users by removing contextless generic action labels on repeated list elements, and correctly hides decorative graphical SVGs.

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PR created automatically by Jules for task 16443674044900694375 started by @longestmt

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