🎨 Palette: [Add aria-labels for accessibility]

[shadowcoder8]

💡 What: Added aria-label attributes to <input> and <select> elements across core HTML files based on their placeholder or ID values. Skipped <input type="hidden"> to prevent incorrect interpretation by screen readers.
🎯 Why: Forms in this application rely heavily on placeholder attributes rather than explicit, visible <label> elements. This breaks accessibility as screen readers cannot announce the inputs correctly without an aria-label.
📸 Before/After: N/A (Visuals are identical; changes are strictly in HTML attributes).
♿ Accessibility: Significant improvement for screen reader users by properly labeling inputs while preventing confusion caused by labeling hidden elements. Added relevant entry in .jules/palette.md.

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PR created automatically by Jules for task 1288875669047977617 started by @shadowcoder8

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