🎨 Palette: [UX improvement] Add missing form labels and aria-labels

[LebToki]

💡 What:
Added for attributes to form labels across studio.php and projects.php to link them to their respective inputs. Added aria-label attributes to standalone inputs (like the search box, terminal command box, and language selectors) in index.php and header.php.

🎯 Why:
This is a micro-UX and accessibility enhancement. By associating labels with inputs using the for attribute, users can click the label to focus the input field, which improves usability, especially for users with motor impairments. Adding aria-labels to inputs that lack a visible label ensures that screen readers can correctly identify the purpose of the input to visually impaired users.

♿ Accessibility:
Improves screen reader compatibility and keyboard navigation by ensuring all form controls are properly labelled and focusable via their visible text labels.

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PR created automatically by Jules for task 14035286763420497495 started by @LebToki

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