🎨 Palette: Micro-UX and Accessibility Improvements

[Woschj]

This PR implements a set of micro-UX and accessibility improvements across key application templates.

💡 What:

• Updated app/templates/shared/list_base.html: Added aria-label to the search input and button. Converted the legacy input-group to the modern DaisyUI join component.
• Updated app/templates/auth/login.html: Added id and for attributes to form fields to ensure proper semantic binding for screen readers and improved click targets.
• Updated app/templates/components/quickscan_modal.html: Added keyboard navigation support to the selection cards using role="button", tabindex="0", and onkeydown handlers. Added aria-label to the modal close button and selection cards.

🎯 Why:
To ensure the application is more accessible to users with screen readers and those who rely on keyboard navigation, and to modernize some of the UI components.

♿ Accessibility:

• Every form field in the modified templates now has a programmatically associated label.
• Icon-only buttons and inputs now have descriptive ARIA labels.
• Decorative icons are hidden from assistive technologies.
• Custom interactive elements (cards) are now fully keyboard-accessible.

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PR created automatically by Jules for task 14421653745360550204 started by @Woschj

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