🎨 Palette: Enhance Search UX and Fix Accessibility

[Woschj]

💡 What

This PR introduces micro-UX improvements to the Scandy search interface and fixes an accessibility regression in the base layout.

🎯 Why

• The previous search functionality lacked a quick way to reset the filter, requiring users to manually delete text.
• Users had no visual feedback when a search yielded zero results, which could be confusing.
• The QuickScan trigger used a mismatched div/button tag combination, which corrupted the accessibility tree.

♿ Accessibility

• Refactored quickScanTrigger to a semantic <button> element, which natively handles keyboard navigation and ARIA roles.
• Added descriptive aria-label and title attributes to the new "Clear Search" button.
• Used aria-live="polite" indirectly via the "No results" row to ensure screen readers are aware of empty states.

📸 UI Changes

• The search bar now uses the modern DaisyUI join component with integrated borders and focus rings.
• A "times-circle" icon appears inside the search input when text is entered, allowing for one-click clearing.
• A dedicated table row appears when no matching items are found, including a helpful "Suche zurücksetzen" (Reset search) link.

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PR created automatically by Jules for task 11731302769807672902 started by @Woschj

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