🎨 Palette: Improve profile search clearing and icon accessibility

[yeboster]

💡 What:

1. Adds reactive else fallback to the domains list when the user clears the search field, reverting back to the full list of domains.
2. Fixes the isFuzzyMatch filter logic which previously returned undefined instead of false.
3. Conditionally renders the 'clear' trailing icon button in the Textfield, preventing users from focusing on an invisible/useless button when the search is empty.
4. Updates the icon aria-label from 'cancel' to 'clear search' for improved clarity.

🎯 Why:
Previously, clearing the search box did not clear the filtered search results, meaning users were stuck viewing their past search unless they refreshed the page. Additionally, an invisible "cancel" button was permanently focusable by screen readers, confusing keyboard users.

📸 Before/After:

• Before: Clearing search did nothing, cancel button focusable via Tab when empty.
• After: Clearing search resets list, button only focusable when active.

♿ Accessibility:

• Clear button removed from tab order when input is empty.
• More descriptive aria-label.

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PR created automatically by Jules for task 13186815215182520515 started by @yeboster

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