What changed

• Profile creation screen is redesigned with elevated card sections, each with an icon and title header.
• Each configuration key card shows a disabled status chip ("Configured" or "Not set") so users can see completion at a glance.
• The signal quality slider now shows "Off" and "Strict" range labels at the ends and clamps out-of-range values.
• The model dropdown shows the selected model's icon as a leading indicator.
• Invalid key input is now properly cleared instead of silently kept.

Technical Context

• Sections are extracted into a reusable ProfileSectionCard wrapper (icon + title + divider) to reduce duplication.
• Replaced flat Card with ElevatedCard for visual consistency with other redesigned screens.
• The slider clamp and onKeyChange(null) for invalid input fix edge cases where stale or malformed values could persist in the ViewModel.
• Added a third Compose preview for development iteration.