Improve settings navigation hover states and dark mode colors (#2419)
Fix invisible hover state on model list items in settings dark mode
The settings modal background is gray-800 in dark mode, so the
dark:hover:bg-gray-800/60 hover on model rows was invisible. Use
gray-700/50 instead, and add the missing hover state to the
Application Settings button.
Claude-Session: https://claude.ai/code/session_01VnSVoWnp6BH4L1P11ZjhGU
Co-authored-by: Claude <noreply@anthropic.com>