feat(mcp): align toolbar tab layout with Skills; frosted-glass tooltip

- MCP page toolbar: move Installed/Marketplace tabs to right side,
  matching the Skills page toolbar layout for consistency
- Tooltip: translucent themed background with backdrop-blur for
  frosted-glass appearance (affects chat sidebar icons, security
  popups, and all tooltip usages globally)

Worked with Interstellar Code

Author: Interstellar-code

src/components/ui/tooltip.tsx

@@ -38,11 +38,15 @@ function TooltipContent({
     <Tooltip.Portal>
       <Tooltip.Positioner side={side}>
         <Tooltip.Popup
-          className={cn('rounded-md px-2 py-1 text-xs shadow-sm', className)}
+          className={cn('rounded-md px-2 py-1 text-xs shadow-lg', className)}
           style={{
-            background: 'var(--theme-card)',
+            background:
+              'color-mix(in srgb, var(--theme-card) 80%, transparent)',
             color: 'var(--theme-text)',
-            border: '1px solid var(--theme-border)',
+            border:
+              '1px solid color-mix(in srgb, var(--theme-border) 70%, transparent)',
+            backdropFilter: 'blur(18px) saturate(140%)',
+            WebkitBackdropFilter: 'blur(18px) saturate(140%)',
           }}
         >
           {children}