fix: replace custom tooltip with shadcn/ui Radix tooltip

Replaced the glass/blur-styled tooltip with the standard shadcn/ui
pattern: bg-foreground/text-background, arrow pointer, proper
slide/fade animations, and w-fit max-w-xs sizing. This gives all
tooltips a consistent dark-solid look across the entire app.

frontend/src/components/ui/tooltip.tsx

@@ -1,36 +1,56 @@
-'use client';
+"use client"
 
-import * as React from 'react';
-import * as TooltipPrimitive from '@radix-ui/react-tooltip';
-import { cn } from '@/lib/utils';
+import * as React from "react"
+import * as TooltipPrimitive from "@radix-ui/react-tooltip"
+import { cn } from "@/lib/utils"
 
-// Use Radix primitives directly to avoid animate-ui context dependencies
-// that can cause crashes in certain component tree configurations.
-const TooltipProvider = TooltipPrimitive.Provider;
-const Tooltip = TooltipPrimitive.Root;
-const TooltipTrigger = TooltipPrimitive.Trigger;
-
-const TooltipContent = React.forwardRef<
-  HTMLDivElement,
-  React.ComponentProps<typeof TooltipPrimitive.Content>
->(({ className, sideOffset = 4, ...props }, ref) => (
-  <TooltipPrimitive.Portal>
-    <TooltipPrimitive.Content
-      ref={ref}
-      sideOffset={sideOffset}
-      className={cn(
-        'z-50 overflow-hidden rounded-md border border-glass-border bg-popover px-3 py-1.5 font-mono text-xs tabular-nums text-stat-value backdrop-blur-[10px] backdrop-saturate-[1.15]',
-        'origin-[--radix-tooltip-content-transform-origin]',
-        'animate-in fade-in-0 zoom-in-95 duration-150',
-        'data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95',
-        'data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2',
-        'data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2',
-        className
-      )}
+function TooltipProvider({
+  delayDuration = 0,
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Provider>) {
+  return (
+    <TooltipPrimitive.Provider
+      data-slot="tooltip-provider"
+      delayDuration={delayDuration}
       {...props}
     />
-  </TooltipPrimitive.Portal>
-));
-TooltipContent.displayName = 'TooltipContent';
+  )
+}
 
-export { Tooltip, TooltipTrigger, TooltipContent, TooltipProvider };
+function Tooltip({
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Root>) {
+  return <TooltipPrimitive.Root data-slot="tooltip" {...props} />
+}
+
+function TooltipTrigger({
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Trigger>) {
+  return <TooltipPrimitive.Trigger data-slot="tooltip-trigger" {...props} />
+}
+
+function TooltipContent({
+  className,
+  sideOffset = 0,
+  children,
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Content>) {
+  return (
+    <TooltipPrimitive.Portal>
+      <TooltipPrimitive.Content
+        data-slot="tooltip-content"
+        sideOffset={sideOffset}
+        className={cn(
+          "z-50 inline-flex w-fit max-w-xs origin-(--radix-tooltip-content-transform-origin) items-center gap-1.5 rounded-md bg-foreground px-3 py-1.5 text-xs text-background has-data-[slot=kbd]:pr-1.5 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 data-[state=delayed-open]:animate-in data-[state=delayed-open]:fade-in-0 data-[state=delayed-open]:zoom-in-95 data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95",
+          className
+        )}
+        {...props}
+      >
+        {children}
+        <TooltipPrimitive.Arrow className="z-50 size-2.5 translate-y-[calc(-50%_-_2px)] rotate-45 rounded-[2px] bg-foreground fill-foreground" />
+      </TooltipPrimitive.Content>
+    </TooltipPrimitive.Portal>
+  )
+}
+
+export { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger }