fix: resolve WebUI tooltips not rendering due to overflow clipping

Use position: fixed and getBoundingClientRect() to calculate tooltip
position dynamically. This prevents tooltips from being clipped by
parent containers with overflow: hidden (such as slide transitions).

Closes #1790

Signed-off-by: majiayu000 <majiayu000@users.noreply.github.com>

web/src/lib/components/ui/tooltip/Tooltip.svelte

@@ -3,9 +3,42 @@
   export let position: 'top' | 'bottom' | 'left' | 'right' = 'top';
 
   let tooltipVisible = false;
-  let tooltipElement: HTMLDivElement;
+  let triggerElement: HTMLDivElement;
+  let tooltipStyle = '';
+
+  function calculatePosition() {
+    if (!triggerElement) return;
+
+    const rect = triggerElement.getBoundingClientRect();
+    const gap = 8;
+
+    let top = 0;
+    let left = 0;
+
+    switch (position) {
+      case 'top':
+        top = rect.top - gap;
+        left = rect.left + rect.width / 2;
+        break;
+      case 'bottom':
+        top = rect.bottom + gap;
+        left = rect.left + rect.width / 2;
+        break;
+      case 'left':
+        top = rect.top + rect.height / 2;
+        left = rect.left - gap;
+        break;
+      case 'right':
+        top = rect.top + rect.height / 2;
+        left = rect.right + gap;
+        break;
+    }
+
+    tooltipStyle = `top: ${top}px; left: ${left}px;`;
+  }
 
   function showTooltip() {
+    calculatePosition();
     tooltipVisible = true;
   }
 
@@ -16,7 +49,8 @@
 
 <!-- svelte-ignore a11y-no-noninteractive-element-interactions a11y-mouse-events-have-key-events -->
 <div class="tooltip-container">
-  <div 
+  <div
+    bind:this={triggerElement}
     class="tooltip-trigger"
     on:mouseenter={showTooltip}
     on:mouseleave={hideTooltip}
@@ -27,15 +61,15 @@
   >
     <slot />
   </div>
-  
+
   {#if tooltipVisible}
     <div
-      bind:this={tooltipElement}
-      class="tooltip absolute z-[9999] px-2 py-1 text-xs rounded bg-gray-900/90 text-white whitespace-nowrap shadow-lg backdrop-blur-sm"
+      class="tooltip fixed z-[9999] px-2 py-1 text-xs rounded bg-gray-900/90 text-white whitespace-nowrap shadow-lg backdrop-blur-sm"
       class:top="{position === 'top'}"
       class:bottom="{position === 'bottom'}"
       class:left="{position === 'left'}"
       class:right="{position === 'right'}"
+      style={tooltipStyle}
       role="tooltip"
       aria-label={text}
     >
@@ -57,32 +91,24 @@
 
   .tooltip {
     pointer-events: none;
-    transition: all 150ms ease-in-out;
+    transition: opacity 150ms ease-in-out;
     opacity: 1;
   }
 
   .tooltip.top {
-    bottom: calc(100% + 5px);
-    left: 50%;
-    transform: translateX(-50%);
+    transform: translate(-50%, -100%);
   }
 
   .tooltip.bottom {
-    top: calc(100% + 5px);
-    left: 50%;
-    transform: translateX(-50%);
+    transform: translate(-50%, 0);
   }
 
   .tooltip.left {
-    right: calc(100% + 5px);
-    top: 50%;
-    transform: translateY(-50%);
+    transform: translate(-100%, -50%);
   }
 
   .tooltip.right {
-    left: calc(100% + 5px);
-    top: 50%;
-    transform: translateY(-50%);
+    transform: translate(0, -50%);
   }
 
   .tooltip-arrow {

web/src/lib/components/ui/tooltip/Tooltip.test.ts

@@ -0,0 +1,67 @@
+import { describe, it, expect } from 'vitest';
+
+describe('Tooltip positioning logic', () => {
+  const gap = 8;
+
+  function calculatePosition(
+    rect: { top: number; bottom: number; left: number; right: number; width: number; height: number },
+    position: 'top' | 'bottom' | 'left' | 'right'
+  ) {
+    let top = 0;
+    let left = 0;
+
+    switch (position) {
+      case 'top':
+        top = rect.top - gap;
+        left = rect.left + rect.width / 2;
+        break;
+      case 'bottom':
+        top = rect.bottom + gap;
+        left = rect.left + rect.width / 2;
+        break;
+      case 'left':
+        top = rect.top + rect.height / 2;
+        left = rect.left - gap;
+        break;
+      case 'right':
+        top = rect.top + rect.height / 2;
+        left = rect.right + gap;
+        break;
+    }
+
+    return { top, left };
+  }
+
+  const mockRect = {
+    top: 100,
+    bottom: 130,
+    left: 200,
+    right: 300,
+    width: 100,
+    height: 30
+  };
+
+  it('calculates top position correctly', () => {
+    const result = calculatePosition(mockRect, 'top');
+    expect(result.top).toBe(92); // 100 - 8
+    expect(result.left).toBe(250); // 200 + 100/2
+  });
+
+  it('calculates bottom position correctly', () => {
+    const result = calculatePosition(mockRect, 'bottom');
+    expect(result.top).toBe(138); // 130 + 8
+    expect(result.left).toBe(250); // 200 + 100/2
+  });
+
+  it('calculates left position correctly', () => {
+    const result = calculatePosition(mockRect, 'left');
+    expect(result.top).toBe(115); // 100 + 30/2
+    expect(result.left).toBe(192); // 200 - 8
+  });
+
+  it('calculates right position correctly', () => {
+    const result = calculatePosition(mockRect, 'right');
+    expect(result.top).toBe(115); // 100 + 30/2
+    expect(result.left).toBe(308); // 300 + 8
+  });
+});