fix: DBTooltip race condition when component unmounts during delayed positioning

[Copilot]

The DBTooltip component was failing with a TypeError when the tooltip element was removed from the DOM during the 1ms delay used for positioning. This race condition occurred in automated tests and fast user interactions.

Problem

When a tooltip trigger is hovered, handleAutoPlacement is called with a 1ms delay to work around Angular-specific timing issues. However, if the component gets unmounted before this delay completes, the _ref becomes null, causing handleFixedPopover to fail:

TypeError: Failed to execute 'getComputedStyle' on 'Window': parameter 1 is not of type 'Element'

This typically happened in test scenarios where components were rapidly mounted and unmounted, but could also occur in real applications during fast user interactions.

Solution

Added a null check for _ref inside the delayed callback to prevent calling handleFixedPopover with a null reference:

utilsDelay(() => {
    if (_ref) {  // Added null check
        handleFixedPopover(_ref, parent, placement ?? 'bottom');
    }
}, 1);

Impact

• Minimal change: Only 2 lines added, no existing functionality modified
• Safe: Maintains all existing tooltip behavior while preventing crashes
• Complete coverage: Fix automatically applied to all framework outputs (React, Vue, Angular, Stencil)
• No performance impact: The null check is negligible overhead

The fix has been verified with manual testing showing tooltips continue to work correctly, and all existing tests pass.

Fixes #4400.

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