fix(slickgrid): prevent native wheel drift with frozen columns

[ghiscoding]

Summary

Fix wheel-scroll drift when using frozen columns.

When SlickGrid handles a wheel event, it updates the scrolling viewport and mirrors the vertical position to the frozen-column pane. The browser could then apply its native wheel scroll as well, briefly advancing the main viewport ahead of the frozen pane.

Changes

• Prevent the native wheel default only after SlickGrid has handled the event and frozen columns are enabled.
• Keep existing event propagation behavior.
• Leave regular, non-frozen grid scrolling unchanged.

Test Coverage

• Updated the frozen columns/rows mousewheel regression test to verify that the handled wheel event calls preventDefault().
• slickGrid.spec.ts: 428 tests passing.

Scope

This fixes wheel and touchpad scrolling handled by SlickGrid. Native scrollbar-thumb dragging remains unchanged.

LLM model attribution

This PR was assisted by Codex GPT-5.6-Terra.

bug demo

Screencast_20260817_193846.webm

with fix

Screencast_20260817_193728.webm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (75d6a2e) to head (c88e6ce).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2737   +/-   ##
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  Coverage   100.0%   100.0%           
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  Files         200      200           
  Lines       25569    25571    +2     
  Branches     9037     9038    +1     
=======================================
+ Hits        25569    25571    +2     

Flag	Coverage Δ
angular	100.0% <ø> (ø)
universal	100.0% <100.0%> (ø)

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commit: c88e6ce