fix(grid): force top row offset for RowDetail in transform mode

[ghiscoding]

Description

This change makes RowDetail rendering safer by automatically switching row offset rendering to top when transform is configured. The goal is to prevent known visual issues while keeping behavior stable and minimal.

High-level updates:

1. Keep RowSpan warning behavior in init.
2. Enforce RowDetail fallback from transform to top during option validation.
3. Remove duplicate warning noise from the new fallback path.
4. Update and align unit tests with the final behavior.

Validation:

1. Targeted core SlickGrid specs pass.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (144cc05) to head (4c9e000).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2722   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         200      200           
  Lines       25542    25544    +2     
  Branches     9030     9031    +1     
=======================================
+ Hits        25542    25544    +2     

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

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commit: 4c9e000