Add support for both responsive and fixed column layouts in MgGridInfoPanel via new parameters (TwoColumnBreakpoint, ThreeColumnBreakpoint, FourColumnBreakpoint, FixedColumnCount). Refactor CSS to use variables for breakpoints, add fixed column classes, and update container queries. Move styles to a new global mg-grid-info-panel.css, referenced in App.razor and index.html. Improve view mode styling and accessibility. Add Partner.Country column to GridPartner.razor.
Loretta
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