Floating Labels Margin Class Handling

Tests for margin class movement from .form-floating to wrapper.

Test 1: Basic Margins (mb-3, mt-2)

Expected: Margins moved from .form-floating to wrapper on init

Test 2: Destroy Restores Margins

Expected: Margins restored to .form-floating after destroy

Test 3: Margins with Vertical Buttons

Expected: Margins moved correctly with vertical button layout

Test 4: Advanced Mode (Input Group) with Margins

Expected: Margins moved to existing input-group wrapper

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