Derive mixed precision from settings object to prevent propagation bugs

[Copilot]

The curvature_matrix_via_mapping_matrix_from function accepted both a settings parameter and a separate use_mixed_precision flag, making it easy for call sites to pass settings but forget the flag, silently disabling mixed precision.

Changes

• Removed redundant use_mixed_precision parameter from curvature_matrix_via_mapping_matrix_from
• Function now reads settings.use_mixed_precision directly
• Updated imaging/mapping.py to remove explicit use_mixed_precision argument
• Updated interferometer/mapping.py to pass settings parameter (was missing, defaulting to use_mixed_precision=False)

Example

Before:

curvature_matrix = curvature_matrix_via_mapping_matrix_from(
    mapping_matrix=matrix,
    noise_map=noise,
    settings=settings,
    use_mixed_precision=settings.use_mixed_precision,  # Redundant, easy to forget
    xp=xp,
)

After:

curvature_matrix = curvature_matrix_via_mapping_matrix_from(
    mapping_matrix=matrix,
    noise_map=noise,
    settings=settings,  # Mixed precision derived automatically
    xp=xp,
)

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