30 tests added for input_mapper and settings; 675 total pass

[MichaelFisher1997]

Tests added:

input_mapper_tests.zig (16 tests):

• InputBinding.getName for keys, key_alt, mouse buttons, none
• InputBinding.eql for .none, key vs key_alt, different types, none vs key
• ActionBinding.init / initWithAlt constructors
• InputMapper.init sets default bindings
• InputMapper.resetToDefaults restores all bindings
• InputMapper.setBinding / setAlternateBinding updates
• InputMapper.resetActionToDefault restores single action
• InputMapper.interface creates valid wrapper and getBinding

persistence_tests.zig (14 tests):

• setTexturePack returns early when same, changes value, handles multiple changes
• setEnvironmentMap returns early when same, changes value
• Settings.getShadowResolution for all quality levels and out-of-bounds clamp
• Settings.getResolutionIndex finds matching and defaults for unknown
• Settings.setResolutionByIndex updates and ignores invalid
• Settings default values
• SHADOW_QUALITIES array correctness
• RESOLUTIONS array coverage and roundtrip

All 675 tests pass (exit code 0).

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