feat(visualization): remove display quality setting, always render best (#4490)

* feat(visualization): remove display quality setting, always render best

The Low/Medium/High/Best display quality selection in the global
configuration dialog is removed. The map is now always rendered at the
former "Best" quality: hardware antialiasing plus native device pixel
ratio. The FXAA post-processing pipeline (CustomComposer, fxaa shaders)
that only served the Medium mode is removed along with the SharpnessMode
state slice, the renderer restart on quality changes, and the unused
ThreeViewerService.restart().

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(visualization): mark globalSettingsFacade as readonly

Resolves Sonar issue S2933 on the renderer service constructor.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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Co-authored-by: Christian Hühn <christian.huehn@maibornwolff.de>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>