feat: Improve FSR2 UI with dropdown quality mode and conditional FSR sharpness

- Convert FSR2 quality mode from number input to dropdown with 4 options
- Disable and grey out FSR sharpness slider when FSR2 is selected
- Add proper enum-based settings for FSR2 quality modes
- Update both Vulkan and OpenGL FSR2 implementations
- Connect UI state changes automatically

Provides better UX by using appropriate controls and preventing confusion
between FSR 1.0 and FSR 2.0 sharpening options.

Signed-off-by: Zephyron <zephyron@citron-emu.org>

src/citron/configuration/shared_translation.cpp

@@ -404,6 +404,13 @@ std::unique_ptr<ComboboxTranslationMap> ComboboxEnumeration(QWidget* parent) {
                               PAIR(AntiAliasing, Fxaa, tr("FXAA")),
                               PAIR(AntiAliasing, Smaa, tr("SMAA")),
                           }});
+    translations->insert({Settings::EnumMetadata<Settings::FSR2QualityMode>::Index(),
+                          {
+                              PAIR(FSR2QualityMode, Quality, tr("Quality")),
+                              PAIR(FSR2QualityMode, Balanced, tr("Balanced")),
+                              PAIR(FSR2QualityMode, Performance, tr("Performance")),
+                              PAIR(FSR2QualityMode, UltraPerformance, tr("Ultra Performance")),
+                          }});
     translations->insert({Settings::EnumMetadata<Settings::AspectRatio>::Index(),
                           {
                               PAIR(AspectRatio, R16_9, tr("Default (16:9)")),