- Add new settings for shader building overlay and performance graph
- Create ShaderBuildingOverlayView with animated shader building indicator
- Implement JNI bridge to get shader building count from core
- Add performance metrics display (FPS, frametime, emulation speed)
- Include real-time frametime graph with min/avg/max statistics
- Add menu options to toggle overlay and graph independently
- Integrate with existing overlay system in EmulationFragment
- Optimize Vulkan pipeline cache loading with pre-reservation
- Improve async shader building to reduce main thread blocking
Signed-off-by: Zephyron <zephyron@citron-emu.org>