Fix ImGui Ctrl+Click functionality on Linux #2350
Merged
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Update mouse event handlers in CinderImGui to set modifier key states (KeyCtrl, KeyShift, KeyAlt, KeySuper) from MouseEvent. Previously these were only set during keyboard events, causing ImGui features like Ctrl+Click on sliders to not work reliably on Linux.
The fix ensures modifier states are synchronized with ImGui during all mouse events (MouseDown, MouseUp, MouseMove, MouseDrag, MouseWheel).