drm: check syncobj timeline support before advertising protocol (#11117)

Prevents crashes on systems where DRM driver lacks syncobj timeline
support (e.g., Apple Silicon with Honeykrisp driver). Applications
like Zed and WezTerm would crash with 'Timeline failed importing'
when trying to use explicit sync.

Fixes #8158 #8803

---------

Co-authored-by: mvonarx <matthias.vonarx@sitrox.com>

src/Compositor.hpp

@@ -152,6 +152,7 @@ class CCompositor {
     NColorManagement::SImageDescription getPreferredImageDescription();
     bool                                shouldChangePreferredImageDescription();
 
+    bool                                supportsDrmSyncobjTimeline() const;
     std::string                         m_explicitConfigPath;
 
   private:
@@ -165,6 +166,8 @@ class CCompositor {
     void             removeLockFile();
     void             setMallocThreshold();
 
+    bool             m_bDrmSyncobjTimelineSupported = false;
+
     uint64_t         m_hyprlandPID    = 0;
     wl_event_source* m_critSigSource  = nullptr;
     rlimit           m_originalNofile = {};