Reduce idle CPU use and prioritize compositor rendering (#62)

Avoid background title updates when no shell window list is visible, and skip output and capture invalidation for titles outside compositor decorations. Preserve focused titles, fresh window lists and capture privacy.

Request high EGL context priority with fallback, cover rendering and native title behavior in CI, and keep audio recording flowing while video capture is idle.

protocols/ferese-shell-v1.xml

@@ -22,7 +22,7 @@
     DEALINGS IN THE SOFTWARE.
   </copyright>
 
-  <interface name="ferese_shell_manager_v1" version="10">
+  <interface name="ferese_shell_manager_v1" version="11">
     <description summary="create a capability-scoped Ferese shell controller">
       This private global is visible only to clients granted the shell-control
       capability. It does not assign a Wayland surface role.
@@ -35,7 +35,7 @@
     <request name="destroy" type="destructor"/>
   </interface>
 
-  <interface name="ferese_shell_v1" version="10">
+  <interface name="ferese_shell_v1" version="11">
     <description summary="managed-window metadata and shell control">
       Window, workspace, and output identifiers are unsigned 64-bit values
       encoded as high and low 32-bit words. Each snapshot atomically replaces
@@ -244,5 +244,17 @@
     <event name="dismiss_launcher" since="10">
       <description summary="discard launcher state before locking"/>
     </event>
+    <request name="set_background_title_updates" since="11">
+      <description summary="watch titles used by window lists">
+        When enabled is zero, changes to unfocused window titles alone do not
+        trigger snapshots. Focused titles and all other window metadata still
+        trigger updates. Snapshots always contain the current titles of every
+        window, and changing this preference sends a fresh snapshot immediately
+        while the session is unlocked.
+        Updates are enabled initially. Disable them while no window list is
+        visible to avoid repainting the panel for background title animations.
+      </description>
+      <arg name="enabled" type="uint"/>
+    </request>
   </interface>
 </protocol>