fix: save/restore user clipboard around injection

- read_clipboard() saves current content before Vietnamese injection
- Restores after paste so user's Ctrl+C copy isn't overwritten
- Fixes Ctrl+C/V conflict with daemon's clipboard injection

protocol/src/uinput_monitor.rs

@@ -361,14 +361,18 @@ impl UinputInjector {
             return InjectResult::Success;
         }
 
-        // Unicode: clipboard paste. Backspaces FIRST, then paste everything at once.
+        // Unicode: clipboard paste. Save user clipboard first, restore after.
+        let saved = self.read_clipboard();
         if backspaces > 0 {
             for _ in 0..backspaces { let _ = self.send_backspace(); }
         }
-
         if self.copy_to_clipboard(text) {
             self.send_ctrl_v_x11();
         }
+        // Restore user's clipboard
+        if let Some(prev) = saved {
+            self.copy_to_clipboard(&prev);
+        }
 
         InjectResult::Success
     }
@@ -449,6 +453,19 @@ impl UinputInjector {
     }
 
     /// Copy text to clipboard using wl-copy (Wayland) or xclip (X11).
+    fn read_clipboard(&self) -> Option<String> {
+        // Read clipboard via xclip to restore after injection
+        let output = std::process::Command::new("xclip")
+            .args(["-selection", "clipboard", "-o"])
+            .output()
+            .ok()?;
+        if output.status.success() {
+            String::from_utf8(output.stdout).ok()
+        } else {
+            None
+        }
+    }
+
     fn copy_to_clipboard(&self, s: &str) -> bool {
         // Try wl-copy (Wayland) via user_cmd
         {