add tsf availability check

src-tauri/src/tsf_availability.rs

@@ -0,0 +1,24 @@
+use anyhow::Result;
+use tracing::{error, info};
+
+use crate::tsf::{search_candidate_provider::SearchCandidateProvider, set_thread_local_input_settings};
+
+pub fn check_tsf_availability() -> Result<bool> {
+    info!("Checking TSF availability");
+
+    if let Err(e) = set_thread_local_input_settings(true) {
+        error!("Failed to set thread local input settings: {:?}", e);
+        return Ok(false);
+    }
+
+    match SearchCandidateProvider::create() {
+        Ok(_) => {
+            info!("TSF is available");
+            Ok(true)
+        }
+        Err(e) => {
+            error!("Failed to create SearchCandidateProvider: {:?}", e);
+            Ok(false)
+        }
+    }
+}