Fix UI freeze: move cache loading and file hashing to background thread

Author: Offensive 360

src/main/kotlin/com/offensive360/sast/toolwindow/SecurityFindingsToolWindowFactory.kt

@@ -13,20 +13,25 @@ class SecurityFindingsToolWindowFactory : ToolWindowFactory {
         toolWindow.contentManager.addContent(content)
         SecurityFindingsService.getInstance(project).toolWindowPanel = panel
 
-        // Load cached scan results if available — but only if files haven't changed
+        // Load cached results on background thread to avoid freezing the UI
         val projectBasePath = project.basePath
         if (projectBasePath != null) {
-            val cached = ScanCache.load(projectBasePath)
-            if (cached != null && cached.findings.isNotEmpty()) {
-                // Recompute file hashes from the cached file paths and compare
-                val cachedFiles = cached.fileHashes.keys.map { java.io.File(it) }
-                val currentHashes = ScanCache.computeFileHashes(cachedFiles)
-                if (ScanCache.hasFilesChanged(currentHashes, cached.fileHashes)) {
-                    panel.setStatus("Code has changed since last scan. Run a new scan for updated results.")
-                } else {
-                    panel.showFindings(cached.findings)
-                    panel.setStatus("Showing ${cached.findings.size} cached finding${if (cached.findings.size != 1) "s" else ""} from previous scan")
-                }
+            com.intellij.openapi.application.ApplicationManager.getApplication().executeOnPooledThread {
+                try {
+                    val cached = ScanCache.load(projectBasePath)
+                    if (cached != null && cached.findings.isNotEmpty()) {
+                        val cachedFiles = cached.fileHashes.keys.map { java.io.File(it) }
+                        val currentHashes = ScanCache.computeFileHashes(cachedFiles)
+                        com.intellij.openapi.application.ApplicationManager.getApplication().invokeLater {
+                            if (ScanCache.hasFilesChanged(currentHashes, cached.fileHashes)) {
+                                panel.setStatus("Code has changed since last scan. Run a new scan for updated results.")
+                            } else {
+                                panel.showFindings(cached.findings)
+                                panel.setStatus("Showing ${cached.findings.size} cached finding${if (cached.findings.size != 1) "s" else ""} from previous scan")
+                            }
+                        }
+                    }
+                } catch (_: Exception) { }
             }
         }
     }