refactor(devti): improve code readability and accessibility

- Simplify FileSearchPopup.loadProjectFiles() by removing redundant Companion object call
- Make SimilarChunksWithPaths.getMostRecentFiles() public for wider usage

Author: phodal

core/src/main/kotlin/cc/unitmesh/devti/gui/chat/ui/FileSearchPopup.kt

@@ -43,7 +43,8 @@ class FileSearchPopup(
 
     private fun loadProjectFiles() {
         allProjectFiles.clear()
-        EditorHistoryManager.Companion.getInstance(project).fileList.forEach { file ->
+        val fileList = EditorHistoryManager.getInstance(project).fileList
+        fileList.forEach { file ->
             if (file.canBeAdded(project)) {
                 val presentation = FilePresentation.from(project, file)
                 presentation.isRecentFile = true

core/src/main/kotlin/cc/unitmesh/devti/inlay/chunks/SimilarChunksWithPaths.kt

@@ -132,7 +132,7 @@ class SimilarChunksWithPaths(private var snippetLength: Int = 60, private var ma
         }
     }
 
-    private fun getMostRecentFiles(element: PsiElement): List<VirtualFile> {
+    fun getMostRecentFiles(element: PsiElement): List<VirtualFile> {
         val fileType: FileType = element.containingFile?.fileType ?: return emptyList()
 
         val recentFiles: List<VirtualFile> = EditorHistoryManager.getInstance(element.project).fileList.filter { file ->