Integrate backend APIs and move review to center editor tab

src/core/FileSaveService.js

@@ -37,6 +37,45 @@ export class FileSaveService {
     return { mode: "download", path: normalizedPath };
   }
 
+  async saveExistingFile(projectStore, path, content) {
+    const normalizedPath = PathUtils.normalizeRelative(path);
+    if (projectStore.rootHandle) {
+      await this.#writeWithRootHandle(projectStore.rootHandle, normalizedPath, content);
+      return { mode: "inplace", path: normalizedPath };
+    }
+
+    const knownHandle = projectStore.fileHandles.get(normalizedPath) || this.fallbackHandles.get(normalizedPath);
+    if (knownHandle && typeof knownHandle.createWritable === "function") {
+      await this.#writeWithFileHandle(knownHandle, content);
+      return { mode: "inplace", path: normalizedPath };
+    }
+
+    throw new Error("Нет доступа к существующему файлу для записи без выбора новой директории.");
+  }
+
+  async saveNewFileWithPicker(projectStore, suggestedPath, content) {
+    if (typeof window.showSaveFilePicker !== "function") {
+      throw new Error("showSaveFilePicker is not supported");
+    }
+    const normalizedPath = PathUtils.normalizeRelative(suggestedPath);
+    const pickerOptions = {
+      suggestedName: PathUtils.basename(normalizedPath),
+      id: this.#buildProjectSaveId(projectStore)
+    };
+    if (projectStore.rootHandle) pickerOptions.startIn = projectStore.rootHandle;
+
+    const handle = await window.showSaveFilePicker(pickerOptions);
+    await this.#writeWithFileHandle(handle, content);
+
+    const resolvedPath = await this.#resolveRelativePath(projectStore.rootHandle, handle);
+    if (!resolvedPath) {
+      throw new Error("Выберите путь внутри директории проекта.");
+    }
+
+    this.fallbackHandles.set(resolvedPath, handle);
+    return { mode: "save_as", path: resolvedPath };
+  }
+
   async deleteFile(projectStore, path) {
     const normalizedPath = PathUtils.normalizeRelative(path);
     if (!projectStore.rootHandle) return false;
@@ -89,4 +128,11 @@ export class FileSaveService {
     const normalized = projectName.toLowerCase().replaceAll(/[^a-z0-9_-]/g, "-").replaceAll(/-+/g, "-");
     return `save-${normalized || "project"}`;
   }
+
+  async #resolveRelativePath(rootHandle, fileHandle) {
+    if (!rootHandle || typeof rootHandle.resolve !== "function") return fileHandle?.name || "";
+    const parts = await rootHandle.resolve(fileHandle);
+    if (!Array.isArray(parts) || !parts.length) return "";
+    return PathUtils.normalizeRelative(parts.join("/"));
+  }
 }