feat: 添加数据集创建功能，支持保存元数据到文件

src/routes/create/+page.svelte

@@ -1,8 +1,12 @@
 <script lang="ts">
-import { afterNavigate } from '$app/navigation';
+import { afterNavigate, goto } from '$app/navigation';
+import { openedDatasetDir } from '$lib/stores/dataset';
 import { currentActivate } from '$lib/stores/navigate';
+import type { DatasetMeta } from '$lib/types/meta';
+import { join } from '@tauri-apps/api/path';
 import { message, open } from '@tauri-apps/plugin-dialog';
-import { readDir } from '@tauri-apps/plugin-fs';
+import { readDir, writeTextFile } from '@tauri-apps/plugin-fs';
+import { isNil } from 'es-toolkit';
 
 afterNavigate(() => {
   currentActivate.set('dataset');
@@ -45,6 +49,41 @@ async function selectStorePath() {
     console.error('Failed to select store path:', error);
   }
 }
+
+async function createDataset() {
+  if (!isNil(storePath) && !isNil(datasetName) && storePath.trim() && datasetName.trim()) {
+    const datasetMeta: DatasetMeta = {
+      name: datasetName.trim(),
+      targetModel: '',
+      loraType: '',
+      unifiedImageSize: true,
+      unifiedImageRatio: true,
+      imageSize: [512, 512],
+      triggerWords: [],
+    };
+
+    try {
+      const metaPath = await join(storePath, 'meta.json');
+      await writeTextFile(metaPath, JSON.stringify(datasetMeta, null, 2));
+
+      localStorage.setItem('#sym:openedDatasetDir', storePath);
+      openedDatasetDir.set(storePath);
+
+      await goto('/dataset');
+    } catch (error) {
+      console.error('Failed to create dataset:', error);
+      await message('Failed to create dataset. Please check permissions and try again.', {
+        kind: 'error',
+        title: 'Create Dataset Failed',
+      });
+    }
+  } else {
+    await message('Store path and dataset name are required.', {
+      kind: 'warning',
+      title: 'Missing Required Fields',
+    });
+  }
+}
 </script>
 
 <main class="flex flex-col gap-2 p-4 self-center">
@@ -60,5 +99,5 @@ async function selectStorePath() {
     <span class="label min-w-[10em]">Dataset Name</span>
     <input type="text" class="min-w-[20em]" bind:value={datasetName} />
   </label>
-  <button class="btn btn-primary btn-md w-fit self-center">Create</button>
+  <button class="btn btn-primary btn-md w-fit self-center" onclick={createDataset}>Create</button>
 </main>