feat: 添加数据集加载功能，支持从文件读取元数据和图像元数据

src/lib/stores/dataset.ts

@@ -1,3 +1,8 @@
+import type { DatasetMeta, ImageMeta } from "$lib/types/meta";
 import { writable } from "svelte/store";
 
 export const openedDatasetDir = writable<string | null>(null);
+
+export const activeDatasetMeta = writable<DatasetMeta | null>(null);
+
+export const activeDatasetImageMetas = writable<ImageMeta[]>([]);

src/routes/dataset/+page.ts

@@ -0,0 +1,53 @@
+import { goto } from '$app/navigation';
+import { activeDatasetImageMetas, activeDatasetMeta, openedDatasetDir } from '$lib/stores/dataset';
+import { isDatasetMeta, type ImageMeta } from '$lib/types/meta';
+import { join } from '@tauri-apps/api/path';
+import { readDir, readTextFile } from '@tauri-apps/plugin-fs';
+import { isNil } from 'es-toolkit';
+import { get } from 'svelte/store';
+import type { PageLoad } from './$types';
+
+export const load = (async () => {
+  const activeDataset = get(openedDatasetDir);
+
+  if (isNil(activeDataset)) {
+    await goto('/boot');
+    return {};
+  }
+
+  try {
+    const metaPath = await join(activeDataset, 'meta.json');
+    const metaText = await readTextFile(metaPath);
+    const parsedMeta: unknown = JSON.parse(metaText);
+
+    if (!isDatasetMeta(parsedMeta)) {
+      activeDatasetMeta.set(null);
+      activeDatasetImageMetas.set([]);
+      await goto('/boot');
+      return {};
+    }
+
+    activeDatasetMeta.set(parsedMeta);
+
+    const entries = await readDir(activeDataset);
+    const hasImagesMeta = entries.some((entry) => entry.name === 'images.json');
+
+    if (!hasImagesMeta) {
+      activeDatasetImageMetas.set([]);
+      return {};
+    }
+
+    const imagesPath = await join(activeDataset, 'images.json');
+    const imagesText = await readTextFile(imagesPath);
+    const parsedImages: unknown = JSON.parse(imagesText);
+    const imageMetas = Array.isArray(parsedImages) ? (parsedImages as ImageMeta[]) : [];
+
+    activeDatasetImageMetas.set(imageMetas);
+  } catch {
+    activeDatasetMeta.set(null);
+    activeDatasetImageMetas.set([]);
+    await goto('/boot');
+  }
+
+  return {};
+}) satisfies PageLoad;