refactor: standardize code formatting across components and utilities

- Updated formatting in SiteFooter and SiteHeader components for consistency.
- Refactored Badge, Button, Card, Separator components to improve readability.
- Enhanced markdown parsing logic in announcements and markdown utility functions.
- Adjusted ESLint configuration for better code quality checks.
- Added biome.json for BiomeJS configuration.
- Updated package.json and configuration files for improved dependency management.

lib/announcements.ts

@@ -6,88 +6,95 @@ import { markdownToHtml } from "@/lib/markdown";
 const ANNOUNCEMENTS_DIR = path.join(process.cwd(), "content", "announcements");
 
 type AnnouncementFrontmatter = {
-  title?: string;
-  date?: string;
-  summary?: string;
+	title?: string;
+	date?: string;
+	summary?: string;
 };
 
 export type AnnouncementListItem = {
-  slug: string;
-  title: string;
-  date: string;
-  summary: string;
+	slug: string;
+	title: string;
+	date: string;
+	summary: string;
 };
 
 export type AnnouncementDetail = AnnouncementListItem & {
-  contentHtml: string;
+	contentHtml: string;
 };
 
 function parseFrontmatter(markdown: string): {
-  frontmatter: AnnouncementFrontmatter;
-  body: string;
+	frontmatter: AnnouncementFrontmatter;
+	body: string;
 } {
-  if (!markdown.startsWith("---\n")) {
-    return { frontmatter: {}, body: markdown };
-  }
+	if (!markdown.startsWith("---\n")) {
+		return { frontmatter: {}, body: markdown };
+	}
 
-  const end = markdown.indexOf("\n---\n", 4);
-  if (end === -1) {
-    return { frontmatter: {}, body: markdown };
-  }
+	const end = markdown.indexOf("\n---\n", 4);
+	if (end === -1) {
+		return { frontmatter: {}, body: markdown };
+	}
 
-  const rawFrontmatter = markdown.slice(4, end);
-  const body = markdown.slice(end + 5);
-  const frontmatter: AnnouncementFrontmatter = {};
+	const rawFrontmatter = markdown.slice(4, end);
+	const body = markdown.slice(end + 5);
+	const frontmatter: AnnouncementFrontmatter = {};
 
-  for (const line of rawFrontmatter.split("\n")) {
-    const delimiterIndex = line.indexOf(":");
-    if (delimiterIndex <= 0) {
-      continue;
-    }
+	for (const line of rawFrontmatter.split("\n")) {
+		const delimiterIndex = line.indexOf(":");
+		if (delimiterIndex <= 0) {
+			continue;
+		}
 
-    const key = line.slice(0, delimiterIndex).trim();
-    const value = line.slice(delimiterIndex + 1).trim().replace(/^"|"$/g, "");
+		const key = line.slice(0, delimiterIndex).trim();
+		const value = line
+			.slice(delimiterIndex + 1)
+			.trim()
+			.replace(/^"|"$/g, "");
 
-    if (key === "title" || key === "date" || key === "summary") {
-      frontmatter[key] = value;
-    }
-  }
+		if (key === "title" || key === "date" || key === "summary") {
+			frontmatter[key] = value;
+		}
+	}
 
-  return { frontmatter, body: body.trim() };
+	return { frontmatter, body: body.trim() };
 }
 
 export async function getAnnouncementSlugs(): Promise<string[]> {
-  const entries = await fs.readdir(ANNOUNCEMENTS_DIR, { withFileTypes: true });
+	const entries = await fs.readdir(ANNOUNCEMENTS_DIR, { withFileTypes: true });
 
-  return entries
-    .filter((entry) => entry.isFile() && entry.name.endsWith(".md"))
-    .map((entry) => entry.name.replace(/\.md$/, ""));
+	return entries
+		.filter((entry) => entry.isFile() && entry.name.endsWith(".md"))
+		.map((entry) => entry.name.replace(/\.md$/, ""));
 }
 
-export async function getAnnouncementBySlug(slug: string): Promise<AnnouncementDetail> {
-  const filePath = path.join(ANNOUNCEMENTS_DIR, `${slug}.md`);
-  const markdown = await fs.readFile(filePath, "utf-8");
-  const { frontmatter, body } = parseFrontmatter(markdown);
+export async function getAnnouncementBySlug(
+	slug: string,
+): Promise<AnnouncementDetail> {
+	const filePath = path.join(ANNOUNCEMENTS_DIR, `${slug}.md`);
+	const markdown = await fs.readFile(filePath, "utf-8");
+	const { frontmatter, body } = parseFrontmatter(markdown);
 
-  return {
-    slug,
-    title: frontmatter.title ?? slug,
-    date: frontmatter.date ?? "日付未設定",
-    summary: frontmatter.summary ?? "",
-    contentHtml: markdownToHtml(body),
-  };
+	return {
+		slug,
+		title: frontmatter.title ?? slug,
+		date: frontmatter.date ?? "日付未設定",
+		summary: frontmatter.summary ?? "",
+		contentHtml: markdownToHtml(body),
+	};
 }
 
 export async function getAllAnnouncements(): Promise<AnnouncementListItem[]> {
-  const slugs = await getAnnouncementSlugs();
-  const items = await Promise.all(slugs.map((slug) => getAnnouncementBySlug(slug)));
+	const slugs = await getAnnouncementSlugs();
+	const items = await Promise.all(
+		slugs.map((slug) => getAnnouncementBySlug(slug)),
+	);
 
-  return items
-    .map((item) => ({
-      slug: item.slug,
-      title: item.title,
-      date: item.date,
-      summary: item.summary,
-    }))
-    .sort((a, b) => b.date.localeCompare(a.date));
+	return items
+		.map((item) => ({
+			slug: item.slug,
+			title: item.title,
+			date: item.date,
+			summary: item.summary,
+		}))
+		.sort((a, b) => b.date.localeCompare(a.date));
 }