Add curated essays and reading paths

Introduce a Library page and wire it into the main nav.
Add blog frontmatter fields: category, featuredEssay (default false),
and readingOrder (positive integer). Update several posts to mark
featured essays and assign readingOrder for the recommended path.

src/content/blog/after-the-silence.md

@@ -3,6 +3,8 @@ title: "After the Silence"
 description: "Reflections on what remains after a meaningful relationship ends, and how love can transform without disappearing."
 pubDate: 2026-03-04
 tags: ["love", "reflection", "healing", "relationships", "personal"]
+category: "reflection"
+featuredEssay: true
 ---
 
 When a relationship ends, the world does not become quiet immediately.

src/content/blog/coffee-and-code-1-building-quiet-corners-on-the-internet.md

@@ -3,6 +3,9 @@ title: "Coffee & Code #1 - Building Quiet Corners on the Internet"
 description: "Why personal websites still matter, and why I want Hidden Den to feel more like a quiet cafe than another loud platform."
 pubDate: 2026-03-07
 tags: ["coffee-and-code", "internet", "technology", "philosophy", "devlog", "personal website"]
+category: "internet"
+featuredEssay: true
+readingOrder: 2
 series:
   name: "Coffee & Code"
   part: 1

src/content/blog/hello-world.md

@@ -3,6 +3,9 @@ title: "Welcome to the Den"
 description: "First proper post. Why I built this site, what it runs on, and what to expect."
 pubDate: 2026-03-01
 tags: ["self-hosting", "privacy", "personal-web", "infrastructure"]
+category: "building"
+featuredEssay: true
+readingOrder: 1
 draft: false
 ---
 

src/content/blog/things-i-learned-from-loving-deeply.md

@@ -3,6 +3,9 @@ title: "Things I Learned From Loving Deeply"
 description: "Reflections on intimacy, trust, and the quiet ways meaningful love can continue shaping who we become."
 pubDate: 2026-03-07
 tags: ["love", "relationships", "reflection", "emotional growth", "intimacy"]
+category: "personal"
+featuredEssay: true
+readingOrder: 3
 ---
 
 Some relationships change you in quiet but permanent ways.

src/content/config.ts

@@ -7,6 +7,9 @@ const blog = defineCollection({
         description: z.string(),
         pubDate: z.coerce.date(),
         tags: z.array(z.string()).default([]),
+        category: z.string().optional(),
+        featuredEssay: z.boolean().optional().default(false),
+        readingOrder: z.number().int().positive().optional(),
         series: z
             .object({
                 name: z.string(),