feat: implement dark mode with theme toggle

- Add dark mode support across all components and pages
- Implement theme toggle button in navbar (desktop and mobile)
- Fix desktop theme toggle icon visibility issue
- Add dark mode color variants to all text, backgrounds and components
- Update Tailwind config to enable class-based dark mode
- Add dark mode support to prose styles for blog content
- Persist theme preference in localStorage
- Update all pages (index, bio, blog) with dark mode colors
- Optimize images (me.png and me-baby.jpg)

src/content/blog/welcome-to-my-blog.md

@@ -1,7 +1,7 @@
 ---
 title: "Welcome to My Blog!"
 description: "First commit"
-pubDate: 2024-01-15
+pubDate: 2026-01-08
 heroImage: "../../assets/photos/remote.jpg"
 tags: ["personal", "welcome"]
 ---
@@ -9,7 +9,7 @@ tags: ["personal", "welcome"]
 Hi, I’m Lorenzo.
 
 I’ve been thinking about writing for a long time, and I finally decided to publish this blog.
-Not to be “a creator” or something like that — just to keep track of what I learn and share it with whoever finds it useful.
+Not to be “a creator” or something like that, just to keep track of what I learn and share it with whoever finds it useful.
 
 ## What you will find here