[DOCS] Add MDX Article: "Stream Ciphers vs Block Ciphers — A Practical Comparison"

[Aakif-Kohari]

Summary

The Docs module currently has no article comparing stream vs block cipher constructions, even though the visualizer will (pending #2/#4 above) contain examples of both. This article ties the concept together for learners moving between cipher demos.

What's missing

• No MDX file in content/docs/ covering this comparison topic

Proposed content

• New .mdx file with required Zod frontmatter fields (per repo's docs-module contract in CONTRIBUTING.md)
• Covers: block vs stream construction, padding/IV handling, error propagation differences, when each is chosen in real protocols (TLS cipher suites as example), with backtick-tag auto-links to existing visualizer entries (e.g. `AES`, `XOR`) using the repo's existing auto-linking MDX plugin
• Isolated file — does not touch registry.ts/types.ts/worker.ts, so no merge-conflict risk with issues 1–4

Acceptance criteria

• Frontmatter validates against the docs Zod schema
• Reading-time/TOC generation works without errors
• Cipher backtick auto-links resolve correctly
• Renders correctly in both dark and light mode

Assignment

I'd like to work on this issue under ECSoC26. Will open a PR only after approval/assignment by @csxark or another maintainer.

[github-actions]

🎉 Issue Assigned

Hi @Aakif-Kohari, I'm assigning this initiative to you.

Looking forward to your contributions!

Please do the following before coding:

• ✅ Sync your fork with the latest main
• ✅ Create a new feature branch
• ✅ Implement the requested changes
• ✅ Test your work
• ✅ Open a PR referencing this issue

Wishing you the very best, and happy contributing! 🚀🚀