feat: add blu-site static site generator and fix language issues

Build a complete static site generator in Lux that faithfully clones
blu.cx (elmstatic). Generates 14 post pages, section indexes, tag pages,
and a home page with snippets grid from markdown content.

Language fixes discovered during development:
- Add \{ and \} escape sequences in string literals (lexer)
- Register String.indexOf and String.lastIndexOf in type checker
- Fix formatter to preserve brace escapes in string literals
- Improve LSP hover to show documentation for let bindings and functions

ISSUES.md documents 15 Lux language limitations found during the project.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

projects/blu-site/content/journal/2025-01-01-jan25.md

@@ -0,0 +1,21 @@
+---
+title: January 2025
+description: Journal
+tags: journal
+---
+
+---
+
+_2025-01-21_ - _Accountless AI Editors Paid with Bitcoin_
+
+[ppq.ai](https://ppq.ai/) is a website that allows you to use pretty much any AI model using bitcoin micropayments (via the Lightning Network) instead of having to apply for a subscription or pay with a credit card. I hate that the modern web requires email accounts and either subscriptions or ads for everything, and love the idea of using micropayments for non-recurring and/or anonymous and/or just plain more convenient purchases online.
+
+This is one of my favorite applications of micropayments I've seen so far. Excitingly, they have an API key in addition to the web interface, which meant that I was able to get [neovim](https://neovim.io/) working like the [Cursor](https://www.cursor.com/) code editor using the [avante](https://github.com/yetone/avante.nvim) neovim plugin by customizing my config! So now, I finally have a way to _accountlessly_, _privately_, and _subscription-less-ly_ pay for a service I very much want to use. Exciting times! I will gladly pay for this service now for my AI code-editing needs, over paying flat rates for subscription-based things like Cursor. I will try to do a writeup on how to do this soon.
+
+---
+
+_2025-01-20 - Inauguration Day_
+
+- Idea: **Quote Scrolls** - Looping scrolls with quotes on them that people can sift through. Would be good for museums to be able to collate a bunch of famous things said about/by the place/person on exhibit.
+
+- I wonder if there is a portable version of Markdown files? Something like a PDF, which includes all embedded image or other data, but also has the nice edit-ability properties of a Markdown file. One of the troubles with Markdown now is figuring out how to export/import them around. Do you just zip the .md and image/video files referenced in the same directory? What if the path to the desired image or video wasn't in the same directory when you wrote it? This could perhaps be something as simple as a standardized and agreed-upon way to put referenced files of different types in folders of the same name (e.g. a "videos" and "images" directory standard co-located with the .md file).