feat(highlight): migrate to tree-house with Helix queries

Replace tree-sitter-highlight dep with tree-house crate from Helix
editor. Add ropey dependency required by tree-house.

Reorganize query files from Helix's runtime/queries/ for all 14
supported languages:
- bash, c, css, go, html, javascript, json, markdown, nix, python,
  rust, toml, typescript, yaml
- Include ecma, _javascript, _typescript base dirs for JS/TS inheritance
- Copy highlights.scm, injections.scm, locals.scm where available

This commit establishes the foundation; highlight.rs implementation
will follow in subsequent commits.

Cargo.toml

@@ -12,12 +12,13 @@ thiserror      = "2"
 walkdir        = "2"
 
 # Syntax highlighting
+ropey                  = "1.6"
+tree-house             = { git = "https://github.com/helix-editor/tree-house", package = "tree-house" }
 tree-sitter            = "0.26"
 tree-sitter-bash       = "0.23"
 tree-sitter-c          = "0.24"
 tree-sitter-css        = "0.25"
 tree-sitter-go         = "0.25"
-tree-sitter-highlight  = "0.26"
 tree-sitter-html       = "0.23"
 tree-sitter-javascript = "0.25"
 tree-sitter-json       = "0.24"