Add Gleam language support

[nikhilkalburgi45]

This PR adds basic syntax highlighting for Gleam.

Gleam isn’t currently supported in Prism, and the Rust grammar people often fall back on doesn’t map well especially around pipes, pattern matching, and type usage. This adds a dedicated language definition.

What’s covered

• Comments: line (//), doc (///), and module doc (////)
• Strings with standard escape sequences
• Attributes (@external, @internal, etc.)
• Keywords: fn, let, use, case, type, import, pub, opaque, const, as, panic, todo, if, else
• Numbers: decimal (with _), hex (0x), binary (0b), scientific notation
• Built-in types: Int, Float, String, Bool, List, Result, Option, Nil
• Boolean literals: True, False
• Operators: |>, <>, ->, .., plus standard arithmetic and comparison operators
• Function calls (best-effort detection)

Test cases are included under tests/languages/gleam/, covering typical usage (functions, pipelines, numbers, etc.).

Limitations

• Type names fall back to an uppercase heuristic when not explicitly listed.
• Function detection is best-effort and may match some non-function identifiers.
• case pattern matching isn’t deeply tokenized to avoid overly complex regex.

Files

• src/languages/gleam.js
• src/components.json
• tests/languages/gleam/

Note

I ran into an ESM path issue on Windows (ERR_UNSUPPORTED_ESM_URL_SCHEME) when running the full test suite. This appears to be environment-related rather than specific to the Gleam implementation. Happy to run tests via WSL if needed.

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