feat: Scala support (Scala 2 / Scala 3 / Cats Effect)

[sub4biz]

What problem are you trying to solve?

Is your feature request related to a problem?

Currently, Understand-Anything does not include a Scala parser. Projects written in Scala - including those using functional effect systems like Cats Effect - cannot be analyzed.

Describe the solution you'd like

Add tree-sitter-scala as a dependency alongside the existing language parsers.

A single parser covers both Scala 2 and Scala 3, and standard Scala libraries (Cats Effect, ZIO, FS2, etc.) will then be analyzable without any additional changes.

Why this matters

The Scala/Typelevel ecosystem has a number of large, complex codebases where a tool like Understand-Anything would be especially valuable:

• Scala uses implicits / given instances extensively - understanding the call graph and type class hierarchy is non-trivial even for experienced developers
• Cats Effect introduces effect types (IO, Resource, Fiber) whose composition patterns are hard to reason about without a graph-based view
• Many Scala projects are multi-module SBT / Mill builds, making codebase navigation particularly tedious

Additional context

tree-sitter-scala is maintained under the official tree-sitter org and supports Scala 2 and Scala 3 syntax. It should integrate the same way as the existing parsers (tree-sitter-java, tree-sitter-go, etc.).

Proposed solution (optional)

No response

Alternatives you've considered

No response

Which part of the project?

No response