feat: More programming languages

[ikorich]

Summary

Add more programming languages to the language picker.

Motivation

Users work with many languages beyond the current 19.

Languages to Add

• Markdown
• Dockerfile
• Terraform
• GraphQL
• Scala
• Elixir
• Haskell
• Lua

Implementation

Extend commonLanguages array in ToolBarView.swift

Acceptance Criteria

• New languages appear in picker
• Syntax highlighting works correctly
• No performance impact

Story Points

2 points