[FEATURE] highlight fish shell syntax

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

claude code doesn't highlight fish shell syntax. this is embarrassing and demonstrates lack of cultural awareness.

<img width="1277" height="1005" alt="Image" src="https://github.com/user-attachments/assets/551e2403-eb22-4e92-a269-9ecf0f4eed2f" />

Proposed Solution

highlight fish shell syntax.

Alternative Solutions

continue to broadcast lack of taste

Priority

Low - Nice to have

Feature Category

Interactive mode (TUI)

Use Case Example

1. i prompt claude to write fish shell syntax
2. i notice syntax is not highlighted
3. i stare into the abyss
4. i reevaluate my life choices

Additional Context

• https://github.com/ram02z/tree-sitter-fish