[FEATURE] Customizing the busy spinner message list.

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

I spend my entire working day talking to multiple incarnations of claude-code. Having themes would be nice. I can tailor response dialect with a simple Claude.md line like "you are a new yorker -- you speak quick and to the point".

But there is no way to replace "Percolating" with something that persona would use.

Everything else I stare out all day has themes....

Proposed Solution

Rather than hard coding a list, add a config item to the json that allows a list. if you really want to get vigilant about it, also have an edit-list syntax (e.g. remove "Percolating" and add "Percolatin'")

Alternative Solutions

Prebuilt themes?

Priority

Low - Nice to have

Feature Category

Interactive mode (TUI)

Use Case Example

_No response_

Additional Context

_No response_