[FEATURE] Add persistent session color setting

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

Add a color setting in settings.json to persist the session prompt color across sessions.

Current Behavior

• /color blue sets the color for the current session only
• Color resets on new session
• No color setting exists in settings.json

Proposed Solution

Add a color setting:

``json
{
"color": "blue"
}
``

Supported values could match the current /color command options: blue, red, green, yellow, magenta, cyan, white, etc.

Use Case

Users who prefer a specific color (e.g., for visual distinction, accessibility, or personal preference) currently need to run /color <color> manually at the start of every session. A
persistent setting would eliminate this repetitive step.

Alternative Solutions

None currently available — the /color command is runtime-only and cannot be automated via hooks (hooks run shell commands, not internal slash commands).

Priority

Low - Nice to have

Feature Category

Configuration and settings

Use Case Example

_No response_

Additional Context

_No response_