Allow customization or disabling of loading phrases

Feature Request

The loading phrases shown while Claude is thinking (e.g. \"julienning...\", etc.) are charming, but some users would prefer to customize or disable them.

Proposed Solution

Add a setting in settings.json to control this behavior, for example:

• "loadingPhrases": false — disables custom phrases entirely (shows a plain spinner or nothing)
• "loadingPhrases": ["custom", "phrases", "here"] — allows user-defined phrases

Use Case

Users who find the phrases distracting or prefer a more minimal UI would benefit from being able to turn them off or replace them with their own.