Support spinnerVerbs customization in desktop app

Feature Request

The spinnerVerbs setting in ~/.claude/settings.json works great in the CLI terminal, but the desktop app ignores it and shows hardcoded loading text ("Thinking...", "Computing...") instead.

It would be nice if the desktop app respected the same spinnerVerbs config so users can have a consistent experience across both the CLI and desktop app.

Current Behavior

• CLI: Reads spinnerVerbs from ~/.claude/settings.json and uses custom verbs in the spinner
• Desktop app: Ignores spinnerVerbs, always shows hardcoded "Thinking..." / "Computing..."

Expected Behavior

The desktop app should read and respect the spinnerVerbs setting from ~/.claude/settings.json, matching the CLI behavior.

Example Config

{
  "spinnerVerbs": {
    "mode": "replace",
    "verbs": ["Enhancing", "Transmuting", "Emitting", "Conjuring", "Manipulating", "Specializing"]
  }
}