spinner animation looks broken in claude

possible fix: spinners should only be shown if it's a tty?


problematic output:

```
  ⎿  ⠋ ⠙ Updating issue ABC-101

     ⠋ ⠙ ⠹ ✓ Updated issue ABC-101:
```

also:

- remove --no-color flags from individual commands, either do it globally (like the workspace flag) or just use NO_COLOR env var
