Thinking Detection Toggle Behavior

What: Improved how the thinking detection disabled state works when users toggle it on/off

Details:

• Removed automatic re-enabling of thinking when users clear thinking tokens from input (previously in useEffect at line 437586-437588 in v1.0.114)
• Introduced computed "effective disabled" state (i1 at line 437849) that only treats thinking as disabled when both:

1. User has disabled thinking, AND
2. Thinking tokens are present in the input

• Visual feedback (border colors, shimmer effects) now shows thinking detection state more accurately
• User preference for disabled thinking now persists instead of being automatically reset
• Evidence: i1 variable at line 437849 in Yp5(), removed useEffect from previous version