[Feature Request] Restore quick-access thinking mode toggle and visual indicator

Bug Description
Seemingly disabling the "Tab" to cycle thinking mode on and off, removing the blue border indication, and moving the setting to /config panel, very far out of the way and inconvenient/slow to access, is frankly egregious, offensive, shocking, repulsive, and disgusting greed. I hope this is a bug of some kind and not intentional, but I fear it may signal intent to increase accidental limit moments in the name of more plan upgrades. I noticed when the mobile app also made thinking a default silently recently (which may have been reverted), but this trend is shaking my trust in Anthropic.

Environment Info

• Platform: darwin
• Terminal: tmux
• Version: 2.0.67
• Feedback ID: 60d71f1c-7138-4b51-aa95-37c12e3dc433

Errors

[{"error":"Error\n    at KU (/$bunfs/root/claude:59:1143)\n    at <anonymous> (/$bunfs/root/claude:60:10080)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:62:2147)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-12T22:17:35.907Z"},{"error":"Error\n    at KU (/$bunfs/root/claude:59:1143)\n    at <anonymous> (/$bunfs/root/claude:60:10080)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:62:2147)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-12T22:17:36.115Z"}]