fix(web): allow switching away from Ultrathink without manual prompt editing

[Marve10s]

Summary

• When Ultrathink was active, the effort dropdown was fully disabled and showed "Remove Ultrathink from the prompt to change effort." — forcing the user to manually edit the prompt to switch effort levels.
• Now selecting a different effort level automatically strips the Ultrathink: prefix from the prompt and applies the new effort.
• The radio group correctly highlights "Ultrathink" when it's active via the prompt.

Test plan

• Select Claude Opus/Sonnet, choose Ultrathink from effort dropdown — prompt gets Ultrathink: prefix
• While Ultrathink is active, select a different effort (e.g. High) — Ultrathink: prefix is removed, effort switches
• Re-select Ultrathink — prefix is added back
• Verify compact composer controls menu behaves the same way

Note

Allow switching away from Ultrathink effort without manual prompt editing

• When Ultrathink is active via a prompt prefix, the Effort menu is now fully interactive instead of showing a disabled state with an instructional message.
• Selecting a non-Ultrathink effort strips the ultrathink prefix from the prompt (case-insensitive, word-boundary regex) and applies the new effort setting via onPromptChange.
• Selecting the Ultrathink effort inserts the prompt prefix as before.
• Behavioral Change: the handleEffortChange callback in ClaudeTraitsPicker.tsx no longer early-returns when ultrathinkPromptControlled is true, so prompt mutation now happens automatically on effort switch.

^{Macroscope summarized 8a2887b.}

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