Update plan curtailment modal form layout

[negarn]

🤖

Summary

• Rework the plan curtailment modal into response profile, reason, curtail behavior, restore behavior, and target sections while preserving the existing input/control sizing.
• Constrain curtailment behavior to the API-supported values: fixed kW reduction and least efficient first.
• Remove unsupported percentage reduction, alternate miner selection strategies, curtail batch controls, and the Safety section from the form.
• Keep the preview copy aligned with the existing estimated reduction vs requested reduction behavior.
• Default maintenance-mode miner inclusion to checked, remove its helper line, and require confirmation before submitting with maintenance miners included.
• Update modal tests and stories for the supported layout and payload behavior.

Test plan

• git diff --check
• bin/npx prettier --check src/protoFleet/features/energy/CurtailmentStartModal.tsx src/protoFleet/features/energy/CurtailmentStartModal.test.tsx src/protoFleet/features/energy/CurtailmentStartModal.stories.tsx
• bin/npx vitest run src/protoFleet/features/energy/CurtailmentStartModal.test.tsx
• bin/npx eslint src/protoFleet/features/energy/CurtailmentStartModal.tsx src/protoFleet/features/energy/CurtailmentStartModal.test.tsx src/protoFleet/features/energy/CurtailmentStartModal.stories.tsx --max-warnings 0
• bin/npx tsc --noEmit
• bin/npm run build:protoFleet
• PR CI passed after rerunning the transient generated-code check

Screen.Recording.2026-05-19.at.8.45.35.AM.mov

Closes #242

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[chatgpt-codex-connector]

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Reviewed commit: f3b7f5eafd

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