refactor(address-search): unify modal state into discriminated union

[divazbozz]

Summary

• Replace three independent modal useStates (multipleUtilityResult, multipleAddressResults, energySplashRedirectUrl) in AddressSearchApp.tsx with a single ModalState discriminated union.
• handleSelect branches now each issue one setModalState(...) call — no more manual clears of sibling modal states.
• handleBack resets to { kind: "idle" } (preserves prior semantics: also clears selection / externalAddressId).
• addressConfirmData stays separate — it's a confirmation concern, not a routing one.

Test plan

• npx tsc --noEmit clean
• npm run lint clean
• npm run build succeeds
• Manual: verify multiple-utility modal renders, multiple-address modal renders, energy-only splash renders, and Back resets to idle
• Manual: verify confirm modal still works independently and doesn't interact with routing modal state

🤖 Generated with Claude Code

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