chore(webapp): enforce React Compiler lint

[carderne]

Summary

Enforces react/react-compiler as an error for the webapp now that all reported compiler diagnostics are fixed or narrowly scoped. Removes the unused lazy-ref helper made obsolete by the ref initialization cleanup.

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Latest commit: 5f2c794

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[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🔍 Enabling react/react-compiler only for apps/webapp/app; no local verification possible

The rule is enabled as error in the webapp override block, so any existing React Compiler violation across apps/webapp/app/**/*.{ts,tsx} will fail CI's code-quality job. I could not run oxlint in this environment (no installed toolchain), so the assumption that the whole webapp is already compiler-clean is unverified — worth confirming CI is green before merge. Note packages/react-hooks is deliberately left without this rule, which is an intentional scope choice but means hook code shipped to users isn't checked.

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