Enable new react-hooks v7 lint rules and lint scripts directory

[kraenhansen]

Context

In #72, we upgraded eslint-config-next from 15.x to 16.x to fix CI. The upgrade brought in eslint-plugin-react-hooks v7 which introduces several new rules. These were temporarily disabled to keep the fix focused.

Additionally, the scripts/ directory was excluded from linting since next lint never covered it, but it should be linted going forward.

Tasks

Enable new react-hooks v7 rules

The following rules are currently disabled in eslint.config.mjs and should be enabled (fixing violations as needed):

• react-hooks/set-state-in-effect (23 warnings)
• react-hooks/refs (18 warnings)
• react-hooks/exhaustive-deps — already enabled as warning, review remaining 17 violations
• react-hooks/immutability (5 warnings)
• react-hooks/purity (4 warnings)
• react-hooks/static-components (3 warnings)
• react-hooks/incompatible-library (1 warning)
• react-hooks/globals (1 warning)
• react-hooks/preserve-manual-memoization (1 warning)

Lint the scripts directory

• Remove scripts/ from the ESLint ignores in eslint.config.mjs
• Fix the 3 @typescript-eslint/no-explicit-any errors in scripts/build-registry.mts

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