feat(ai-translation): translate Lexical Poll node

[Innei]

Summary

• Adds AI translation for Lexical Poll nodes (type: 'poll'): the question and every non-empty option.label are now extracted as PropertySegments by the translation parser, translated, and written back in place. All non-translatable metadata (pollId, options[i].id, mode, closeAt, showResults, type, version) is preserved verbatim.
• Implementation mirrors the existing Excalidraw special-case in walkNode: extract before the skip-block checks and emit segments with the appropriate node ref (the option object itself for labels) so the existing string-path restore writes back to option.label directly. No changes to restoreLexicalTranslation or the property-whitelist util.
• Includes a build fix (fix(build): guard __DEV__/__TEST__ macros for non-vite contexts) — the vite define macros added in 1783b79 are not substituted in vitest's globalSetup (which runs outside vite), causing ReferenceError: __DEV__ is not defined and breaking the entire test suite. Guards added so the module works in both contexts.

Spec

docs/superpowers/specs/2026-05-12-lexical-poll-translation-design.md

Test plan

• pnpm -C apps/core exec vitest run test/src/modules/ai/lexical-translation-parser.spec.ts — all 54 cases pass, including 4 new poll cases (parse, round-trip restore, empty-label skip, nested in details)
• pnpm -C apps/core exec eslint --max-warnings 0 clean on all changed files
• Translate a real post containing a poll end-to-end and verify the rendered translated post shows translated question + option labels

[safedep]

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