fix(translate): fallback for empty translatedTitle in toggle _category_.json + tests

[luandro]

Summary

Scope: scripts/notion-translate/index.ts, scripts/notion-translate/index.test.ts, scripts/verify-locale-output.test.ts only. No changes to docs content, CI config, or other scripts.

• Adds an explicit fallback in saveTranslatedContentToDisk so that when translatedTitle is empty or whitespace-only, both label and customProps.title in the toggle _category_.json use the English source title (already computed via getTitle(englishPage)) and finally "Untitled" — instead of writing an empty string.
• Adds three unit tests covering the fallback (empty string, whitespace-only, and happy-path non-empty translated title) and one regression test asserting elementType: "Page" never produces a _category_.json.
• Adds a locale-output integration test that recursively globs all _category_.json files under i18n/es/ and i18n/pt/ and asserts every label is a non-empty string. Gracefully skips when the content branch is not checked out (ENOENT pattern already used in the file).

Closes #158, closes #159 (part of umbrella #157)

Test plan

• bunx vitest run scripts/notion-translate/index.test.ts — all new describe blocks pass
• bunx vitest run scripts/verify-locale-output.test.ts — new _category_.json label test passes (or skips gracefully if content branch not present)
• Confirm no untracked files (context/tasks/, reviews/, scripts/audit-language-field.ts) were included in the commit

[github-actions]

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[github-actions]

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[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Overview

Severity	Count
CRITICAL	0
WARNING	0
SUGGESTION	0

Note: The previous review noted a capitalization inconsistency ("Untitled" vs "untitled"). This has been addressed in commit 270c660 which changed the fallback to use lowercase "untitled" to match getTitle() default.

Files Reviewed (3 files)

• scripts/notion-translate/index.ts - Fix implemented correctly with proper fallback logic
• scripts/notion-translate/index.test.ts - 4 new tests added, comprehensive coverage
• scripts/verify-locale-output.test.ts - Integration test added for regression prevention

Review Details

The fix is well-implemented. The fallback chain translatedTitle?.trim() || title || "untitled" correctly handles:

• Empty string translatedTitle → falls back to English title
• Whitespace-only translatedTitle → falls back to English title
• Both empty → falls back to "untitled" (lowercase, matching getTitle())

Tests cover all edge cases including a regression test to ensure Page-type content doesn't produce _category_.json files. The integration test provides good ongoing regression prevention.

[luandro]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

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[github-actions]

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