Fix: Translate task no longer auto-completes from existing langlinks

Eamedinarequested to merge
T428504-false-success into main

Picking an essential article (or the Five Pillars policy page) on a wiki that already has a langlinked translation caused the tool to skip past Step 2 and render "Article published!" / "Translation complete!" without the user opening Content Translation or creating anything (T428504).

Root cause: getTranslateCompletionStatus returned status 4 whenever checkIfArticleExistsByLanglink found any existing translation on the target wiki, regardless of authorship or the user's session. With completedStatuses [3, 4] in the registry, status 4 short-circuited the whole wizard to the success screen on every page load.

Changes:

  • getTranslateCompletionStatus now relies solely on the user's own CT draft/published state (statuses 0-3). Status 4 and the langlink helper are removed.
  • completedStatuses dropped from [3, 4] to [3] for create-essential-article and translate-policy-page.
  • useEssentialArticleSource adds a Wikidata-sitelink-aware filter so the picker no longer suggests articles that already exist on the target wiki under their native title (the previous English-title filter missed Mahatma Gandhi -> hi:महात्मा गांधी and similar).
  • New DELETE /api/tasks/:taskKey (session-scoped) wipes task_completions, task_checklists, and task_metadata for the caller's (wiki_url, task_key), giving QA a clean reset path on live wikis.

Bug: T428504 Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com

Closes T428504

Merge request reports