kobotoolbox / kpi / 28398193226

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feat(bulkProcessing): already translated alert DEV-1403 (#7185)

### 📣 Summary

Bulk translation modal now detects and skips submissions that already
have translations in the selected language.

### 💭 Notes

Changes here:

- **alertEvaluators.ts**: Replaced the stub for
`evaluateAlreadyTranslated()` with actual logic that:
- Checks each submission's `_supplementalDetails` for existing
translations in the selected language
  - Skips submissions already filtered by higher-priority alerts
  - Calculates total character count across all existing translations
  - Returns a warning alert with count and character totals for the UI
  
- **alertEvaluators.tests.ts**: Added 7 test cases covering:
  - No language selected (alert should not show)
  - No existing translations (alert should not show)
- Multiple submissions with translations (alert should show, correct
counts)
  - Mixed languages (only selected language triggers alert)
  - Empty/null translation values (should not trigger alert)
  - Previous filtering (respects earlier alerts)
  - Field xpath matching (only checks the correct question)

### 👀 Preview steps

1. ℹ️ Have a project with audio/text questions and some submissions
2. Go to Project → Data → Table
3. Add a transcript and translation (e.g. "German") to a submission
using the single processing view
4. Go back to Data Table
5. Select multiple submissions including the one with existing
translation
6. Click the header column dropdown → "Translate selected…"
7. Select the same language you used in step 3 (e.g. "German")
8. 🟢 Notice the warning alert appears: "X transcripts totaling Y
characters already translated and will be ignored"
9. 🟢 Notice the submission count in the modal updates to reflect only
eligible submissions

9234 of 12573 branches covered (73.44%)

30142 of 37028 relevant lines covered (81.4%)

5.52 hits per line