fix(pseo): error details collapse + UNIQUE constraint on slug

# Conflicts:
#	CHANGELOG.md

CHANGELOG.md

@@ -7,6 +7,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ## [Unreleased]
 
 ### Fixed
+- **pSEO error details collapse** — clicking "Error" on a job row expanded the details, but they collapsed after ~2s because HTMX polling replaced the `<tr>`. Jobs with errors now stop polling, keeping the `<details>` element stable.
+- **UNIQUE constraint on article slug** — `ON CONFLICT(url_path, language)` upsert failed because a separate single-column `UNIQUE` on `slug` fired first. Migration 0030 drops the redundant `UNIQUE` from `slug` (keeps the index for lookups and the composite `UNIQUE(url_path, language)`).
 - **Map country names** — 22 countries (PL, RO, CO, HU, ZA, KE, BR, CZ, QA, NZ, HR, LV, MT, CR, CY, PA, SV, DO, PE, VE, EE, ID) that appeared as bare ISO codes on the markets map and dropdown now show proper English/German names. Added country names to `dim_countries.sql`, `COUNTRY_LABELS` (i18n.py), and both locale files. Map tooltips and dropdown are now fully localised via `get_country_name()`.
 - **Map score tooltip clarity** — tooltip now shows both "Avg. Score" (country average) and "Top City" (highest location score) with separate color dots, making clear the map bubble color represents the country average — not a cap.