tighten backend regression coverage

Add targeted tests for rejection paths, settlement overrides, and key analytics flows, and align localization/research docs with the shipped contract.

docs/localization-catalog.md

@@ -30,41 +30,18 @@
 | `feed.next_round_body` | Next round body |
 | `feed.watch_preview` | Watch preview CTA |
 | `feed.round_ready` | Round ready label |
-| `feed.title` | Feed title |
-| `feed.subtitle` | Feed subtitle |
-| `feed.hero_title` | Feed hero title |
-| `feed.hero_subtitle` | Feed hero subtitle |
-| `feed.lock_label` | Feed lock label |
-| `feed.odds_label` | Feed odds label |
-| `feed.cta` | Feed CTA |
 | `round.countdown_label` | Countdown label |
 | `round.locked_label` | Locked label |
 | `round.selection_prompt` | Selection prompt |
 | `round.selection_confirmed` | Selection accepted |
 | `round.selection_submitting` | Selection submitting |
 | `round.odds_label` | Odds label |
-| `round.title` | Round title |
-| `round.subtitle` | Round subtitle |
-| `round.video_placeholder` | Video placeholder |
-| `round.preview_label` | Preview label |
-| `round.primary_cta` | Round confirm CTA |
-| `round.home` | Home outcome label |
-| `round.away` | Away outcome label |
 | `reveal.title` | Reveal title |
 | `reveal.subtitle` | Reveal subtitle |
-| `reveal.status` | Reveal status |
-| `reveal.cta` | Reveal CTA |
 | `result.title` | Result title |
-| `result.selection_label` | Result selection label |
-| `result.outcome_label` | Result outcome label |
-| `result.win` | Winning result label |
-| `result.lose` | Losing result label |
+| `result.user_selection` | Result selection label |
+| `result.outcome` | Result outcome label |
 | `result.next_round` | Next round CTA |
-| `result.subtitle` | Result subtitle |
-| `result.selection_label` | Result selection label |
-| `result.outcome_label` | Result outcome label |
-| `result.win` | Winning result label |
-| `result.lose` | Losing result label |
 | `settings.title` | Settings title |
 | `settings.language` | Language setting |
 | `settings.haptics` | Haptics setting |
@@ -73,3 +50,8 @@
 | `errors.network` | Network error copy |
 | `errors.playback` | Playback error copy |
 | `errors.session_expired` | Session expired copy |
+
+## Validation
+
+- English and Swedish bundles must contain the same keys
+- Empty values are not allowed