feat(stats): verdict hero + goals-by-round chart (Stage B)

- Verdict hero: champion (trophy + flag + name) and a 2/3/4 podium
  (runner-up/3rd/4th) above the shared count-up tiles. Gated on the REAL
  final via computeVerdict() — getBracketTree()'s FINAL node must be a real
  finished result (!simulated), so a user's simulated champion never leaks
  into the verdict. Third/fourth from the third-place match, independently.
  Falls back to the existing aggregate 'in progress' hero until the final is
  in, so an early merge stays correct.
- Goals-by-round chart beside goals-by-stage: group stage split into its 3
  matchdays (derived per group; no matchday field exists) plus each knockout
  round. Hidden until >=2 rounds have data so it never duplicates the
  goals-by-stage Group bar early on.
- stats.js imports getBracketTree from bracket.js (4th circular import with
  app.js, render-time only). i18n stats.goalsByRound/matchday/verditTitle/
  runnerUp/thirdPlace/fourthPlace (EN/PT); verdict-hero CSS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

assets/js/i18n.js

@@ -131,7 +131,13 @@ const dicts = {
     'stats.decisive': 'Decisive',
     'stats.draws': 'Draws',
     'stats.goalsByPhase': 'Goals by stage',
+    'stats.goalsByRound': 'Goals by round',
+    'stats.matchday': 'Matchday',
     'stats.stageGroup': 'Group stage',
+    'stats.verdictTitle': 'Final verdict',
+    'stats.runnerUp': 'Runner-up',
+    'stats.thirdPlace': 'Third place',
+    'stats.fourthPlace': 'Fourth place',
     'stats.teamStatsTitle': 'Team statistics',
     'stats.colGpg': 'G/M',
     'stats.colCS': 'CS',
@@ -278,7 +284,13 @@ const dicts = {
     'stats.decisive': 'Decididas',
     'stats.draws': 'Empates',
     'stats.goalsByPhase': 'Gols por fase',
+    'stats.goalsByRound': 'Gols por rodada',
+    'stats.matchday': 'Rodada',
     'stats.stageGroup': 'Fase de grupos',
+    'stats.verdictTitle': 'Veredito final',
+    'stats.runnerUp': 'Vice-campeão',
+    'stats.thirdPlace': 'Terceiro lugar',
+    'stats.fourthPlace': 'Quarto lugar',
     'stats.teamStatsTitle': 'Estatísticas por time',
     'stats.colGpg': 'G/J',
     'stats.colCS': 'CS',