Polish /report-bug's visual design and refine bug report semantics

Design pass on the bug report page, staying inside the site's existing
design system (tokens, IBM Plex Sans, card/badge/pill components, stroke
icon set) rather than introducing a new one:
- A slim top bar (brand mark + back-to-home pill button + language switcher)
  replaces the bare floating heading, so the page reads as part of the
  product instead of an orphaned form.
- The "write in English" notice moves inside the form card, right above the
  field it applies to, and switches from the amber "needs attention" tone to
  an accent-tinted info tone, so it doesn't visually collide with the
  bug-status badges' own use of amber for "not read yet".
- "Your reports" is promoted to a proper labeled section with a cleaner row
  layout (truncated description with a title tooltip, compact date).
- A character counter on the description field.
- The back-to-home control is now a bordered pill with an arrow icon instead
  of a bare text link with a hardcoded "←", which also meant dropping that
  hardcoded arrow from all 7 translations.

Also, two content refinements based on feedback:
- Max description length dropped from 5000 to 2000 characters, enforced on
  both the textarea and the API's Pydantic validator.
- The "read" status is relabeled from a passive "read"/"letta" to an active
  "acknowledged"/"presa in carico" (and each other language's own equivalent
  helpdesk term) — it communicates a team is on it, not just that someone
  glanced at it. Only the label changed; the underlying "read" status value
  in the API/DB is untouched.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/static/i18n.js

@@ -27,9 +27,9 @@ const TRANSLATIONS = {
     'bugReport.myReportsHint': 'Only reports sent from this account, with the status set by the admin team.',
     'bugReport.myReportsEmpty': "You haven't sent any reports yet.",
     'bugReport.statusOpen': 'Not read yet',
-    'bugReport.statusRead': 'Read',
+    'bugReport.statusRead': 'Acknowledged',
     'bugReport.statusResolved': 'Resolved',
-    'bugReport.backLink': '← Back to home',
+    'bugReport.backLink': 'Back to home',
     'nav.logoutTitle': 'Log out',
     'nav.logoutAria': 'Log out of your account',
     'nav.deposit': 'Deposit',
@@ -190,9 +190,9 @@ const TRANSLATIONS = {
     'bugReport.myReportsHint': "Solo le segnalazioni inviate da questo account, con lo stato aggiornato dall'amministrazione.",
     'bugReport.myReportsEmpty': 'Non hai ancora inviato segnalazioni.',
     'bugReport.statusOpen': 'Da leggere',
-    'bugReport.statusRead': 'Letta',
+    'bugReport.statusRead': 'Presa in carico',
     'bugReport.statusResolved': 'Risolta',
-    'bugReport.backLink': '← Torna alla home',
+    'bugReport.backLink': 'Torna alla home',
     'nav.logoutTitle': 'Esci',
     'nav.logoutAria': "Esci dall'account",
     'nav.deposit': 'Deposito',
@@ -350,9 +350,9 @@ const TRANSLATIONS = {
     'bugReport.myReportsHint': 'Solo los informes enviados desde esta cuenta, con el estado actualizado por el equipo de administración.',
     'bugReport.myReportsEmpty': 'Todavía no has enviado ningún informe.',
     'bugReport.statusOpen': 'Sin leer',
-    'bugReport.statusRead': 'Leído',
+    'bugReport.statusRead': 'En curso',
     'bugReport.statusResolved': 'Resuelto',
-    'bugReport.backLink': '← Volver al inicio',
+    'bugReport.backLink': 'Volver al inicio',
     'nav.logoutTitle': 'Salir',
     'nav.logoutAria': 'Cerrar sesión',
     'nav.deposit': 'Depósito',
@@ -510,9 +510,9 @@ const TRANSLATIONS = {
     'bugReport.myReportsHint': "Seulement les signalements envoyés depuis ce compte, avec le statut mis à jour par l'équipe d'administration.",
     'bugReport.myReportsEmpty': "Vous n'avez encore envoyé aucun signalement.",
     'bugReport.statusOpen': 'Non lu',
-    'bugReport.statusRead': 'Lu',
+    'bugReport.statusRead': 'Prise en charge',
     'bugReport.statusResolved': 'Résolu',
-    'bugReport.backLink': "← Retour à l'accueil",
+    'bugReport.backLink': "Retour à l'accueil",
     'nav.logoutTitle': 'Se déconnecter',
     'nav.logoutAria': 'Se déconnecter du compte',
     'nav.deposit': 'Dépôt',
@@ -670,9 +670,9 @@ const TRANSLATIONS = {
     'bugReport.myReportsHint': 'Nur Meldungen, die von diesem Konto gesendet wurden, mit dem vom Admin-Team aktualisierten Status.',
     'bugReport.myReportsEmpty': 'Du hast noch keine Meldungen gesendet.',
     'bugReport.statusOpen': 'Ungelesen',
-    'bugReport.statusRead': 'Gelesen',
+    'bugReport.statusRead': 'In Bearbeitung',
     'bugReport.statusResolved': 'Gelöst',
-    'bugReport.backLink': '← Zurück zur Startseite',
+    'bugReport.backLink': 'Zurück zur Startseite',
     'nav.logoutTitle': 'Abmelden',
     'nav.logoutAria': 'Vom Konto abmelden',
     'nav.deposit': 'Einzahlung',
@@ -830,9 +830,9 @@ const TRANSLATIONS = {
     'bugReport.myReportsHint': 'Только сообщения, отправленные с этого аккаунта, со статусом, обновлённым администрацией.',
     'bugReport.myReportsEmpty': 'Вы ещё не отправляли сообщений.',
     'bugReport.statusOpen': 'Не прочитано',
-    'bugReport.statusRead': 'Прочитано',
+    'bugReport.statusRead': 'В обработке',
     'bugReport.statusResolved': 'Решено',
-    'bugReport.backLink': '← Назад на главную',
+    'bugReport.backLink': 'Назад на главную',
     'nav.logoutTitle': 'Выйти',
     'nav.logoutAria': 'Выйти из аккаунта',
     'nav.deposit': 'Депозит',
@@ -990,9 +990,9 @@ const TRANSLATIONS = {
     'bugReport.myReportsHint': '仅显示此账户发送的反馈，状态由管理团队更新。',
     'bugReport.myReportsEmpty': '您还没有发送过反馈。',
     'bugReport.statusOpen': '待处理',
-    'bugReport.statusRead': '已读',
+    'bugReport.statusRead': '处理中',
     'bugReport.statusResolved': '已解决',
-    'bugReport.backLink': '← 返回首页',
+    'bugReport.backLink': '返回首页',
     'nav.logoutTitle': '退出登录',
     'nav.logoutAria': '退出账户',
     'nav.deposit': '存款',