feat(workbench): add DBN Case Workbench guided case-preparation hub

Additive-only change: new workbench.php authenticated page with guided
intake flow, evidence map, tool sequence, output checklist, and
sessionStorage-only note persistence. Dashboard and public index get
a new Case Workbench card. No existing tools, APIs, or prompts modified.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

includes/i18n.php

@@ -318,6 +318,121 @@ function dbnToolsT(string $key, ?string $language = null): string
     return (string)($all[$language][$key] ?? $all['en'][$key] ?? $key);
 }
 
+function dbnToolsWorkbenchCopy(?string $language = null): array
+{
+    $language = dbnToolsNormalizeUiLanguage($language ?? dbnToolsCurrentLanguage());
+    $copy = [
+        'en' => [
+            'title' => 'Case Workbench',
+            'label' => 'Case Workbench',
+            'sub' => 'Guided case flow',
+            'description' => 'Plan a case, map evidence, and open the right legal tools in sequence without storing documents.',
+            'badge' => 'Private session',
+            'kicker' => 'Guided preparation',
+            'hero_title' => 'One calm place to organise the next legal step.',
+            'hero_text' => 'Use this workbench to frame the case, decide which tool to open next, and keep a local evidence map while your documents stay in memory by default.',
+            'privacy_title' => 'Local notes only',
+            'privacy_text' => 'This page saves notes in browser sessionStorage. It does not upload files or call tool APIs.',
+            'clear_session' => 'Clear session',
+            'all_tools' => 'All tools',
+            'intake_title' => 'Case intake',
+            'evidence_title' => 'Evidence map',
+            'flow_title' => 'Recommended tool sequence',
+            'outputs_title' => 'Output checklist',
+            'role' => 'Who are you helping?',
+            'choose' => 'Choose...',
+            'role_parent' => 'Parent',
+            'role_family' => 'Family member',
+            'role_advocate' => 'Advocate or lawyer',
+            'role_supporter' => 'Supporter',
+            'case_type' => 'Case type',
+            'case_barnevernet' => 'Barnevernet / child welfare',
+            'case_custody' => 'Custody or residence',
+            'case_access' => 'Contact / samvær',
+            'case_echr' => 'ECHR / Strasbourg preparation',
+            'deadline' => 'Next deadline',
+            'language' => 'Working language',
+            'main_concern' => 'Main concern',
+            'main_concern_hint' => 'What decision, meeting, deadline, or document are you preparing for?',
+            'documents' => 'Documents',
+            'documents_hint' => 'List letters, decisions, reports, emails, or forms.',
+            'meetings' => 'Meetings and audio',
+            'meetings_hint' => 'List recordings, meeting notes, or conversations to transcribe.',
+            'dates' => 'Dates and deadlines',
+            'dates_hint' => 'List hearings, response deadlines, visits, decisions, and events.',
+            'claims' => 'Claims and facts',
+            'claims_hint' => 'List what the other side says, what you dispute, and what you can prove.',
+            'missing' => 'Missing proof',
+            'missing_hint' => 'List records, witnesses, messages, or sources still needed.',
+            'bring_redact' => 'Bring back: safe text you can share with helpers.',
+            'bring_transcribe' => 'Bring back: speaker notes, quotes, and follow-up issues.',
+            'bring_timeline' => 'Bring back: dated events and urgent deadlines.',
+            'bring_barnevernet' => 'Bring back: red flags, parties, and cited procedural issues.',
+            'bring_research' => 'Bring back: legal angles, source excerpts, and uncertainty notes.',
+            'bring_advocate' => 'Bring back: strongest brief sections and weak points.',
+            'bring_corpus' => 'Bring back: source titles, sections, and exact citation context.',
+            'open_tool' => 'Open tool',
+            'output_lawyer' => 'Lawyer handoff pack',
+            'output_barnevernet_response' => 'Barnevernet response preparation',
+            'output_meeting_prep' => 'Meeting preparation note',
+            'output_strasbourg' => 'Strasbourg / ECHR research prep',
+            'next_step' => 'Next practical step',
+            'next_step_hint' => 'Write the next action, owner, and deadline.',
+        ],
+        'no' => [
+            'title' => 'Saksarbeidsbenk',
+            'label' => 'Saksarbeidsbenk',
+            'sub' => 'Veiledet saksflyt',
+            'description' => 'Planlegg saken, kartlegg bevis og åpne riktig verktøy i riktig rekkefølge uten å lagre dokumenter.',
+            'badge' => 'Privat økt',
+            'kicker' => 'Veiledet forberedelse',
+            'hero_title' => 'Ett rolig sted for neste juridiske steg.',
+            'hero_text' => 'Bruk arbeidsbenken til å ramme inn saken, velge neste verktøy og holde et lokalt beviskart mens dokumenter behandles i minnet som standard.',
+            'privacy_title' => 'Kun lokale notater',
+            'privacy_text' => 'Denne siden lagrer notater i nettleserens sessionStorage. Den laster ikke opp filer og kaller ikke verktøy-API-er.',
+        ],
+        'uk' => [
+            'title' => 'Робочий простір справи',
+            'label' => 'Робочий простір справи',
+            'sub' => 'Керований шлях справи',
+            'description' => 'Плануйте справу, картуйте докази й відкривайте потрібні інструменти по черзі без збереження документів.',
+            'badge' => 'Приватна сесія',
+            'kicker' => 'Керована підготовка',
+            'hero_title' => 'Одне спокійне місце для наступного юридичного кроку.',
+            'hero_text' => 'Використовуйте цей простір, щоб описати справу, вибрати наступний інструмент і вести локальну карту доказів.',
+            'privacy_title' => 'Лише локальні нотатки',
+            'privacy_text' => 'Сторінка зберігає нотатки в sessionStorage браузера. Вона не завантажує файли і не викликає API інструментів.',
+        ],
+        'pl' => [
+            'title' => 'Panel pracy nad sprawą',
+            'label' => 'Panel pracy nad sprawą',
+            'sub' => 'Prowadzony tok sprawy',
+            'description' => 'Zaplanuj sprawę, uporządkuj dowody i otwieraj właściwe narzędzia po kolei bez zapisywania dokumentów.',
+            'badge' => 'Prywatna sesja',
+            'kicker' => 'Prowadzone przygotowanie',
+            'hero_title' => 'Jedno spokojne miejsce na kolejny krok prawny.',
+            'hero_text' => 'Użyj panelu, aby opisać sprawę, wybrać następne narzędzie i prowadzić lokalną mapę dowodów.',
+            'privacy_title' => 'Tylko lokalne notatki',
+            'privacy_text' => 'Strona zapisuje notatki w sessionStorage przeglądarki. Nie przesyła plików i nie wywołuje API narzędzi.',
+        ],
+    ];
+
+    return array_merge($copy['en'], $copy[$language] ?? []);
+}
+
+function dbnToolsWorkbenchMeta(?string $language = null): array
+{
+    $copy = dbnToolsWorkbenchCopy($language);
+    return [
+        'label' => $copy['label'],
+        'sub' => $copy['sub'],
+        'description' => $copy['description'],
+        'badge' => $copy['badge'],
+        'url' => 'workbench.php',
+        'icon' => 'WB',
+    ];
+}
+
 function dbnToolsLaunchedTools(?string $language = null): array
 {
     $language = dbnToolsNormalizeUiLanguage($language ?? dbnToolsCurrentLanguage());