feat: Legal Tools v1 — multilingual landing, dashboard, SSO bridge

- Public landing page at / for unauthenticated users (EN/NO/UK/PL)
- Authenticated / shows Case Workbench dashboard with manifesto strip,
  stats, and launched-tool grid (Transcribe, Timeline, BVJ, Advocate,
  Deep Research, Corpus)
- Added includes/i18n.php with full 4-language translation layer
- Extended layout.php to Case Workbench shell with tool rail, lang switcher
- AI output language normalization extended to en/no/uk/pl in PHP agents
- SSO token validation in bootstrap.php / index.php (dobetternorge.no bridge)

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

includes/layout_footer.php

@@ -5,15 +5,15 @@
 <?= $reasoningPanelOverride ?>
 <?php else: ?>
             <div class="reasoning-head">
-                <p class="eyebrow">Evidence trail</p>
-                <h2 id="reasoningTitle">Reasoning</h2>
+                <p class="eyebrow"><?= htmlspecialchars(dbnToolsT('reasoning_eyebrow', $uiLang ?? dbnToolsCurrentLanguage())) ?></p>
+                <h2 id="reasoningTitle"><?= htmlspecialchars(dbnToolsT('reasoning_title', $uiLang ?? dbnToolsCurrentLanguage())) ?></h2>
             </div>
             <ol id="traceList" class="trace-list">
                 <li>
                     <span class="trace-status waiting"></span>
                     <div>
-                        <strong>Waiting</strong>
-                        <p>Run a tool to see interpretation, retrieval, confidence, uncertainty, and next step.</p>
+                        <strong><?= htmlspecialchars(dbnToolsT('waiting_title', $uiLang ?? dbnToolsCurrentLanguage())) ?></strong>
+                        <p><?= htmlspecialchars(dbnToolsT('waiting_text', $uiLang ?? dbnToolsCurrentLanguage())) ?></p>
                     </div>
                 </li>
             </ol>