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>

transcribe.php

@@ -112,7 +112,12 @@ $azureConfigured = !empty(dbnToolsEnv('DBN_AZURE_SPEECH_KEY'));
                     </details>
 
                     <!-- Hidden stubs so tools.js refs don't crash on this page -->
-                    <div class="is-hidden" id="languageControl" aria-hidden="true"><input type="radio" name="language" value="en" checked></div>
+                    <div class="is-hidden" id="languageControl" aria-hidden="true">
+                        <input type="radio" name="language" value="en" checked>
+                        <input type="radio" name="language" value="no">
+                        <input type="radio" name="language" value="uk">
+                        <input type="radio" name="language" value="pl">
+                    </div>
                     <div class="is-hidden" id="redactionControl" aria-hidden="true"></div>
                     <div class="is-hidden" id="uploadZone" aria-hidden="true">
                         <input type="file" id="uploadInput" style="display:none">