Add Transcribe docs (about/guide/tech) + refresh Redact docs

- New: transcribe-about.php, transcribe-guide.php, transcribe-tech.php
  with full en/no/uk/pl translations (3-engine cascade, diarization, vocab)
- New: translations/transcribe-about|guide|tech.php (4-lang strings)
- New: scripts/translate-pages.php (Azure gpt-4o CLI translation helper)
- Add korr-doc-links nav to transcribe.php
- Refresh redact-about|guide|tech.php — point to assets/images/redact/
- Fix all "never written to disk" wording in redact translations
- Add Min Sak/corpus save workflow to redact guide and tech privacy section
- redact.php upload hint: correct in-memory wording

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

redact.php

@@ -105,7 +105,7 @@ require_once __DIR__ . '/includes/layout.php';
                         <div id="uploadPrompt" class="upload-prompt">
                             <span class="upload-icon" aria-hidden="true">&#8679;</span>
                             <p><span data-i18n="redactUploadDrop">Drop one file here, or</span> <label for="uploadInput" class="upload-browse" data-i18n="redactUploadBrowse">browse</label></p>
-                            <p class="upload-hint"><strong>PDF</strong>, <strong>DOCX</strong>, <strong>TXT</strong> &mdash; <span data-i18n="redactUploadHint">text extracted in memory, never stored</span></p>
+                            <p class="upload-hint"><strong>PDF</strong>, <strong>DOCX</strong>, <strong>TXT</strong> &mdash; <span data-i18n="redactUploadHint">processed in memory — save results to Min Sak or download</span></p>
                         </div>
                         <div id="uploadFileInfo" class="upload-file is-hidden">
                             <ul id="uploadFileList" class="upload-file-list"></ul>