Apply Do Better Norge tools brand redesign (CSS + all tool pages)

New dbn-tools-redesign.css with warm paper surface, navy tools nav, gold
accent, and per-tool themes via body[data-active-tool]. Updated all 21 tool
PHP pages, shared layout/nav/footer includes, and advocate route (new).

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

includes/layout_footer.php

@@ -22,7 +22,7 @@
     </section><!-- /workspace -->
 </main><!-- /appShell -->
 <?php require_once __DIR__ . '/footer.php'; ?>
-<link rel="stylesheet" href="/assets/css/doc-picker.css">
+<link rel="stylesheet" href="assets/css/doc-picker.css">
 <?php
 // Expose current UI language + add-on i18n map for tools.js (legal-analysis add-on
 // can fire from any tool page, so it needs strings without depending on per-tool maps).
@@ -59,7 +59,7 @@ $_footerAddonI18n = [
 <script src="<?= htmlspecialchars((string)$extraScript) ?>" defer></script>
 <?php endforeach; endif; ?>
 <script src="assets/js/corpus-save.js" defer></script>
-<script src="/assets/js/doc-picker.js" defer></script>
+<script src="assets/js/doc-picker.js" defer></script>
 
 <!-- Doc picker modal (shared across all tool pages) -->
 <div id="docPickerBackdrop" class="doc-picker-backdrop" hidden role="dialog" aria-modal="true" aria-labelledby="docPickerTitle">