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>

mcp.php

@@ -57,6 +57,7 @@ $toolIcons = [
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Crimson+Pro:wght@400;600;700&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap">
     <link rel="stylesheet" href="assets/css/tools.css">
+    <link rel="stylesheet" href="assets/css/dbn-tools-redesign.css">
     <style>
         /* ── MCP page styles ───────────────────────────────────────── */
         .mcp-hero {