fix(dashboard): hover infobulles, full-width layout, UX polish

- Fix doc tooltips: split CSS into <style type='text/tailwindcss'> for
  @apply directives + raw CSS for reliable doc panel rendering
- Convert doc panels from click-toggle to hover-based infobulles with
  arrow pointer, fade-in animation, and auto-dismiss on mobile
- Replace '?' icons with 'ⓘ' across all 11 templates (51 tooltips)
- Full-width layout: reduce padding on mobile (px-3), scale up on
  desktop (lg:px-5, xl:px-6) for maximum screen utilization
- Auto-collapse sidebar on narrow screens (<1024px)
- Keyboard shortcuts: Alt+1–9 for page navigation, Alt+B toggle sidebar
- Add LEGITIMATE_BROWSER filter button to detections page
- Sticky header with stronger blur (backdrop-blur-md)
- All 46 routes pass tests

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

services/dashboard/backend/templates/campaigns.html

@@ -74,7 +74,7 @@
                 <span class="section-title">
                     <svg class="w-4 h-4 text-purple-400" fill="none" stroke="currentColor" viewBox="0 0 24 24"><circle cx="12" cy="12" r="3"/><circle cx="5" cy="8" r="2"/><circle cx="19" cy="6" r="2"/><circle cx="7" cy="18" r="2"/><circle cx="18" cy="16" r="2.5"/></svg>
                     Carte des clusters
-                    <span class="relative inline-block"><button onclick="docToggle(this)" class="doc-btn">?</button><div class="doc-panel">
+                    <span class="relative inline-block"><button onclick="docToggle(this)" class="doc-btn">ⓘ</button><div class="doc-panel">
                         <h4>Scatter — Score vs Vélocité</h4>
                         <p>Chaque bulle = une IP. Position : score d'anomalie (X) vs vitesse de requêtes (Y).
                         Taille = nombre de hits. Couleur = campagne.</p>
@@ -96,7 +96,7 @@
                 <span class="section-title">
                     <svg class="w-4 h-4 text-cyan-400" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13.828 10.172a4 4 0 00-5.656 0l-4 4a4 4 0 105.656 5.656l1.102-1.101m-.758-4.899a4 4 0 005.656 0l4-4a4 4 0 00-5.656-5.656l-1.1 1.1"/></svg>
                     Graphe de liens
-                    <span class="relative inline-block"><button onclick="docToggle(this)" class="doc-btn">?</button><div class="doc-panel">
+                    <span class="relative inline-block"><button onclick="docToggle(this)" class="doc-btn">ⓘ</button><div class="doc-panel">
                         <h4>Graphe réseau inter-campagnes</h4>
                         <p>Nœuds = IPs anomales, Arêtes = JA4 partagé au sein d'une campagne.
                         Couleur du nœud = campagne. Taille = nombre de hits.</p>