feat: add bug report issue template and report button on game grid

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

templates/homepage/index.html.twig

@@ -15,6 +15,17 @@
                 width: width,
                 middle: middle,
             }) }}></div>
+
+            <div class="game-footer">
+                <a href="https://git.lclr.dev/thibaud-lclr/ltbxd-actorle/issues/new?template=bug_report.yaml&title={{ ('Bug — Game #' ~ game.id)|url_encode }}" class="btn-bug-report" target="_blank" rel="noopener">
+                    <svg width="14" height="14" viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
+                        <circle cx="8" cy="8" r="7"/>
+                        <line x1="8" y1="5" x2="8" y2="9"/>
+                        <circle cx="8" cy="11.5" r="0.5" fill="currentColor" stroke="none"/>
+                    </svg>
+                    Signaler un bug
+                </a>
+            </div>
         </div>
     {% else %}
         <div class="game-start-container">