Fixed a lot of responsive problems.

- Fixed auth problem
- Fixed BBCode and Markdown apparition in some unnecessary parts

resources/css/components/common.css

@@ -43,6 +43,45 @@
     background-color: rgba(129, 199, 132, 0.1);
 }
 
+.back-to-top {
+    display: none;
+}
+
+@media (max-width: 768px) {
+    .back-to-top {
+        display: none;
+        align-items: center;
+        justify-content: center;
+        gap: 8px;
+        position: fixed;
+        right: 14px;
+        bottom: 14px;
+        z-index: 1000;
+        padding: 10px 14px;
+        border-radius: 999px;
+        background-color: var(--bg2);
+        border: 1px solid var(--border);
+        color: var(--text);
+        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
+        opacity: 0;
+        pointer-events: none;
+        transform: translateY(10px);
+        transition: opacity 0.2s ease, transform 0.2s ease;
+    }
+
+    .back-to-top.visible {
+        display: inline-flex;
+        opacity: 1;
+        pointer-events: auto;
+        transform: translateY(0);
+    }
+
+    .back-to-top span {
+        font-size: 0.78rem;
+        font-weight: 600;
+    }
+}
+
 /* BLOCK */
 
 .block {