fix: add missing bootstrap require in markdown-cheatsheet-fragment.php, add bottom padding to dialog

app/public/assets/css/tfe.css

@@ -52,6 +52,8 @@
     height: auto;
     display: block;
     border-radius: var(--radius);
+    user-select: none;
+    -webkit-user-drag: none;
 }
 
 .tfe-file-item embed,
@@ -161,12 +163,6 @@
     margin: 0;
 }
 
-/* PDF fallback download link */
-.tfe-pdf-fallback {
-    font-size: var(--step--1);
-    margin: var(--space-3xs) 0 0;
-}
-
 /* Audio player */
 .tfe-audio {
     width: 100%;
@@ -174,55 +170,6 @@
     display: block;
 }
 
-/* Download-only files */
-.tfe-download-file {
-    display: flex;
-    align-items: center;
-    gap: var(--space-xs);
-    padding: var(--space-s) var(--space-m);
-    background: var(--bg-secondary);
-    border: 1px solid var(--border-primary);
-    border-radius: var(--radius);
-    flex-wrap: wrap;
-}
-
-.tfe-download-link {
-    display: flex;
-    align-items: center;
-    gap: var(--space-xs);
-    font-size: var(--step--1);
-    font-weight: 500;
-    color: var(--text-primary);
-    text-decoration: none;
-    word-break: break-all;
-}
-
-.tfe-download-link:hover {
-    color: var(--accent-primary);
-    text-decoration: none;
-}
-
-.tfe-download-icon {
-    font-size: 1.3rem;
-    line-height: 1;
-    flex-shrink: 0;
-}
-
-.tfe-download-size {
-    font-size: var(--step--2);
-    color: var(--text-tertiary);
-    margin-left: auto;
-}
-
-.tfe-pdf-fallback a {
-    color: var(--text-primary);
-    text-decoration: none;
-}
-
-.tfe-pdf-fallback a:hover {
-    color: var(--accent-primary);
-}
-
 /* "Not available" and "no files" notices */
 .tfe-restricted,
 .tfe-no-files {