Make repository file list useable on mobile (go-gitea#19515)

* Make repository file list useable on mobile

- When you're browsing a repository on mobile, you're met by a giant
block called the "repository file list". The current design is not
useable for mobile and is a big annoyance while browsing a repo on
mobile. This PR removes that annoyance by making it more suitable design
when on mobile.
- Adds HTML for the commit/file time to align it vertically(noticeable
on mobile, not on PC).
- Show all information horizontally and not vertically.
- Remove the last commit message of the file, there isn't enough space
on mobile to place this anywhere, so we're not trying to make a
best-effort here and instead just not display it.

* Remove unnecessary `!important`

* Fix broken HTML

* Simplify code

web_src/less/_repository.less

@@ -3237,3 +3237,27 @@ td.blob-excerpt {
   transform: scale(105%);
   box-shadow: 0 .5rem 1rem var(--color-shadow) !important;
 }
+
+@media @mediaSm {
+  .repository.file.list {
+    #repo-files-table {
+      .entry,
+      .commit-list {
+        align-items: center;
+        display: flex !important;
+        padding-top: 4px;
+        padding-bottom: 4px;
+
+        td.age,
+        th.age {
+          margin-left: auto;
+        }
+
+        td.message,
+        span.commit-summary {
+          display: none !important;
+        }
+      }
+    }
+  }
+}