Fix overflow in commit graph

Limit commit message to 50% width. This is rather crude but should work
for common use cases with not too-long author names.

Fixes: go-gitea#17944

templates/repo/graph/commits.tmpl

@@ -28,7 +28,7 @@
 							{{- end -}}
 						</a>
 					</span>
-					<span class="message df ac mr-2">{{RenderCommitMessage $commit.Subject $.RepoLink $.Repository.ComposeMetas}}</span>
+					<span class="message dib ellipsis mr-2">{{RenderCommitMessage $commit.Subject $.RepoLink $.Repository.ComposeMetas}}</span>
 					<span class="tags df ac">
 						{{range $commit.Refs}}
 							{{$refGroup := .RefGroup}}

web_src/less/features/gitgraph.less

@@ -138,6 +138,10 @@
       width: auto;
       height: 18px;
     }
+
+    .message {
+      max-width: 50%;
+    }
   }
 
   #graph-raw-list {

web_src/less/helpers.less

@@ -28,6 +28,12 @@
   word-wrap: break-word !important;
 }
 
+.ellipsis {
+  overflow: hidden !important;
+  white-space: nowrap !important;
+  text-overflow: ellipsis !important;
+}
+
 .full-screen-width { width: 100vw !important; }
 .full-screen-height { height: 100vh !important; }