Fix file path width in repo non-homepage view (#30951) (#30952)

Backport #30951 by @silverwind

Fixes: https://github.com/go-gitea/gitea/issues/30940

<img width="1310" alt="Screenshot 2024-05-11 at 20 48 41"
src="https://github.com/go-gitea/gitea/assets/115237/f163dfd4-1299-421f-a99e-cd0c793e0e3d">

Co-authored-by: silverwind <me@silverwind.io>

templates/repo/home.tmpl

@@ -45,7 +45,7 @@
 		{{$n := len .TreeNames}}
 		{{$l := Eval $n "-" 1}}
 		{{$isHomepage := (eq $n 0)}}
-		<div class="repo-button-row">
+		<div class="repo-button-row" data-is-homepage="{{$isHomepage}}">
 			<div class="repo-button-row-left">
 				{{template "repo/branch_dropdown" dict "root" . "ContainerClasses" "tw-mr-1"}}
 				{{if and .CanCompareOrPull .IsViewBranch (not .Repository.IsArchived)}}

web_src/css/repo.css

@@ -2256,6 +2256,10 @@ td .commit-summary {
   justify-content: flex-end;
 }
 
+.repo-button-row[data-is-homepage="false"] .repo-button-row-right {
+  flex-grow: 0;
+}
+
 @media (max-width: 991px) {
   .repository:not(.wiki) .repo-button-row {
     flex-direction: column;