Fix 'View File' button in code search (#23478)

- Right-align 'View File' button
- Add 'role' attribute to button link

Before:
<img width="1148" alt="Screenshot 2023-03-14 at 22 02 16"
src="https://user-images.githubusercontent.com/115237/225135954-f06153ec-c222-441e-98ba-0177afff3a7a.png">

After:
<img width="1150" alt="Screenshot 2023-03-14 at 22 02 33"
src="https://user-images.githubusercontent.com/115237/225135966-323cb695-05ef-4b83-a8ef-05f2b1887090.png">

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

templates/code/searchresults.tmpl

@@ -11,15 +11,15 @@
 	{{range $result := .SearchResults}}
 		{{$repo := (index $.RepoMaps .RepoID)}}
 		<div class="diff-file-box diff-box file-content non-diff-file-content repo-search-result">
-			<h4 class="ui top attached normal header">
-				<span class="file">
+			<h4 class="ui top attached normal header gt-df gt-fw">
+				<span class="file gt-f1">
 					<a rel="nofollow" href="{{$repo.Link}}">{{$repo.FullName}}</a>
 						{{if $repo.IsArchived}}
 							<span class="ui basic label">{{$.locale.Tr "repo.desc.archived"}}</span>
 						{{end}}
 					- {{.Filename}}
 				</span>
-				<a class="ui basic tiny button" rel="nofollow" href="{{$repo.Link}}/src/commit/{{$result.CommitID | PathEscape}}/{{.Filename | PathEscapeSegments}}">{{$.locale.Tr "repo.diff.view_file"}}</a>
+				<a role="button" class="ui basic tiny button" rel="nofollow" href="{{$repo.Link}}/src/commit/{{$result.CommitID | PathEscape}}/{{.Filename | PathEscapeSegments}}">{{$.locale.Tr "repo.diff.view_file"}}</a>
 			</h4>
 			<div class="ui attached table segment">
 				<div class="file-body file-code code-view">

templates/repo/search.tmpl

@@ -39,9 +39,9 @@
 				<div class="repository search">
 					{{range $result := .SearchResults}}
 						<div class="diff-file-box diff-box file-content non-diff-file-content repo-search-result">
-							<h4 class="ui top attached normal header">
-								<span class="file">{{.Filename}}</span>
-								<a class="ui basic tiny button" rel="nofollow" href="{{$.SourcePath}}/src/commit/{{PathEscape $result.CommitID}}/{{PathEscapeSegments .Filename}}">{{$.locale.Tr "repo.diff.view_file"}}</a>
+							<h4 class="ui top attached normal header gt-df gt-fw">
+								<span class="file gt-f1">{{.Filename}}</span>
+								<a role="button" class="ui basic tiny button" rel="nofollow" href="{{$.SourcePath}}/src/commit/{{PathEscape $result.CommitID}}/{{PathEscapeSegments .Filename}}">{{$.locale.Tr "repo.diff.view_file"}}</a>
 							</h4>
 							<div class="ui attached table segment">
 								<div class="file-body file-code code-view">