Refactor frontend tw-justify-between layouts to flex-left-right (#37291)

This PR standardizes left/right two-child frontend layouts on
`flex-left-right` and removes ad-hoc `tw-justify-between` combinations.
The goal is consistent wrapping + spacing behavior under narrow widths
with less utility-class churn.

Also: remove useless "flex-center-wrap", slightly improve some templates
(no visual change, tested)

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: wxiaoguang <2114189+wxiaoguang@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/user/notification/notification_subscriptions.tmpl

@@ -11,7 +11,7 @@
 		</div>
 		<div class="ui top attached segment">
 			{{if eq .Status 1}}
-				<div class="tw-flex tw-justify-between">
+				<div class="flex-left-right">
 					<div class="tw-flex">
 						<div class="small-menu-items ui compact tiny menu">
 							<a class="{{if eq .State "all"}}active {{end}}item" href="?sort={{$.SortType}}&state=all&issueType={{$.IssueType}}&labels={{$.Labels}}">
@@ -27,8 +27,7 @@
 							</a>
 						</div>
 					</div>
-					<div class="tw-flex tw-justify-between">
-						<div class="ui secondary filter menu labels">
+					<div class="ui secondary menu tw-m-0">
 							<!-- Type -->
 								<div class="ui dropdown type jump item">
 									<span class="text">
@@ -60,7 +59,6 @@
 								</div>
 							</div>
 						</div>
-					</div>
 				</div>
 				<div class="divider"></div>
 				{{if not .Issues}}