Improve the list header in milestone page (#27302)

The ui of list header in milestone page is not same as issue and pr list
page.
And they are using different template codes which can be merged into
one.

Before:

![image](https://github.com/go-gitea/gitea/assets/18380374/29eb426c-2dd6-4cf2-96e0-82339fb631bb)

![image](https://github.com/go-gitea/gitea/assets/18380374/b36c4dff-469a-4395-8a02-a8c54e17ab21)



![image](https://github.com/go-gitea/gitea/assets/18380374/d882c74a-451b-431d-b58e-3635a15d9718)

![image](https://github.com/go-gitea/gitea/assets/18380374/292cd38d-1b50-47f1-b32c-9b5de90ce5fb)


After:

![image](https://github.com/go-gitea/gitea/assets/18380374/4529234e-67dc-4e17-9440-e638be4fbc41)

![image](https://github.com/go-gitea/gitea/assets/18380374/c15b4d86-0762-497b-b28d-72d09443d629)

---------

Co-authored-by: puni9869 <80308335+puni9869@users.noreply.github.com>

routers/web/repo/issue.go

@@ -246,6 +246,8 @@ func issues(ctx *context.Context, milestoneID, projectID int64, isPullOption uti
 		isShowClosed = true
 	}
 
+	archived := ctx.FormBool("archived")
+
 	page := ctx.FormInt("page")
 	if page <= 1 {
 		page = 1
@@ -417,6 +419,15 @@ func issues(ctx *context.Context, milestoneID, projectID int64, isPullOption uti
 	ctx.Data["PinnedIssues"] = pinned
 	ctx.Data["IsRepoAdmin"] = ctx.IsSigned && (ctx.Repo.IsAdmin() || ctx.Doer.IsAdmin)
 	ctx.Data["IssueStats"] = issueStats
+	ctx.Data["OpenCount"] = issueStats.OpenCount
+	ctx.Data["ClosedCount"] = issueStats.ClosedCount
+	linkStr := "%s?q=%s&type=%s&sort=%s&state=%s&labels=%s&milestone=%d&project=%d&assignee=%d&poster=%d&archived=%t"
+	ctx.Data["OpenLink"] = fmt.Sprintf(linkStr, ctx.Link,
+		url.QueryEscape(keyword), url.QueryEscape(viewType), url.QueryEscape(sortType), "open", url.QueryEscape(selectLabels),
+		mentionedID, projectID, assigneeID, posterID, archived)
+	ctx.Data["ClosedLink"] = fmt.Sprintf(linkStr, ctx.Link,
+		url.QueryEscape(keyword), url.QueryEscape(viewType), url.QueryEscape(sortType), "closed", url.QueryEscape(selectLabels),
+		mentionedID, projectID, assigneeID, posterID, archived)
 	ctx.Data["SelLabelIDs"] = labelIDs
 	ctx.Data["SelectLabels"] = selectLabels
 	ctx.Data["ViewType"] = viewType
@@ -432,6 +443,7 @@ func issues(ctx *context.Context, milestoneID, projectID int64, isPullOption uti
 	} else {
 		ctx.Data["State"] = "open"
 	}
+	ctx.Data["ShowArchivedLabels"] = archived
 
 	pager.AddParam(ctx, "q", "Keyword")
 	pager.AddParam(ctx, "type", "ViewType")
@@ -442,11 +454,8 @@ func issues(ctx *context.Context, milestoneID, projectID int64, isPullOption uti
 	pager.AddParam(ctx, "project", "ProjectID")
 	pager.AddParam(ctx, "assignee", "AssigneeID")
 	pager.AddParam(ctx, "poster", "PosterID")
+	pager.AddParam(ctx, "archived", "ShowArchivedLabels")
 
-	if ctx.FormBool("archived") {
-		ctx.Data["ShowArchivedLabels"] = true
-		pager.AddParam(ctx, "archived", "ShowArchivedLabels")
-	}
 	ctx.Data["Page"] = pager
 }
 

routers/web/repo/milestone.go

@@ -4,6 +4,7 @@
 package repo
 
 import (
+	"fmt"
 	"net/http"
 	"net/url"
 	"time"
@@ -72,6 +73,11 @@ func Milestones(ctx *context.Context) {
 	}
 	ctx.Data["OpenCount"] = stats.OpenCount
 	ctx.Data["ClosedCount"] = stats.ClosedCount
+	linkStr := "%s/milestones?state=%s&q=%s&sort=%s"
+	ctx.Data["OpenLink"] = fmt.Sprintf(linkStr, ctx.Repo.RepoLink, "open",
+		url.QueryEscape(keyword), url.QueryEscape(sortType))
+	ctx.Data["ClosedLink"] = fmt.Sprintf(linkStr, ctx.Repo.RepoLink, "closed",
+		url.QueryEscape(keyword), url.QueryEscape(sortType))
 
 	if ctx.Repo.Repository.IsTimetrackerEnabled(ctx) {
 		if err := miles.LoadTotalTrackedTimes(ctx); err != nil {