Change project default column icon to 'star' (#35967)

Consistently use a `star` icon to highlight the default column of a
project.
The icon is both shown while viewing the project, as well as while
changing the default status of this column.

<img width="1065" height="370" alt="image"
src="https://github.com/user-attachments/assets/1ca5773d-8eec-4b90-ad0b-22b1f4bd4cfd"
/>

options/locale/locale_en-US.ini

@@ -1481,6 +1481,7 @@ projects.column.new_submit = "Create Column"
 projects.column.new = "New Column"
 projects.column.set_default = "Set Default"
 projects.column.set_default_desc = "Set this column as default for uncategorized issues and pulls"
+projects.column.default_column_hint = "New issues added to this project will be added to this column"
 projects.column.delete = "Delete Column"
 projects.column.deletion_desc = "Deleting a project column moves all related issues to the default column. Continue?"
 projects.column.color = "Color"

templates/projects/view.tmpl

@@ -78,7 +78,9 @@
 					<div class="ui circular label project-column-issue-count">
 						{{.NumIssues}}
 					</div>
-					<div class="project-column-title-text gt-ellipsis">{{.Title}}</div>
+					<div class="project-column-title-text flex-text-inline gt-ellipsis" {{if .Default}}data-tooltip-content="{{ctx.Locale.Tr "repo.projects.column.default_column_hint"}}"{{end}}>
+						{{if .Default}}{{svg "octicon-star"}} {{end}}{{.Title}}
+					</div>
 					{{if $canWriteProject}}
 						<div class="ui dropdown tw-p-1">
 							{{svg "octicon-kebab-horizontal"}}
@@ -98,7 +100,7 @@
 										data-modal-confirm-header="{{ctx.Locale.Tr "repo.projects.column.set_default"}}"
 										data-modal-confirm-content="{{ctx.Locale.Tr "repo.projects.column.set_default_desc"}}"
 									>
-										{{svg "octicon-pin"}} {{ctx.Locale.Tr "repo.projects.column.set_default"}}
+										{{svg "octicon-star"}} {{ctx.Locale.Tr "repo.projects.column.set_default"}}
 									</a>
 									<a class="item button link-action" data-url="{{$.Link}}/{{.ID}}" data-link-action-method="DELETE"
 										data-modal-confirm-header="{{ctx.Locale.Tr "repo.projects.column.delete"}}"