[UI] Allow org members to navigate between the org and the dashboard

- add a new button to the org view that is only shown to the org members
- add integration test to verify the expected navigatability
- add a new translation string to that button
- fix display style of "View <orgname>" button on the dashboard
- fix gap size between buttons on the org view by utilizing the common class top-right-buttons

tests/integration/org_nav_test.go

@@ -0,0 +1,51 @@
+// Copyright 2024 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package integration
+
+import (
+	"net/http"
+	"testing"
+
+	"code.gitea.io/gitea/tests"
+)
+
+// This test makes sure that organization members are able to navigate between `/<orgname>` and `/org/<orgname>/<section>` freely.
+// The `/org/<orgname>/<section>` page is only accessible to the members of the organization. It doesn't have
+// a special logic to show the button or not.
+// The `/<orgname>` page utilizes the `IsOrganizationMember` function to show the button for navigation to
+// the organization dashboard. That function is covered by a test and is supposed to be true for the
+// owners/admins/members of the organization.
+func TestOrgNavigationDashboard(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	// Login as the future organization admin and create an organization
+	session1 := loginUser(t, "user2")
+	session1.MakeRequest(t, NewRequestWithValues(t, "POST", "/org/create", map[string]string{
+		"_csrf":                         GetCSRF(t, session1, "/org/create"),
+		"org_name":                      "org_navigation_test",
+		"visibility":                    "0",
+		"repo_admin_change_team_access": "on",
+	}), http.StatusSeeOther)
+
+	// Check if the "Open dashboard" button is available to the org admin (member)
+	resp := session1.MakeRequest(t, NewRequest(t, "GET", "/org_navigation_test"), http.StatusOK)
+	doc := NewHTMLParser(t, resp.Body)
+	doc.AssertElement(t, "#org-info a[href='/org/org_navigation_test/dashboard']", true)
+
+	// Check if the "View <orgname>" button is available on dashboard for the org admin (member)
+	resp = session1.MakeRequest(t, NewRequest(t, "GET", "/org/org_navigation_test/dashboard"), http.StatusOK)
+	doc = NewHTMLParser(t, resp.Body)
+	doc.AssertElement(t, ".dashboard .secondary-nav a[href='/org_navigation_test']", true)
+
+	// Login a non-member user
+	session2 := loginUser(t, "user4")
+
+	// Check if the "Open dashboard" button is available to non-member
+	resp = session2.MakeRequest(t, NewRequest(t, "GET", "/org_navigation_test"), http.StatusOK)
+	doc = NewHTMLParser(t, resp.Body)
+	doc.AssertElement(t, "#org-info a[href='/org/org_navigation_test/dashboard']", false)
+
+	// There's no need to test "View <orgname>" button on dashboard as non-member
+	// because this page is not supposed to be visitable for this user
+}