[feature] Admin accounts endpoints; approve/reject sign-ups (#2826)

* update settings panels, add pending overview + approve/deny functions

* add admin accounts get, approve, reject

* send approved/rejected emails

* use signup URL

* docs!

* email

* swagger

* web linting

* fix email tests

* wee lil fixerinos

* use new paging logic for GetAccounts() series of admin endpoints, small changes to query building

* shuffle useAccountIDIn check *before* adding to query

* fix parse from toot react error

* use `netip.Addr`

* put valid slices in globals

* optimistic updates for account state

---------

Co-authored-by: kim <grufwub@gmail.com>

internal/email/noopsender.go

@@ -72,6 +72,14 @@ func (s *noopSender) SendNewSignupEmail(toAddresses []string, data NewSignupData
 	return s.sendTemplate(newSignupTemplate, newSignupSubject, data, toAddresses...)
 }
 
+func (s *noopSender) SendSignupApprovedEmail(toAddress string, data SignupApprovedData) error {
+	return s.sendTemplate(signupApprovedTemplate, signupApprovedSubject, data, toAddress)
+}
+
+func (s *noopSender) SendSignupRejectedEmail(toAddress string, data SignupRejectedData) error {
+	return s.sendTemplate(signupRejectedTemplate, signupRejectedSubject, data, toAddress)
+}
+
 func (s *noopSender) sendTemplate(template string, subject string, data any, toAddresses ...string) error {
 	buf := &bytes.Buffer{}
 	if err := s.template.ExecuteTemplate(buf, template, data); err != nil {