feat(servers/settings): magic string invites, Navidrome admin share, and add-user validation (#258)

* feat(servers): magic string invites and duplicate-aware labels

Add psysonic1- share payloads (URL, Subsonic credentials, optional server
name). Login and add-server forms decode on input and keep magic field
below standard fields. Navidrome User Management generates strings after
PUT password updates where required. Resolve duplicate display names as
username@host in chrome, settings, and login.

* feat(servers): tighten magic-string import and admin share flow

After a decoded magic string, username is read-only and the password field
shows a fixed-length mask so length is not inferred. Password reveal stays
disabled until saved-server quick connect (login) or reopening the add-
server form. Navidrome admin share UI persists the password via API before
copy and adds a plaintext-handling disclaimer. Locales updated.

* feat(settings): save new Navidrome user and copy magic string

Add a non-admin "Save and get magic string" flow: create the user, assign
libraries when needed, then encode credentials to the clipboard. Reuse
the plaintext-handling disclaimer without the password-update hint meant
for edits. Strings added for all locales.

* fix(settings): tighten Navidrome add-user validation and submit feedback

Require username, display name, and a non-empty password (trimmed) for new
users; gate Save and “save and get magic string” on explicit checks with
toast feedback. Show red borders only after a failed submit, and clear
them when the user fills the fields. When editing, keep an empty password
as “unchanged” and validate identity fields with a dedicated message.
Strings: userMgmtValidationMissingIdentity across locales.

src/components/ConnectionIndicator.tsx

@@ -6,6 +6,7 @@ import { ConnectionStatus } from '../hooks/useConnectionStatus';
 import { useAuthStore, type ServerProfile } from '../store/authStore';
 import { switchActiveServer } from '../utils/switchActiveServer';
 import { showToast } from '../utils/toast';
+import { serverListDisplayLabel } from '../utils/serverDisplayName';
 
 interface Props {
   status: ConnectionStatus;
@@ -123,7 +124,7 @@ export default function ConnectionIndicator({ status, isLan, serverName }: Props
           {servers.map(srv => {
             const active = srv.id === activeServerId;
             const busy = switchingId !== null;
-            const labelText = (srv.name || srv.url).trim() || srv.url;
+            const labelText = serverListDisplayLabel(srv, servers);
             return (
               <button
                 key={srv.id}