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/hooks/useConnectionStatus.ts

@@ -1,6 +1,7 @@
-import { useState, useEffect, useCallback, useRef } from 'react';
+import { useState, useEffect, useCallback, useRef, useMemo } from 'react';
 import { useAuthStore } from '../store/authStore';
 import { pingWithCredentials, scheduleInstantMixProbeForServer } from '../api/subsonic';
+import { serverListDisplayLabel } from '../utils/serverDisplayName';
 
 export type ConnectionStatus = 'connected' | 'disconnected' | 'checking';
 
@@ -77,12 +78,17 @@ export function useConnectionStatus() {
   }, [check]);
 
   const server = useAuthStore(s => s.getActiveServer());
+  const servers = useAuthStore(s => s.servers);
+  const serverName = useMemo(
+    () => (server ? serverListDisplayLabel(server, servers) : ''),
+    [server, servers],
+  );
 
   return {
     status,
     isRetrying,
     retry,
     isLan: server ? isLanUrl(server.url) : false,
-    serverName: server?.name ?? '',
+    serverName,
   };
 }