fix(server-switch): keep cached playback alive + Settings tab-id typo (#262)

* fix(server-switch): keep cached playback alive across servers

Drop the clearQueue() + initializeFromServerQueue() calls that were added
alongside the header server switcher (c75297fc). clearQueue() fires
audio_stop, killing the currently-playing (cached) track the moment the
user clicks a different server. Restore the pre-c75297fc behaviour: just
swap activeServerId, let the Rust audio engine keep streaming the
already-resolved URL, and let the next user action or the app-boot hook
pick up the new server's saved queue.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(settings): use renamed 'servers' tab id in paste-invite handler

Leftover from #261 landing on top of #259 — the Settings tab was renamed
from 'server' to 'servers' in #259, but the openAddServerInvite route-state
handler still used the old literal. Caused a TS error and meant pasting a
psysonic1- invite did not actually switch tabs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Psychotoxical <dev@psysonic.app>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/utils/switchActiveServer.ts

@@ -1,12 +1,7 @@
 import { pingWithCredentials, scheduleInstantMixProbeForServer } from '../api/subsonic';
 import type { ServerProfile } from '../store/authStore';
 import { useAuthStore } from '../store/authStore';
-import { usePlayerStore } from '../store/playerStore';
 
-/**
- * Ping, update server identity / Instant Mix probe, set active server, clear local playback
- * and pull the new server's saved play queue.
- */
 export async function switchActiveServer(server: ServerProfile): Promise<boolean> {
   try {
     const ping = await pingWithCredentials(server.url, server.username, server.password);
@@ -21,8 +16,6 @@ export async function switchActiveServer(server: ServerProfile): Promise<boolean
     scheduleInstantMixProbeForServer(server.id, server.url, server.username, server.password, identity);
     auth.setActiveServer(server.id);
     auth.setLoggedIn(true);
-    usePlayerStore.getState().clearQueue();
-    await usePlayerStore.getState().initializeFromServerQueue();
     return true;
   } catch {
     return false;