refactor(auth): E.44 — extract server-profile + lastfm + audio-settings factories (#609)

Three action-factories peel ~25 setters out of the authStore body,
following the playerStore action-factory pattern from Phase E:

- `createServerProfileActions` — `addServer`, `updateServer`,
  `removeServer` (the non-trivial one — drops every per-server map
  entry for the removed id), `setServers`, `setActiveServer`,
  `setLoggedIn`, `setConnecting`, `setConnectionError`, `logout`.
- `createAuthLastfmActions` — credentials + session connect/disconnect
  + error flag + master scrobbling toggle. Network calls (love /
  scrobble) stay in the playerStore-side `lastfmActions.ts`.
- `createAudioSettingsActions` — replay-gain / normalization /
  loudness mode toggles (each calls `usePlayerStore.getState()
  .updateReplayGainForCurrentTrack()` so a running track catches up),
  plus crossfade / gapless / hi-res / audio-output (no engine
  callback needed).

Pure code-move; no behaviour change. authStore.ts: 518 → 428 LOC (−90).

src/store/authAudioSettingsActions.ts

@@ -0,0 +1,74 @@
+import { clampStoredLoudnessPreAnalysisAttenuationRefDb } from '../utils/loudnessPreAnalysisSlider';
+import { DEFAULT_LOUDNESS_PRE_ANALYSIS_ATTENUATION_DB } from './authStoreDefaults';
+import { usePlayerStore } from './playerStore';
+import type { AuthState } from './authStoreTypes';
+
+type SetState = (
+  partial: Partial<AuthState> | ((state: AuthState) => Partial<AuthState>),
+) => void;
+
+/**
+ * Audio/playback settings. ReplayGain/normalization/loudness mode
+ * toggles call `usePlayerStore.getState().updateReplayGainForCurrentTrack()`
+ * so a running track's engine state catches up to the new mode without
+ * waiting for the next play. The plain crossfade/gapless/hi-res/output
+ * setters skip that — they don't change the gain state, only the
+ * neighbouring transitions or device routing.
+ */
+export function createAudioSettingsActions(set: SetState): Pick<
+  AuthState,
+  | 'setReplayGainEnabled'
+  | 'setNormalizationEngine'
+  | 'setLoudnessTargetLufs'
+  | 'setLoudnessPreAnalysisAttenuationDb'
+  | 'resetLoudnessPreAnalysisAttenuationDbDefault'
+  | 'setReplayGainMode'
+  | 'setReplayGainPreGainDb'
+  | 'setReplayGainFallbackDb'
+  | 'setCrossfadeEnabled'
+  | 'setCrossfadeSecs'
+  | 'setGaplessEnabled'
+  | 'setEnableHiRes'
+  | 'setAudioOutputDevice'
+> {
+  return {
+    setReplayGainEnabled: (v) => {
+      set({ replayGainEnabled: v });
+      usePlayerStore.getState().updateReplayGainForCurrentTrack();
+    },
+    setNormalizationEngine: (v) => {
+      set({ normalizationEngine: v });
+      usePlayerStore.getState().updateReplayGainForCurrentTrack();
+    },
+    setLoudnessTargetLufs: (v) => {
+      set({ loudnessTargetLufs: v });
+      usePlayerStore.getState().updateReplayGainForCurrentTrack();
+    },
+    setLoudnessPreAnalysisAttenuationDb: (v) => {
+      const n = typeof v === 'number' ? v : Number(v);
+      if (!Number.isFinite(n)) return;
+      set({ loudnessPreAnalysisAttenuationDb: clampStoredLoudnessPreAnalysisAttenuationRefDb(n) });
+    },
+    resetLoudnessPreAnalysisAttenuationDbDefault: () => {
+      set({ loudnessPreAnalysisAttenuationDb: DEFAULT_LOUDNESS_PRE_ANALYSIS_ATTENUATION_DB });
+      usePlayerStore.getState().updateReplayGainForCurrentTrack();
+    },
+    setReplayGainMode: (v) => {
+      set({ replayGainMode: v });
+      usePlayerStore.getState().updateReplayGainForCurrentTrack();
+    },
+    setReplayGainPreGainDb: (v) => {
+      set({ replayGainPreGainDb: v });
+      usePlayerStore.getState().updateReplayGainForCurrentTrack();
+    },
+    setReplayGainFallbackDb: (v) => {
+      set({ replayGainFallbackDb: v });
+      usePlayerStore.getState().updateReplayGainForCurrentTrack();
+    },
+    setCrossfadeEnabled: (v) => set({ crossfadeEnabled: v }),
+    setCrossfadeSecs: (v) => set({ crossfadeSecs: v }),
+    setGaplessEnabled: (v) => set({ gaplessEnabled: v }),
+    setEnableHiRes: (v) => set({ enableHiRes: v }),
+    setAudioOutputDevice: (v) => set({ audioOutputDevice: v }),
+  };
+}

src/store/authLastfmActions.ts

@@ -0,0 +1,35 @@
+import type { AuthState } from './authStoreTypes';
+
+type SetState = (
+  partial: Partial<AuthState> | ((state: AuthState) => Partial<AuthState>),
+) => void;
+
+/**
+ * Last.fm account settings on the auth side: credentials, session
+ * connect/disconnect, error flag, and the master scrobbling toggle.
+ * The actual scrobble/love network calls live in `lastfmActions.ts`
+ * inside the playerStore — these here only manage the persisted
+ * account state.
+ */
+export function createAuthLastfmActions(set: SetState): Pick<
+  AuthState,
+  | 'setLastfm'
+  | 'connectLastfm'
+  | 'disconnectLastfm'
+  | 'setLastfmSessionError'
+  | 'setScrobblingEnabled'
+> {
+  return {
+    setLastfm: (apiKey, apiSecret, sessionKey, username) =>
+      set({ lastfmApiKey: apiKey, lastfmApiSecret: apiSecret, lastfmSessionKey: sessionKey, lastfmUsername: username }),
+
+    connectLastfm: (sessionKey, username) =>
+      set({ lastfmSessionKey: sessionKey, lastfmUsername: username }),
+
+    disconnectLastfm: () =>
+      set({ lastfmSessionKey: '', lastfmUsername: '', lastfmSessionError: false }),
+
+    setLastfmSessionError: (v) => set({ lastfmSessionError: v }),
+    setScrobblingEnabled: (v) => set({ scrobblingEnabled: v }),
+  };
+}

src/store/authServerProfileActions.ts

@@ -0,0 +1,69 @@
+import type { AuthState } from './authStoreTypes';
+import { generateId } from './authStoreHelpers';
+
+type SetState = (
+  partial: Partial<AuthState> | ((state: AuthState) => Partial<AuthState>),
+) => void;
+
+/**
+ * Server profile + connection lifecycle. `removeServer` is the
+ * non-trivial one: when the active server is the one being removed it
+ * also drops every per-server map entry tied to that id and switches
+ * the active id to the next available server (or null) so the rest of
+ * the app doesn't end up reading stale state.
+ */
+export function createServerProfileActions(set: SetState): Pick<
+  AuthState,
+  | 'addServer'
+  | 'updateServer'
+  | 'removeServer'
+  | 'setServers'
+  | 'setActiveServer'
+  | 'setLoggedIn'
+  | 'setConnecting'
+  | 'setConnectionError'
+  | 'logout'
+> {
+  return {
+    addServer: (profile) => {
+      const id = generateId();
+      set(s => ({ servers: [...s.servers, { ...profile, id }] }));
+      return id;
+    },
+
+    updateServer: (id, data) => {
+      set(s => ({
+        servers: s.servers.map(srv => srv.id === id ? { ...srv, ...data } : srv),
+      }));
+    },
+
+    removeServer: (id) => {
+      set(s => {
+        const newServers = s.servers.filter(srv => srv.id !== id);
+        const switchedAway = s.activeServerId === id;
+        const { [id]: _r, ...entityRatingRest } = s.entityRatingSupportByServer;
+        const { [id]: _a, ...audiomuseRest } = s.audiomuseNavidromeByServer;
+        const { [id]: _idn, ...identityRest } = s.subsonicServerIdentityByServer;
+        const { [id]: _iss, ...issueRest } = s.audiomuseNavidromeIssueByServer;
+        const { [id]: _pr, ...probeRest } = s.instantMixProbeByServer;
+        return {
+          servers: newServers,
+          activeServerId: switchedAway ? (newServers[0]?.id ?? null) : s.activeServerId,
+          isLoggedIn: switchedAway ? false : s.isLoggedIn,
+          entityRatingSupportByServer: entityRatingRest,
+          audiomuseNavidromeByServer: audiomuseRest,
+          subsonicServerIdentityByServer: identityRest,
+          audiomuseNavidromeIssueByServer: issueRest,
+          instantMixProbeByServer: probeRest,
+        };
+      });
+    },
+
+    setServers: (servers) => set({ servers }),
+    setActiveServer: (id) => set({ activeServerId: id, musicFolders: [] }),
+    setLoggedIn: (v) => set({ isLoggedIn: v }),
+    setConnecting: (v) => set({ isConnecting: v }),
+    setConnectionError: (e) => set({ connectionError: e }),
+    logout: () => set({ isLoggedIn: false, musicFolders: [] }),
+  };
+}

src/store/authStore.ts

@@ -1,15 +1,16 @@
 import { create } from 'zustand';
 import { persist, createJSONStorage } from 'zustand/middleware';
-import { invoke } from '@tauri-apps/api/core';
 import {
   isNavidromeAudiomuseSoftwareEligible,
 } from '../utils/subsonicServerIdentity';
-import { usePlayerStore } from './playerStore';
 import { IS_LINUX } from '../utils/platform';
 import {
   LOUDNESS_PRE_ANALYSIS_REF_TARGET_LUFS,
   clampStoredLoudnessPreAnalysisAttenuationRefDb,
 } from '../utils/loudnessPreAnalysisSlider';
+import { createAudioSettingsActions } from './authAudioSettingsActions';
+import { createAuthLastfmActions } from './authLastfmActions';
+import { createServerProfileActions } from './authServerProfileActions';
 import {
   DEFAULT_LOUDNESS_PRE_ANALYSIS_ATTENUATION_DB,
   DEFAULT_LYRICS_SOURCES,
@@ -19,7 +20,6 @@ import {
   clampMixFilterMinStars,
   clampRandomMixSize,
   clampSkipStarThreshold,
-  generateId,
   sanitizeLoudnessLufsPreset,
   sanitizeLoudnessPreAnalysisFromStorage,
   sanitizeSkipStarCounts,
@@ -126,101 +126,15 @@ export const useAuthStore = create<AuthState>()(
       connectionError: null,
       lastfmSessionError: false,
 
-      addServer: (profile) => {
-        const id = generateId();
-        set(s => ({ servers: [...s.servers, { ...profile, id }] }));
-        return id;
-      },
+      ...createServerProfileActions(set),
+      ...createAuthLastfmActions(set),
+      ...createAudioSettingsActions(set),
 
-      updateServer: (id, data) => {
-        set(s => ({
-          servers: s.servers.map(srv => srv.id === id ? { ...srv, ...data } : srv),
-        }));
-      },
-
-      removeServer: (id) => {
-        set(s => {
-          const newServers = s.servers.filter(srv => srv.id !== id);
-          const switchedAway = s.activeServerId === id;
-          const { [id]: _r, ...entityRatingRest } = s.entityRatingSupportByServer;
-          const { [id]: _a, ...audiomuseRest } = s.audiomuseNavidromeByServer;
-          const { [id]: _idn, ...identityRest } = s.subsonicServerIdentityByServer;
-          const { [id]: _iss, ...issueRest } = s.audiomuseNavidromeIssueByServer;
-          const { [id]: _pr, ...probeRest } = s.instantMixProbeByServer;
-          return {
-            servers: newServers,
-            activeServerId: switchedAway ? (newServers[0]?.id ?? null) : s.activeServerId,
-            isLoggedIn: switchedAway ? false : s.isLoggedIn,
-            entityRatingSupportByServer: entityRatingRest,
-            audiomuseNavidromeByServer: audiomuseRest,
-            subsonicServerIdentityByServer: identityRest,
-            audiomuseNavidromeIssueByServer: issueRest,
-            instantMixProbeByServer: probeRest,
-          };
-        });
-      },
-
-      setServers: (servers) => set({ servers }),
-
-      setActiveServer: (id) => set({ activeServerId: id, musicFolders: [] }),
-
-      setLoggedIn: (v) => set({ isLoggedIn: v }),
-      setConnecting: (v) => set({ isConnecting: v }),
-      setConnectionError: (e) => set({ connectionError: e }),
-
-      setLastfm: (apiKey, apiSecret, sessionKey, username) =>
-        set({ lastfmApiKey: apiKey, lastfmApiSecret: apiSecret, lastfmSessionKey: sessionKey, lastfmUsername: username }),
-
-      connectLastfm: (sessionKey, username) =>
-        set({ lastfmSessionKey: sessionKey, lastfmUsername: username }),
-
-      disconnectLastfm: () =>
-        set({ lastfmSessionKey: '', lastfmUsername: '', lastfmSessionError: false }),
-
-      setLastfmSessionError: (v) => set({ lastfmSessionError: v }),
-
-      setScrobblingEnabled: (v) => set({ scrobblingEnabled: v }),
       setMaxCacheMb: (v) => set({ maxCacheMb: v }),
       setDownloadFolder: (v) => set({ downloadFolder: v }),
       setOfflineDownloadDir: (v) => set({ offlineDownloadDir: v }),
       setExcludeAudiobooks: (v) => set({ excludeAudiobooks: v }),
       setCustomGenreBlacklist: (v) => set({ customGenreBlacklist: v }),
-      setReplayGainEnabled: (v) => {
-        set({ replayGainEnabled: v });
-        usePlayerStore.getState().updateReplayGainForCurrentTrack();
-      },
-      setNormalizationEngine: (v) => {
-        set({ normalizationEngine: v });
-        usePlayerStore.getState().updateReplayGainForCurrentTrack();
-      },
-      setLoudnessTargetLufs: (v) => {
-        set({ loudnessTargetLufs: v });
-        usePlayerStore.getState().updateReplayGainForCurrentTrack();
-      },
-      setLoudnessPreAnalysisAttenuationDb: (v) => {
-        const n = typeof v === 'number' ? v : Number(v);
-        if (!Number.isFinite(n)) return;
-        set({ loudnessPreAnalysisAttenuationDb: clampStoredLoudnessPreAnalysisAttenuationRefDb(n) });
-      },
-      resetLoudnessPreAnalysisAttenuationDbDefault: () => {
-        set({ loudnessPreAnalysisAttenuationDb: DEFAULT_LOUDNESS_PRE_ANALYSIS_ATTENUATION_DB });
-        usePlayerStore.getState().updateReplayGainForCurrentTrack();
-      },
-      setReplayGainMode: (v) => {
-        set({ replayGainMode: v });
-        usePlayerStore.getState().updateReplayGainForCurrentTrack();
-      },
-      setReplayGainPreGainDb: (v) => {
-        set({ replayGainPreGainDb: v });
-        usePlayerStore.getState().updateReplayGainForCurrentTrack();
-      },
-      setReplayGainFallbackDb: (v) => {
-        set({ replayGainFallbackDb: v });
-        usePlayerStore.getState().updateReplayGainForCurrentTrack();
-      },
-      setCrossfadeEnabled: (v) => set({ crossfadeEnabled: v }),
-      setCrossfadeSecs: (v) => set({ crossfadeSecs: v }),
-      setGaplessEnabled: (v) => set({ gaplessEnabled: v }),
       setTrackPreviewsEnabled: (v) => set({ trackPreviewsEnabled: !!v }),
       setTrackPreviewLocation: (location, enabled) => set(state => ({
         trackPreviewLocations: { ...state.trackPreviewLocations, [location]: !!enabled },
@@ -261,8 +175,6 @@ export const useAuthStore = create<AuthState>()(
 
       setSeekbarStyle: (v) => set({ seekbarStyle: v }),
       setQueueNowPlayingCollapsed: (v: boolean) => set({ queueNowPlayingCollapsed: v }),
-      setEnableHiRes: (v) => set({ enableHiRes: v }),
-      setAudioOutputDevice: (v) => set({ audioOutputDevice: v }),
       setHotCacheEnabled: (v) => set({ hotCacheEnabled: v }),
       setHotCacheMaxMb: (v) => set({ hotCacheMaxMb: v }),
       setHotCacheDebounceSec: (v) => set({ hotCacheDebounceSec: v }),
@@ -391,8 +303,6 @@ export const useAuthStore = create<AuthState>()(
               })(),
         ),
 
-      logout: () => set({ isLoggedIn: false, musicFolders: [] }),
-
       getBaseUrl: () => {
         const s = get();
         const server = s.servers.find(srv => srv.id === s.activeServerId);