chore(eslint): add ESLint toolchain and clean src to strict 0/0 (#1165)

* chore(eslint): add eslint toolchain and configs

* fix(eslint): resolve gradual-config errors (rules-of-hooks, no-empty, prefer-const, …)

* chore(eslint): clear unused vars in config, contexts, app and test

* chore(eslint): clear unused vars in api and music-network

* chore(eslint): clear unused vars in utils

* chore(eslint): clear unused vars in store

* chore(eslint): clear unused vars in cover and hooks

* chore(eslint): clear unused vars in components

* chore(eslint): clear unused vars in pages

* chore(eslint): remove explicit any in src

* chore(eslint): align react-hooks exhaustive-deps

* chore(eslint): zero gradual config on src

* chore(eslint): strict hook rules in store and utils

* chore(eslint): strict hook rules in hooks and cover

* chore(eslint): strict hook rules in components

* chore(eslint): strict hook rules in pages and contexts

* chore(eslint): document scripts ignore in eslint config

* chore(eslint): add lint script and zero strict findings

* chore(eslint): address review round 1 (gradual 0/0, per-site disable reasons)

* chore(eslint): tighten two set-state disable comments (review round 2 LOW)

* chore(nix): sync npmDepsHash with package-lock.json

* docs(changelog): add Under the Hood entry for ESLint setup (PR #1165)

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

src/app/AppShell.tsx

@@ -2,7 +2,6 @@ import React, { Suspense, useCallback, useEffect, useRef, useState } from 'react
 import { useLocation, useNavigate } from 'react-router-dom';
 import { ensurePlaybackServerActive } from '../utils/playback/playbackServer';
 import { navigatePathWithAlbumReturnTo, shouldSkipMainScrollResetOnRouteChange } from '../utils/navigation/albumDetailNavigation';
-import { invoke } from '@tauri-apps/api/core';
 import { getCurrentWebview } from '@tauri-apps/api/webview';
 import { PanelRight } from 'lucide-react';
 import { useTranslation } from 'react-i18next';
@@ -113,7 +112,6 @@ export function AppShell() {
   const useCustomTitlebar = useAuthStore(s => s.useCustomTitlebar);
   const offlineCtx = useOfflineBrowseContext();
   const offlineNav = offlineBrowseNavFlags(offlineCtx.capabilities);
-  const hasOfflineContent = offlineCtx.hasBrowsingContent;
   const hasOfflineBrowse = offlineCtx.hasBrowseCapability;
   const floatingPlayerBar = useThemeStore(s => s.floatingPlayerBar);
   const perfFlags = usePerfProbeFlags();
@@ -218,7 +216,6 @@ export function AppShell() {
 
   const {
     queueWidth,
-    isDraggingQueue,
     setIsDraggingQueue,
     queueHandleTop,
     handleQueueHandleMouseDown,