Release v1.3.0: Multi-source downloads, audio analyzer resilience, mobile improvements

Major Features:
- Multi-source download system (Soulseek/Lidarr with fallback)
- Configurable enrichment speed control (1-5x)
- Mobile touch drag support for seek sliders
- iOS PWA media controls (Control Center, Lock Screen)
- Artist name alias resolution via Last.fm
- Circuit breaker pattern for audio analysis

Critical Fixes:
- Audio analyzer stability (non-ASCII, BrokenProcessPool, OOM)
- Discovery system race conditions and import failures
- Radio decade categorization using originalYear
- LastFM API response normalization
- Mood bucket infinite loop prevention

Security:
- Bull Board admin authentication
- Lidarr webhook signature verification
- JWT token expiration and refresh
- Encryption key validation on startup

Closes #2, #6, #9, #13, #21, #26, #31, #34, #35, #37, #40, #43

frontend/components/layout/MobileSidebar.tsx

@@ -72,6 +72,7 @@ export function MobileSidebar({ isOpen, onClose }: MobileSidebarProps) {
             <div
                 className="fixed inset-0 bg-black/60  z-50 transition-opacity"
                 onClick={onClose}
+                aria-hidden="true"
             />
 
             {/* Sidebar Drawer */}
@@ -109,7 +110,7 @@ export function MobileSidebar({ isOpen, onClose }: MobileSidebarProps) {
                 </div>
 
                 {/* Menu Content */}
-                <nav className="flex-1 overflow-y-auto py-4">
+                <nav className="flex-1 overflow-y-auto py-4" role="navigation" aria-label="Mobile menu">
                     {/* Quick Links Section */}
                     <div className="px-3 mb-6">
                         <div className="text-[10px] font-semibold text-gray-600 uppercase tracking-widest px-3 mb-2">
@@ -118,6 +119,8 @@ export function MobileSidebar({ isOpen, onClose }: MobileSidebarProps) {
 
                         <Link
                             href="/discover"
+                            aria-current={pathname === "/discover" ? "page" : undefined}
+                            aria-label="Discover"
                             className={cn(
                                 "flex items-center gap-3 px-3 py-3 rounded-lg transition-colors",
                                 pathname === "/discover"
@@ -133,6 +136,8 @@ export function MobileSidebar({ isOpen, onClose }: MobileSidebarProps) {
 
                         <Link
                             href="/radio"
+                            aria-current={pathname === "/radio" ? "page" : undefined}
+                            aria-label="Radio"
                             className={cn(
                                 "flex items-center gap-3 px-3 py-3 rounded-lg transition-colors",
                                 pathname === "/radio"
@@ -148,6 +153,8 @@ export function MobileSidebar({ isOpen, onClose }: MobileSidebarProps) {
 
                         <Link
                             href="/releases"
+                            aria-current={pathname === "/releases" ? "page" : undefined}
+                            aria-label="Releases"
                             className={cn(
                                 "flex items-center gap-3 px-3 py-3 rounded-lg transition-colors",
                                 pathname === "/releases"
@@ -191,6 +198,7 @@ export function MobileSidebar({ isOpen, onClose }: MobileSidebarProps) {
 
                         <Link
                             href="/settings"
+                            aria-current={pathname === "/settings" ? "page" : undefined}
                             className={cn(
                                 "flex items-center gap-3 px-3 py-3 rounded-lg transition-colors",
                                 pathname === "/settings"