feat: add sysfs serial fallback for RAID disks and responsive disk grid layout with improved styling

Add _device_serial() to read disk serials from /sys/class/block/{name}/device/serial and /sys/block/{name}/device/serial when lsblk cannot expose them in Docker containers. Update raid_status() to use sysfs fallback before defaulting to "—" for missing serials. Add .raid-disks 2-column grid with 6px gap, .raid-disk 7px/9px padding, .raid-disk small 1px top margin, and .raid-smart 85% opacity. Add mobile

templates/index.html

@@ -195,4 +195,4 @@ document.querySelectorAll('.service-logo img').forEach(img=>{img.style.width='20
 setInterval(()=>{document.querySelectorAll('.service-logo svg').forEach(svg=>{svg.style.width='19px';svg.style.height='19px';svg.style.fill='none';svg.style.stroke='currentColor';svg.style.strokeWidth='1.8';svg.style.strokeLinecap='round';svg.style.strokeLinejoin='round'});document.querySelectorAll('.service-logo img').forEach(img=>{img.style.width='20px';img.style.height='20px';img.style.objectFit='contain'})},500);
 const settingsBackdrop=document.querySelector('#settingsBackdrop');const closeSettings=()=>settingsBackdrop.classList.add('hidden');document.querySelector('#settingsOpen').addEventListener('click',()=>{loadPreferences();settingsBackdrop.classList.remove('hidden')});document.querySelector('#settingsClose').addEventListener('click',closeSettings);document.querySelector('#settingsCancel').addEventListener('click',closeSettings);settingsBackdrop.addEventListener('click',event=>{if(event.target===settingsBackdrop)closeSettings()});document.querySelector('#settingsSave').addEventListener('click',()=>{localStorage.setItem('preferred-audio',document.querySelector('#preferredAudio').value);localStorage.setItem('preferred-subs',document.querySelector('#preferredSubs').value);loadPreferences();closeSettings()});
 </script>
-<style>.nav-icon{width:15px;height:15px;margin-right:5px;vertical-align:-3px;object-fit:contain}.storage-icon img{width:20px;height:20px;object-fit:contain}</style>
+<style>.nav-icon{width:15px;height:15px;margin-right:5px;vertical-align:-3px;object-fit:contain}.storage-icon img{width:20px;height:20px;object-fit:contain}.raid-disks{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.raid-disk{padding:7px 9px}.raid-disk small{margin-top:1px}.raid-smart{opacity:.85}@media(max-width:700px){.raid-disks{grid-template-columns:1fr}}</style>