[MainUI] Add alphabetic index in items-list (settings - items) in mobile view

[Larsen-Locke]

On mobile phones there is no alphabetic index on the right page side in the items-list (settings - items). The other list views (settings - rules or things) have this index.

Here the items list without index.

Here the example of a things-list with the index

Your suggestion

Same index for all lists

Your environment

OH Technical Information

runtimeInfo:
version: 4.3.0.M4
buildString: Milestone Build
locale: en-DE
systemInfo:
configFolder: /etc/openhab
userdataFolder: /var/lib/openhab
logFolder: /var/log/openhab
javaVersion: 17.0.13
javaVendor: Debian
osName: Linux
osVersion: 6.6.20+rpt-rpi-2712
osArchitecture: aarch64
availableProcessors: 4
freeMemory: 152529664
totalMemory: 485490688
uptime: 520094
startLevel: 100
clientInfo:
device:
ios: false
android: true
androidChrome: true
desktop: false
iphone: false
ipod: false
ipad: false
edge: false
ie: false
firefox: false
macos: false
windows: false
cordova: false
phonegap: false
electron: false
nwjs: false
os: android
osVersion: "10"
webView: false
webview: false
standalone: false
pixelRatio: 2.75
prefersColorScheme: dark
isSecureContext: false
locationbarVisible: true
menubarVisible: true
navigator:
cookieEnabled: true
deviceMemory: N/A
hardwareConcurrency: 8
language: de-DE
languages:
- de-DE
- en-DE
- de
- en-US
- en
- ro
onLine: true
platform: Linux armv81
screen:
width: 393
height: 851
colorDepth: 24
support:
touch: true
pointerEvents: true
observer: true
passiveListener: true
gestures: false
intersectionObserver: true
themeOptions:
dark: dark
filled: true
pageTransitionAnimation: disabled
bars: light
homeNavbar: simple
homeBackground: default
expandableCardAnimation: disabled
blocklyRenderer: null
userAgent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like
Gecko) Chrome/131.0.0.0 Mobile Safari/537.36
timestamp: 2024-12-01T13:54:13.502Z