Improve Mobile UI for dialogs and action dropdowns (#16222)

* fix: Always show conversation item actions

* feat: Improve Alert Dialog and Dialog mobile UI

* feat: Add settings reset to default confirmation

* fix: Close Edit dialog on save

* chore: update webui build output

* webui: implement proper z-index system and scroll management

- Add CSS variable for centralized z-index control
- Fix dropdown positioning with Settings dialog conflicts
- Prevent external scroll interference with proper event handling
- Clean up hardcoded z-index values for maintainable architecture

* webui: ensured the settings dialog enforces dynamic viewport height on mobile while retaining existing desktop sizing overrides

* feat: Use `dvh` instead of computed px height for dialogs max height on mobile

* chore: update webui build output

* feat: Improve Settings fields UI

* chore: update webui build output

* chore: update webui build output

---------

Co-authored-by: Pascal <admin@serveurperso.com>

tools/server/webui/src/lib/components/ui/select/select-content.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+	import { onDestroy, onMount } from 'svelte';
 	import { Select as SelectPrimitive } from 'bits-ui';
 	import SelectScrollUpButton from './select-scroll-up-button.svelte';
 	import SelectScrollDownButton from './select-scroll-down-button.svelte';
@@ -14,6 +15,76 @@
 	}: WithoutChild<SelectPrimitive.ContentProps> & {
 		portalProps?: SelectPrimitive.PortalProps;
 	} = $props();
+
+	let cleanupInternalListeners: (() => void) | undefined;
+
+	onMount(() => {
+		const listenerOptions: AddEventListenerOptions = { passive: false };
+
+		const blockOutsideWheel = (event: WheelEvent) => {
+			if (!ref) {
+				return;
+			}
+
+			const target = event.target as Node | null;
+
+			if (!target || !ref.contains(target)) {
+				event.preventDefault();
+				event.stopPropagation();
+			}
+		};
+
+		const blockOutsideTouchMove = (event: TouchEvent) => {
+			if (!ref) {
+				return;
+			}
+
+			const target = event.target as Node | null;
+
+			if (!target || !ref.contains(target)) {
+				event.preventDefault();
+				event.stopPropagation();
+			}
+		};
+
+		document.addEventListener('wheel', blockOutsideWheel, listenerOptions);
+		document.addEventListener('touchmove', blockOutsideTouchMove, listenerOptions);
+
+		return () => {
+			document.removeEventListener('wheel', blockOutsideWheel, listenerOptions);
+			document.removeEventListener('touchmove', blockOutsideTouchMove, listenerOptions);
+		};
+	});
+
+	$effect(() => {
+		const element = ref;
+
+		cleanupInternalListeners?.();
+
+		if (!element) {
+			return;
+		}
+
+		const stopWheelPropagation = (event: WheelEvent) => {
+			event.stopPropagation();
+		};
+
+		const stopTouchPropagation = (event: TouchEvent) => {
+			event.stopPropagation();
+		};
+
+		element.addEventListener('wheel', stopWheelPropagation);
+		element.addEventListener('touchmove', stopTouchPropagation);
+
+		cleanupInternalListeners = () => {
+			element.removeEventListener('wheel', stopWheelPropagation);
+			element.removeEventListener('touchmove', stopTouchPropagation);
+		};
+	});
+
+	onDestroy(() => {
+		cleanupInternalListeners?.();
+	});
 </script>
 
 <SelectPrimitive.Portal {...portalProps}>
@@ -22,7 +93,7 @@
 		{sideOffset}
 		data-slot="select-content"
 		class={cn(
-			'relative z-50 max-h-(--bits-select-content-available-height) min-w-[8rem] origin-(--bits-select-content-transform-origin) overflow-x-hidden overflow-y-auto rounded-md border bg-popover text-popover-foreground shadow-md data-[side=bottom]:translate-y-1 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:-translate-x-1 data-[side=left]:slide-in-from-right-2 data-[side=right]:translate-x-1 data-[side=right]:slide-in-from-left-2 data-[side=top]:-translate-y-1 data-[side=top]:slide-in-from-bottom-2 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[state=open]:animate-in data-[state=open]:fade-in-0 data-[state=open]:zoom-in-95',
+			'relative z-[var(--layer-popover,1000000)] max-h-(--bits-select-content-available-height) min-w-[8rem] origin-(--bits-select-content-transform-origin) overflow-x-hidden overflow-y-auto rounded-md border bg-popover text-popover-foreground shadow-md data-[side=bottom]:translate-y-1 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:-translate-x-1 data-[side=left]:slide-in-from-right-2 data-[side=right]:translate-x-1 data-[side=right]:slide-in-from-left-2 data-[side=top]:-translate-y-1 data-[side=top]:slide-in-from-bottom-2 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[state=open]:animate-in data-[state=open]:fade-in-0 data-[state=open]:zoom-in-95',
 			className
 		)}
 		{...restProps}