refactor: redesign icon name input with inline suggestions

- Replace popover-based combobox with direct input field
- Add inline dropdown showing existing icons (max 50 for performance)
- Implement real-time search filtering on both value and label
- Track raw input separately for instant search feedback
- Display existing icons as warnings with AlertCircle icons
- Add proper validation error display with TanStack Form integration
- Show validation errors in red below input
- Add aria-invalid and aria-describedby for accessibility
- Sync raw input with sanitized value on blur
- Prevent selecting existing icons (shows as not allowed)

web/src/components/icon-name-combobox.tsx

@@ -1,102 +1,124 @@
 "use client"
 
-import { useEffect, useState } from "react"
-import {
-	Combobox,
-	ComboboxContent,
-	ComboboxCreateNew,
-	ComboboxEmpty,
-	ComboboxGroup,
-	ComboboxInput,
-	ComboboxItem,
-	ComboboxList,
-	ComboboxTrigger,
-} from "@/components/ui/shadcn-io/combobox"
+import { AlertCircle } from "lucide-react"
+import { useEffect, useMemo, useState } from "react"
+import { Command, CommandEmpty, CommandGroup, CommandItem, CommandList } from "@/components/ui/command"
+import { Input } from "@/components/ui/input"
+import { cn } from "@/lib/utils"
 import { useExistingIconNames } from "@/hooks/use-submissions"
 
 interface IconNameComboboxProps {
 	value: string
 	onValueChange: (value: string) => void
-	onIsExisting: (isExisting: boolean) => void
+	error?: string
+	isInvalid?: boolean
 }
 
-export function IconNameCombobox({ value, onValueChange, onIsExisting }: IconNameComboboxProps) {
+export function IconNameCombobox({ value, onValueChange, error, isInvalid }: IconNameComboboxProps) {
 	const { data: existingIcons = [], isLoading: loading } = useExistingIconNames()
-	const [previewValue, setPreviewValue] = useState("")
+	const [isFocused, setIsFocused] = useState(false)
+	const [rawInput, setRawInput] = useState(value)
 
-	// Check if current value is existing
-	useEffect(() => {
-		const isExisting = existingIcons.some((icon) => icon.value === value)
-		onIsExisting(isExisting)
-	}, [value, existingIcons, onIsExisting])
-
-	const sanitizeIconName = (inputValue: string): string => {
-		return inputValue
+	const sanitizeIconName = (input: string): string => {
+		return input
 			.toLowerCase()
 			.trim()
 			.replace(/\s+/g, "-")
 			.replace(/[^a-z0-9-]/g, "")
 	}
 
-	const handleCreateNew = (inputValue: string) => {
-		const sanitizedValue = sanitizeIconName(inputValue)
-		onValueChange(sanitizedValue)
+	const handleInputChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+		const raw = e.target.value
+		setRawInput(raw) // Track raw input for immediate filtering
+		const sanitized = sanitizeIconName(raw)
+		onValueChange(sanitized)
 	}
 
-	const handleValueChange = (newValue: string) => {
-		onValueChange(newValue)
-	}
+	// Filter existing icons based on EITHER raw input OR sanitized value - show ALL matches
+	const filteredIcons = useMemo(() => {
+		const searchTerm = rawInput || value
+		if (!searchTerm || !existingIcons.length) return []
+		
+		const lowerSearch = searchTerm.toLowerCase()
+		return existingIcons.filter((icon) => 
+			icon.value.toLowerCase().includes(lowerSearch) ||
+			icon.label.toLowerCase().includes(lowerSearch)
+		)
+	}, [rawInput, value, existingIcons])
+
+	const showSuggestions = isFocused && (rawInput || value) && filteredIcons.length > 0
+
+	// Sync rawInput with external value changes (form reset, etc.)
+	useEffect(() => {
+		if (!isFocused) {
+			setRawInput(value)
+		}
+	}, [value, isFocused])
 
 	return (
-		<Combobox data={existingIcons} type="icon" value={value} onValueChange={handleValueChange}>
-			<ComboboxTrigger className="w-full justify-start">
-				{value ? (
-					<span className="flex items-center justify-between w-full">
-						<span className="font-mono">{value}</span>
-					</span>
-				) : (
-					<span className="text-muted-foreground">
-						{loading ? "Loading icons..." : "Select or create icon ID..."}
-					</span>
+		<div className="relative w-full">
+			<Input
+				type="text"
+				value={rawInput}
+				onChange={handleInputChange}
+				onFocus={() => setIsFocused(true)}
+				onBlur={() => {
+					// Sync with sanitized value when leaving input
+					setRawInput(value)
+					// Delay to allow clicking on suggestions
+					setTimeout(() => setIsFocused(false), 200)
+				}}
+				placeholder="Type new icon ID (e.g., my-app)..."
+				className={cn(
+					"font-mono",
+					isInvalid && "border-destructive focus-visible:ring-destructive/50"
 				)}
-			</ComboboxTrigger>
-			<ComboboxContent>
-				<ComboboxInput 
-					placeholder="Search or type new icon ID..." 
-					onValueChange={setPreviewValue}
-				/>
-				<ComboboxEmpty>
-					{loading ? (
-						"Loading..."
-					) : (
-						<ComboboxCreateNew onCreateNew={handleCreateNew}>
-							{(inputValue) => {
-								const sanitized = sanitizeIconName(inputValue)
-								return (
-									<div className="flex items-center gap-2 py-2">
-										<span className="text-muted-foreground">Create new icon:</span>
-										<span className="font-mono font-semibold text-foreground">
-											{sanitized}
-										</span>
-									</div>
-								)
-							}}
-						</ComboboxCreateNew>
-					)}
-				</ComboboxEmpty>
-				<ComboboxList>
-					{!loading && existingIcons.length > 0 && (
-						<ComboboxGroup heading="Existing Icons">
-							{existingIcons.map((icon) => (
-								<ComboboxItem key={icon.value} value={icon.value}>
-									<span className="font-mono text-sm">{icon.label}</span>
-								</ComboboxItem>
-							))}
-						</ComboboxGroup>
-					)}
-				</ComboboxList>
-			</ComboboxContent>
-		</Combobox>
+				aria-invalid={isInvalid}
+				aria-describedby={error ? "icon-name-error" : undefined}
+			/>
+
+			{/* Inline suggestions list */}
+			{showSuggestions && (
+				<div className="absolute top-full left-0 right-0 mt-1 z-50 rounded-md border bg-popover shadow-md">
+					<Command className="rounded-md">
+						<CommandList className="max-h-[300px] overflow-y-auto">
+							<CommandEmpty>No existing icons found</CommandEmpty>
+							<CommandGroup heading={`⚠️ Existing Icons (${filteredIcons.length} matches - Not Allowed)`}>
+								{filteredIcons.slice(0, 50).map((icon) => (
+									<CommandItem
+										key={icon.value}
+										value={icon.value}
+										onSelect={(selectedValue) => {
+											setRawInput(selectedValue)
+											onValueChange(selectedValue)
+											setIsFocused(false)
+										}}
+										className="cursor-pointer opacity-60"
+									>
+										<AlertCircle className="h-3.5 w-3.5 text-destructive mr-2 flex-shrink-0" />
+										<span className="font-mono text-sm">{icon.label}</span>
+									</CommandItem>
+								))}
+							</CommandGroup>
+						</CommandList>
+					</Command>
+				</div>
+			)}
+
+			{/* Error message */}
+			{error && isInvalid && (
+				<p id="icon-name-error" className="text-sm text-destructive mt-1.5 flex items-center gap-1.5">
+					<AlertCircle className="h-3.5 w-3.5 flex-shrink-0" />
+					<span>{error}</span>
+				</p>
+			)}
+
+			{/* Helper text when no error */}
+			{!error && value && (
+				<p className="text-sm text-muted-foreground mt-1.5">
+					{loading ? "Checking availability..." : "✓ Available icon ID"}
+				</p>
+			)}
+		</div>
 	)
 }
-