Add ExpertiseSelect component for onboarding

Replace database-backed TagInput with a cleaner ExpertiseSelect
component that has predefined ocean conservation expertise areas.
Features a checkbox grid UI that's more user-friendly for onboarding.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/(auth)/onboarding/page.tsx

@@ -22,7 +22,7 @@ import {
   SelectValue,
 } from '@/components/ui/select'
 import { toast } from 'sonner'
-import { TagInput } from '@/components/shared/tag-input'
+import { ExpertiseSelect } from '@/components/shared/expertise-select'
 import {
   User,
   Phone,
@@ -202,15 +202,11 @@ export default function OnboardingPage() {
               </CardDescription>
             </CardHeader>
             <CardContent className="space-y-4">
-              <div className="space-y-2">
+              <ExpertiseSelect
-                <Label>Expertise Tags</Label>
+                value={expertiseTags}
-                <TagInput
+                onChange={setExpertiseTags}
-                  value={expertiseTags}
+                maxTags={5}
-                  onChange={setExpertiseTags}
+              />
-                  placeholder="Select your expertise areas..."
-                  maxTags={10}
-                />
-              </div>
 
               <div className="flex gap-2">
                 <Button variant="outline" onClick={goBack} className="flex-1">

src/components/shared/expertise-select.tsx

@@ -0,0 +1,149 @@
+'use client'
+
+import { useState } from 'react'
+import { Badge } from '@/components/ui/badge'
+import { Button } from '@/components/ui/button'
+import { cn } from '@/lib/utils'
+import { Check, X } from 'lucide-react'
+
+// Predefined expertise areas for ocean conservation
+const EXPERTISE_OPTIONS = [
+  { id: 'marine-biology', name: 'Marine Biology', color: '#0ea5e9' },
+  { id: 'ocean-conservation', name: 'Ocean Conservation', color: '#06b6d4' },
+  { id: 'climate-science', name: 'Climate Science', color: '#14b8a6' },
+  { id: 'sustainable-fishing', name: 'Sustainable Fishing', color: '#22c55e' },
+  { id: 'plastic-pollution', name: 'Plastic Pollution', color: '#84cc16' },
+  { id: 'coral-reef', name: 'Coral Reef Restoration', color: '#f97316' },
+  { id: 'blue-economy', name: 'Blue Economy', color: '#3b82f6' },
+  { id: 'marine-technology', name: 'Marine Technology', color: '#8b5cf6' },
+  { id: 'environmental-policy', name: 'Environmental Policy', color: '#a855f7' },
+  { id: 'oceanography', name: 'Oceanography', color: '#0284c7' },
+  { id: 'renewable-energy', name: 'Renewable Energy', color: '#16a34a' },
+  { id: 'waste-management', name: 'Waste Management', color: '#65a30d' },
+  { id: 'biodiversity', name: 'Biodiversity', color: '#059669' },
+  { id: 'shipping-maritime', name: 'Shipping & Maritime', color: '#6366f1' },
+  { id: 'education-outreach', name: 'Education & Outreach', color: '#ec4899' },
+  { id: 'entrepreneurship', name: 'Entrepreneurship', color: '#f43f5e' },
+  { id: 'investment-finance', name: 'Investment & Finance', color: '#eab308' },
+  { id: 'research-academia', name: 'Research & Academia', color: '#7c3aed' },
+]
+
+interface ExpertiseSelectProps {
+  value: string[]
+  onChange: (tags: string[]) => void
+  maxTags?: number
+  disabled?: boolean
+  className?: string
+}
+
+export function ExpertiseSelect({
+  value,
+  onChange,
+  maxTags = 10,
+  disabled = false,
+  className,
+}: ExpertiseSelectProps) {
+  const handleToggle = (name: string) => {
+    if (disabled) return
+
+    if (value.includes(name)) {
+      onChange(value.filter((t) => t !== name))
+    } else {
+      if (maxTags && value.length >= maxTags) return
+      onChange([...value, name])
+    }
+  }
+
+  const handleRemove = (name: string) => {
+    if (disabled) return
+    onChange(value.filter((t) => t !== name))
+  }
+
+  const getOption = (name: string) =>
+    EXPERTISE_OPTIONS.find((o) => o.name === name)
+
+  return (
+    <div className={cn('space-y-4', className)}>
+      {/* Selected tags at the top */}
+      {value.length > 0 && (
+        <div className="flex flex-wrap gap-2">
+          {value.map((name) => {
+            const option = getOption(name)
+            return (
+              <Badge
+                key={name}
+                variant="secondary"
+                className="gap-1.5 py-1 px-2 text-sm"
+                style={{
+                  backgroundColor: option?.color ? `${option.color}15` : undefined,
+                  borderColor: option?.color || undefined,
+                  color: option?.color || undefined,
+                }}
+              >
+                {name}
+                {!disabled && (
+                  <button
+                    type="button"
+                    onClick={() => handleRemove(name)}
+                    className="ml-0.5 rounded-full p-0.5 hover:bg-black/10 transition-colors"
+                    aria-label={`Remove ${name}`}
+                  >
+                    <X className="h-3 w-3" />
+                  </button>
+                )}
+              </Badge>
+            )
+          })}
+        </div>
+      )}
+
+      {/* Grid of options */}
+      <div className="grid grid-cols-2 gap-2">
+        {EXPERTISE_OPTIONS.map((option) => {
+          const isSelected = value.includes(option.name)
+          const isDisabled = disabled || (!isSelected && value.length >= maxTags)
+
+          return (
+            <Button
+              key={option.id}
+              type="button"
+              variant="outline"
+              size="sm"
+              disabled={isDisabled}
+              onClick={() => handleToggle(option.name)}
+              className={cn(
+                'justify-start h-auto py-2 px-3 text-left font-normal transition-all',
+                isSelected && 'ring-2 ring-offset-1',
+                isDisabled && !isSelected && 'opacity-50'
+              )}
+              style={{
+                borderColor: isSelected ? option.color : undefined,
+                ringColor: option.color,
+                backgroundColor: isSelected ? `${option.color}10` : undefined,
+              }}
+            >
+              <div
+                className={cn(
+                  'h-4 w-4 rounded border-2 mr-2 flex items-center justify-center transition-colors',
+                  isSelected ? 'border-current bg-current' : 'border-muted-foreground/30'
+                )}
+                style={{
+                  borderColor: isSelected ? option.color : undefined,
+                  backgroundColor: isSelected ? option.color : undefined,
+                }}
+              >
+                {isSelected && <Check className="h-3 w-3 text-white" />}
+              </div>
+              <span className="text-sm">{option.name}</span>
+            </Button>
+          )
+        })}
+      </div>
+
+      {/* Counter */}
+      <p className="text-xs text-muted-foreground text-center">
+        {value.length} of {maxTags} selected
+      </p>
+    </div>
+  )
+}