Add bio field and enhance smart assignment with bio matching

- Add bio field to User model for judge/mentor profile descriptions
- Add bio step to onboarding wizard (optional step with 500 char limit)
- Enhance smart assignment to match judge bio against project description
  - Uses keyword extraction and Jaccard-like similarity scoring
  - Only applies if judge has a bio (no penalty for empty bio)
  - Max 15 points for bio match on top of existing scoring
- Fix geographic distribution query to use round relation for programId
- Update score breakdown: tags (40), bio (15), workload (25), country (15)

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

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

@@ -25,6 +25,7 @@ import {
 import { toast } from 'sonner'
 import { ExpertiseSelect } from '@/components/shared/expertise-select'
 import { AvatarUpload } from '@/components/shared/avatar-upload'
+import { Textarea } from '@/components/ui/textarea'
 import {
   User,
   Phone,
@@ -36,9 +37,10 @@ import {
   ArrowLeft,
   Camera,
   Globe,
+  FileText,
 } from 'lucide-react'
 
-type Step = 'name' | 'photo' | 'country' | 'phone' | 'tags' | 'preferences' | 'complete'
+type Step = 'name' | 'photo' | 'country' | 'bio' | 'phone' | 'tags' | 'preferences' | 'complete'
 
 export default function OnboardingPage() {
   const router = useRouter()
@@ -48,6 +50,7 @@ export default function OnboardingPage() {
   // Form state
   const [name, setName] = useState('')
   const [country, setCountry] = useState('')
+  const [bio, setBio] = useState('')
   const [phoneNumber, setPhoneNumber] = useState('')
   const [expertiseTags, setExpertiseTags] = useState<string[]>([])
   const [lockedTags, setLockedTags] = useState<string[]>([])
@@ -70,6 +73,10 @@ export default function OnboardingPage() {
       if (userData.country) {
         setCountry(userData.country)
       }
+      // Pre-fill bio if available
+      if (userData.bio) {
+        setBio(userData.bio)
+      }
       // Pre-fill phone if available
       if (userData.phoneNumber) {
         setPhoneNumber(userData.phoneNumber)
@@ -96,10 +103,10 @@ export default function OnboardingPage() {
   // Dynamic steps based on WhatsApp availability
   const steps: Step[] = useMemo(() => {
     if (whatsappEnabled) {
-      return ['name', 'photo', 'country', 'phone', 'tags', 'preferences', 'complete']
+      return ['name', 'photo', 'country', 'bio', 'phone', 'tags', 'preferences', 'complete']
     }
     // Skip phone step if WhatsApp is disabled
-    return ['name', 'photo', 'country', 'tags', 'preferences', 'complete']
+    return ['name', 'photo', 'country', 'bio', 'tags', 'preferences', 'complete']
   }, [whatsappEnabled])
 
   const currentIndex = steps.indexOf(step)
@@ -128,6 +135,7 @@ export default function OnboardingPage() {
       await completeOnboarding.mutateAsync({
         name,
         country: country || undefined,
+        bio: bio || undefined,
         phoneNumber: phoneNumber || undefined,
         expertiseTags,
         notificationPreference,
@@ -302,7 +310,49 @@ export default function OnboardingPage() {
           </>
         )}
 
-        {/* Step 4: Phone (only if WhatsApp enabled) */}
+        {/* Step 4: Bio */}
+        {step === 'bio' && (
+          <>
+            <CardHeader>
+              <CardTitle className="flex items-center gap-2">
+                <FileText className="h-5 w-5 text-primary" />
+                About You
+              </CardTitle>
+              <CardDescription>
+                Tell us a bit about yourself and your expertise. This helps us match you with relevant projects. (Optional)
+              </CardDescription>
+            </CardHeader>
+            <CardContent className="space-y-4">
+              <div className="space-y-2">
+                <Label htmlFor="bio">Bio</Label>
+                <Textarea
+                  id="bio"
+                  value={bio}
+                  onChange={(e) => setBio(e.target.value)}
+                  placeholder="e.g., Marine biologist with 10 years experience in coral reef conservation and ocean acidification research..."
+                  rows={4}
+                  maxLength={500}
+                />
+                <p className="text-xs text-muted-foreground text-right">
+                  {bio.length}/500 characters
+                </p>
+              </div>
+
+              <div className="flex gap-2">
+                <Button variant="outline" onClick={goBack} className="flex-1">
+                  <ArrowLeft className="mr-2 h-4 w-4" />
+                  Back
+                </Button>
+                <Button onClick={goNext} className="flex-1">
+                  {bio ? 'Continue' : 'Skip for now'}
+                  <ArrowRight className="ml-2 h-4 w-4" />
+                </Button>
+              </div>
+            </CardContent>
+          </>
+        )}
+
+        {/* Step 5: Phone (only if WhatsApp enabled) */}
         {step === 'phone' && whatsappEnabled && (
           <>
             <CardHeader>
@@ -343,7 +393,7 @@ export default function OnboardingPage() {
           </>
         )}
 
-        {/* Step 5: Tags */}
+        {/* Step 6: Tags */}
         {step === 'tags' && (
           <>
             <CardHeader>
@@ -377,7 +427,7 @@ export default function OnboardingPage() {
           </>
         )}
 
-        {/* Step 6: Preferences */}
+        {/* Step 7: Preferences */}
         {step === 'preferences' && (
           <>
             <CardHeader>
@@ -434,6 +484,12 @@ export default function OnboardingPage() {
                       <span className="text-muted-foreground">Country:</span> {country}
                     </p>
                   )}
+                  {bio && (
+                    <p>
+                      <span className="text-muted-foreground">Bio:</span>{' '}
+                      {bio.length > 50 ? `${bio.substring(0, 50)}...` : bio}
+                    </p>
+                  )}
                   {whatsappEnabled && phoneNumber && (
                     <p>
                       <span className="text-muted-foreground">Phone:</span>{' '}