feat: complete person identity matching system with fuzzy detection, revert, and manual link

Implements the full identity matching engine: email matching (HIGH confidence),
fuzzy name matching with Levenshtein distance (MEDIUM confidence, upgradable to
HIGH with DOB tiebreaker), manual link/unlink, revert confirmed matches, and
automatic detection via PersonObserver. Includes 33 comprehensive tests, frontend
integration with confirm/dismiss/unlink UI, and match indicators in the persons list.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/Models/Person.php

@@ -121,7 +121,15 @@ final class Person extends Model
     public function pendingIdentityMatch(): HasOne
     {
         return $this->hasOne(PersonIdentityMatch::class)
-            ->where('status', IdentityMatchStatus::PENDING);
+            ->where('status', IdentityMatchStatus::PENDING)
+            ->latest();
+    }
+
+    public function confirmedIdentityMatch(): HasOne
+    {
+        return $this->hasOne(PersonIdentityMatch::class)
+            ->where('status', IdentityMatchStatus::CONFIRMED)
+            ->latest();
     }
 
     public function scopeApproved(Builder $query): Builder

api/app/Models/PersonIdentityMatch.php

@@ -26,6 +26,13 @@ final class PersonIdentityMatch extends Model
         'matched_on',
         'confidence',
         'status',
+        'match_details',
+        'confirmed_by_user_id',
+        'confirmed_at',
+        'dismissed_by_user_id',
+        'dismissed_at',
+        'reverted_by_user_id',
+        'reverted_at',
         'resolved_by_user_id',
         'resolved_at',
     ];
@@ -36,6 +43,10 @@ final class PersonIdentityMatch extends Model
             'matched_on' => IdentityMatchMethod::class,
             'confidence' => IdentityMatchConfidence::class,
             'status' => IdentityMatchStatus::class,
+            'match_details' => 'array',
+            'confirmed_at' => 'datetime',
+            'dismissed_at' => 'datetime',
+            'reverted_at' => 'datetime',
             'resolved_at' => 'datetime',
         ];
     }
@@ -55,6 +66,21 @@ final class PersonIdentityMatch extends Model
         return $this->belongsTo(User::class, 'resolved_by_user_id');
     }
 
+    public function confirmedBy(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'confirmed_by_user_id');
+    }
+
+    public function dismissedBy(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'dismissed_by_user_id');
+    }
+
+    public function revertedBy(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'reverted_by_user_id');
+    }
+
     public function scopePending(Builder $query): Builder
     {
         return $query->where('status', IdentityMatchStatus::PENDING);
@@ -69,4 +95,9 @@ final class PersonIdentityMatch extends Model
     {
         return $query->where('status', IdentityMatchStatus::DISMISSED);
     }
+
+    public function scopeForEvent(Builder $query, string $eventId): Builder
+    {
+        return $query->whereHas('person', fn (Builder $q) => $q->where('event_id', $eventId));
+    }
 }

api/app/Models/User.php

@@ -26,6 +26,7 @@ final class User extends Authenticatable
     protected $fillable = [
         'first_name',
         'last_name',
+        'date_of_birth',
         'email',
         'password',
         'timezone',
@@ -51,6 +52,7 @@ final class User extends Authenticatable
     protected function casts(): array
     {
         return [
+            'date_of_birth' => 'date',
             'email_verified_at' => 'datetime',
             'password' => 'hashed',
         ];