Add user search and improve email lookup

Introduces a searchUsers function to find users by email or name with case-insensitive matching. Also updates getProfileByEmail to use ilike for case-insensitive email lookup and trims input whitespace.

Author: DongDuong2001

lib/database/connection.ts

@@ -300,10 +300,14 @@ export async function getProfileByEmail(email: string) {
     }
 
     const supabase = createClient()
+    
+    // Use ilike for case-insensitive search and trim whitespace
+    const trimmedEmail = email.trim().toLowerCase()
+    
     const { data, error } = await supabase
       .from('profiles')
       .select('*')
-      .eq('email', email)
+      .ilike('email', trimmedEmail)
       .single()
 
     if (error) {
@@ -317,6 +321,37 @@ export async function getProfileByEmail(email: string) {
   }
 }
 
+// Search for users by email or name
+export async function searchUsers(query: string, limit = 10) {
+  try {
+    if (!process.env.NEXT_PUBLIC_SUPABASE_URL || !process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY) {
+      console.warn('Supabase not configured')
+      return []
+    }
+
+    const supabase = createClient()
+    const trimmedQuery = query.trim()
+    
+    if (!trimmedQuery) return []
+
+    // Search by email or name (case-insensitive)
+    const { data, error } = await supabase
+      .from('profiles')
+      .select('id, email, name, avatar')
+      .or(`email.ilike.%${trimmedQuery}%,name.ilike.%${trimmedQuery}%`)
+      .limit(limit)
+    
+    if (error) {
+      console.warn('Error searching users:', error)
+      return []
+    }
+    return data || []
+  } catch (err) {
+    console.warn('Error searching users:', err)
+    return []
+  }
+}
+
 // ============================================
 // FILES
 // ============================================