Adds equity eligibility check for expenses

Improves the expense tracking component by fetching user information to determine equity eligibility.

This allows displaying the "Convert to equity" checkbox only to eligible users, enhancing the user experience and ensuring accurate expense categorization.

Also includes error handling to prevent the form from breaking if user information cannot be loaded.

src/modules/expenses/services/ExpensesAPI.ts

@@ -7,7 +7,8 @@ import type {
   Account,
   ExpenseEntryRequest,
   ExpenseEntry,
-  AccountNode
+  AccountNode,
+  UserInfo
 } from '../types'
 import { appConfig } from '@/app.config'
 
@@ -263,4 +264,32 @@ export class ExpensesAPI extends BaseService {
       throw error
     }
   }
+
+  /**
+   * Get user information including equity eligibility
+   *
+   * @param walletKey - Wallet key for authentication (invoice key)
+   */
+  async getUserInfo(walletKey: string): Promise<UserInfo> {
+    try {
+      const response = await fetch(`${this.baseUrl}/castle/api/v1/user/info`, {
+        method: 'GET',
+        headers: this.getHeaders(walletKey),
+        signal: AbortSignal.timeout(this.config?.apiConfig?.timeout || 30000)
+      })
+
+      if (!response.ok) {
+        throw new Error(`Failed to fetch user info: ${response.statusText}`)
+      }
+
+      return await response.json()
+    } catch (error) {
+      console.error('[ExpensesAPI] Error fetching user info:', error)
+      // Return default non-eligible user on error
+      return {
+        user_id: '',
+        is_equity_eligible: false
+      }
+    }
+  }
 }