Adds expense approval workflow

Implements expense approval functionality, allowing superusers to review and approve or reject expense entries.

This includes:
- Filtering account balance calculations and user balance calculations to only include cleared journal entries.
- Adding API endpoints to retrieve pending expense entries and approve/reject them.
- Updating the UI to display pending expenses to superusers and provide actions to approve or reject them.

This ensures better control over expenses within the system.

static/js/index.js

@@ -64,7 +64,8 @@ window.app = Vue.createApp({
         description: '',
         loading: false
       },
-      manualPaymentRequests: []
+      manualPaymentRequests: [],
+      pendingExpenses: []
     }
   },
   watch: {
@@ -493,6 +494,20 @@ window.app = Vue.createApp({
         console.error('Error loading manual payment requests:', error)
       }
     },
+    async loadPendingExpenses() {
+      try {
+        if (!this.isSuperUser) return
+
+        const response = await LNbits.api.request(
+          'GET',
+          '/castle/api/v1/entries/pending',
+          this.g.user.wallets[0].adminkey
+        )
+        this.pendingExpenses = response.data
+      } catch (error) {
+        console.error('Error loading pending expenses:', error)
+      }
+    },
     async approveManualPaymentRequest(requestId) {
       try {
         await LNbits.api.request(
@@ -527,6 +542,42 @@ window.app = Vue.createApp({
         LNbits.utils.notifyApiError(error)
       }
     },
+    async approveExpense(entryId) {
+      try {
+        await LNbits.api.request(
+          'POST',
+          `/castle/api/v1/entries/${entryId}/approve`,
+          this.g.user.wallets[0].adminkey
+        )
+        this.$q.notify({
+          type: 'positive',
+          message: 'Expense approved!'
+        })
+        await this.loadPendingExpenses()
+        await this.loadBalance()
+        await this.loadTransactions()
+        await this.loadAllUserBalances()
+      } catch (error) {
+        LNbits.utils.notifyApiError(error)
+      }
+    },
+    async rejectExpense(entryId) {
+      try {
+        await LNbits.api.request(
+          'POST',
+          `/castle/api/v1/entries/${entryId}/reject`,
+          this.g.user.wallets[0].adminkey
+        )
+        this.$q.notify({
+          type: 'warning',
+          message: 'Expense rejected'
+        })
+        await this.loadPendingExpenses()
+        await this.loadTransactions()
+      } catch (error) {
+        LNbits.utils.notifyApiError(error)
+      }
+    },
     copyToClipboard(text) {
       navigator.clipboard.writeText(text)
       this.$q.notify({
@@ -674,9 +725,10 @@ window.app = Vue.createApp({
     await this.loadAccounts()
     await this.loadCurrencies()
     await this.loadManualPaymentRequests()
-    // Load users if super user (for receivable dialog)
+    // Load users and pending expenses if super user
     if (this.isSuperUser) {
       await this.loadUsers()
+      await this.loadPendingExpenses()
     }
   }
 })