feat: Add accounting period selector for all views

- Add PeriodSelectorMini component for global period selection
- Add accountingPeriod store for shared period state
- Add calendar service/router/model for available periods API
- Update Dashboard, Invoices, Trial Balance, Bank/Cash Register views
  to respect selected period
- Fix Trial Balance navigation sync bug (period now syncs on mount)
- Update backend services to accept luna/an parameters

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

reports-app/frontend/src/views/TrialBalanceView.vue

@@ -238,11 +238,13 @@ import { ref, computed, onMounted, watch } from "vue";
 import { useToast } from "primevue/usetoast";
 import { useCompanyStore } from "../stores/companies";
 import { useTrialBalanceStore } from "../stores/trialBalance";
+import { useAccountingPeriodStore } from "../stores/accountingPeriod";
 import { exportToExcel, exportToPDF } from "../utils/exportUtils";
 
 const toast = useToast();
 const companyStore = useCompanyStore();
 const trialBalanceStore = useTrialBalanceStore();
+const periodStore = useAccountingPeriodStore();
 
 // State
 const selectedCompanyId = ref(companyStore.selectedCompany?.id_firma || null);
@@ -254,22 +256,8 @@ const localFilters = ref({
 
 // Computed
 const currentPeriodText = computed(() => {
-  const months = [
-    "Ianuarie",
-    "Februarie",
-    "Martie",
-    "Aprilie",
-    "Mai",
-    "Iunie",
-    "Iulie",
-    "August",
-    "Septembrie",
-    "Octombrie",
-    "Noiembrie",
-    "Decembrie",
-  ];
-  const monthName = months[trialBalanceStore.filters.luna - 1] || "";
-  return `${monthName} ${trialBalanceStore.filters.an}`;
+  // Use the global period store
+  return periodStore.selectedPeriod?.display_name || "";
 });
 
 // Methods
@@ -599,6 +587,14 @@ onMounted(async () => {
     await companyStore.loadCompanies();
   }
 
+  // FIX: Sync period from global periodStore BEFORE loading data
+  // This ensures Trial Balance shows the correct period when navigating
+  // from other views (e.g., Invoices with November selected)
+  if (periodStore.selectedPeriod) {
+    trialBalanceStore.filters.luna = periodStore.selectedPeriod.luna;
+    trialBalanceStore.filters.an = periodStore.selectedPeriod.an;
+  }
+
   // Load trial balance if company is selected
   if (companyStore.selectedCompany) {
     await loadTrialBalance();
@@ -614,6 +610,20 @@ watch(
     }
   },
 );
+
+// Watch for period changes - sync luna/an with trial balance store
+watch(
+  () => periodStore.selectedPeriod,
+  async (newPeriod) => {
+    if (newPeriod && companyStore.selectedCompany) {
+      await trialBalanceStore.changePeriod(
+        newPeriod.luna,
+        newPeriod.an,
+        companyStore.selectedCompany.id_firma
+      );
+    }
+  },
+);
 </script>
 
 <style scoped>