fix: localize hardcoded strings in financial reports

- Fix cash_flow_statement.net_cash_investing not being localized
- Add translation keys for Account name, Total, sheet name, From/To dates
- Create contact_summary_balance.json for Customer/Vendor Balance Summary
- Create trial_balance_sheet.json for Trial Balance Sheet columns
- Create inventory_item_details.json for Inventory Item Details
- Create transactions_by_contact.json for Transactions by Contact
- Fix hardcoded strings in TrialBalanceSheetTable column labels
- Fix hardcoded 'Total' in CustomerBalanceSummary and VendorBalanceSummary
- Fix hardcoded column headers in InventoryItemDetailsTable
- Fix hardcoded Opening/Closing balance strings

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/server/src/i18n/en/cash_flow_statement.json

@@ -9,5 +9,10 @@
   "net_cash_financing": "Net cash provided by financing activities",
   "cash_beginning_period": "Cash at beginning of period",
   "net_cash_increase": "NET CASH INCREASE FOR PERIOD",
-  "cash_end_period": "CASH AT END OF PERIOD"
+  "cash_end_period": "CASH AT END OF PERIOD",
+  "account_name": "Account name",
+  "total": "Total",
+  "sheet_name": "Statement of Cash Flow",
+  "from_date": "From",
+  "to_date": "To"
 }

packages/server/src/i18n/en/contact_summary_balance.json

@@ -0,0 +1,5 @@
+{
+  "account_name": "Account name",
+  "total": "Total",
+  "percentage_column": "% of Column"
+}

packages/server/src/i18n/en/inventory_item_details.json

@@ -0,0 +1,14 @@
+{
+  "opening_balance": "Opening balance",
+  "closing_balance": "Closing balance",
+  "date": "Date",
+  "transaction_type": "Transaction type",
+  "transaction_number": "Transaction #",
+  "quantity": "Quantity",
+  "rate": "Rate",
+  "total": "Total",
+  "value": "Value",
+  "profit_margin": "Profit Margin",
+  "running_quantity": "Running quantity",
+  "running_value": "Running Value"
+}

packages/server/src/i18n/en/transactions_by_contact.json

@@ -0,0 +1,4 @@
+{
+  "opening_balance": "Opening balance",
+  "closing_balance": "Closing balance"
+}

packages/server/src/i18n/en/trial_balance_sheet.json

@@ -0,0 +1,6 @@
+{
+  "account": "Account",
+  "debit": "Debit",
+  "credit": "Credit",
+  "total": "Total"
+}