feat: add drill-down navigation between reports and general ledger (#112)

Enable clicking account rows in Trial Balance, Income Statement, and
Balance Sheet to navigate to the Huvudbok filtered to that account.
Voucher numbers in the Huvudbok now link to the journal entry detail
page. Breadcrumb trail supports tracing back through the navigation
chain.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/reports/general-ledger.ts

@@ -6,6 +6,7 @@ export interface GeneralLedgerLine {
   date: string
   voucher_series: string
   voucher_number: number
+  journal_entry_id: string
   description: string
   source_type: string
   debit: number
@@ -85,6 +86,7 @@ export async function generateGeneralLedger(
     account_number: string
     debit_amount: number
     credit_amount: number
+    journal_entry_id: string
     journal_entries: {
       entry_date: string
       voucher_number: number
@@ -95,7 +97,7 @@ export async function generateGeneralLedger(
   }>(({ from, to }) => {
     let query = supabase
       .from('journal_entry_lines')
-      .select('account_number, debit_amount, credit_amount, journal_entries!inner(entry_date, voucher_number, voucher_series, description, source_type, user_id, fiscal_period_id, status)')
+      .select('account_number, debit_amount, credit_amount, journal_entry_id, journal_entries!inner(entry_date, voucher_number, voucher_series, description, source_type, user_id, fiscal_period_id, status)')
       .eq('journal_entries.user_id', userId)
       .eq('journal_entries.fiscal_period_id', periodId)
       .in('journal_entries.status', ['posted', 'reversed'])
@@ -140,6 +142,7 @@ export async function generateGeneralLedger(
       date: entry.entry_date,
       voucher_series: entry.voucher_series || 'A',
       voucher_number: entry.voucher_number,
+      journal_entry_id: line.journal_entry_id,
       description: entry.description || '',
       source_type: entry.source_type || '',
       debit: Math.round((Number(line.debit_amount) || 0) * 100) / 100,