feat: add 4 new Swedish bank CSV parsers and improve transaction categorization

Add auto-detecting CSV parsers for Länsförsäkringar, ICA Banken, Skandia,
and Lunar. Refine SEB detection to avoid false matches. Update bank file
upload UI with new bank options and export instructions. Include booking
templates, improved AI categorization, and transaction review enhancements.

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

lib/transactions/category-suggestions.ts

@@ -1,6 +1,7 @@
 import { suggestCategory } from '@/lib/tax/expense-warnings'
 import { getExpenseAccountForCategory } from '@/lib/bookkeeping/category-mapping'
-import type { Transaction, TransactionCategory, MappingRule } from '@/types'
+import { findMatchingTemplates, type TemplateMatch } from '@/lib/bookkeeping/booking-templates'
+import type { Transaction, TransactionCategory, EntityType, MappingRule } from '@/types'
 
 export interface SuggestedCategory {
   category: TransactionCategory
@@ -177,3 +178,43 @@ export function mergeAiSuggestions(
     .sort((a, b) => b.confidence - a.confidence)
     .slice(0, 5)
 }
+
+// ============================================================
+// Template Suggestions
+// ============================================================
+
+export interface SuggestedTemplate {
+  template_id: string
+  name_sv: string
+  name_en: string
+  group: string
+  debit_account: string
+  credit_account: string
+  confidence: number
+  description_sv: string
+  risk_level: string
+  requires_review: boolean
+}
+
+/**
+ * Get suggested booking templates for a transaction.
+ * Uses multi-signal matching (MCC, keywords, description patterns).
+ */
+export function getSuggestedTemplates(
+  transaction: Transaction,
+  entityType?: EntityType
+): SuggestedTemplate[] {
+  const matches = findMatchingTemplates(transaction, entityType)
+  return matches.map((m: TemplateMatch) => ({
+    template_id: m.template.id,
+    name_sv: m.template.name_sv,
+    name_en: m.template.name_en,
+    group: m.template.group,
+    debit_account: m.template.debit_account,
+    credit_account: m.template.credit_account,
+    confidence: m.confidence,
+    description_sv: m.template.description_sv,
+    risk_level: m.template.risk_level,
+    requires_review: m.template.requires_review,
+  }))
+}