Fix/UI changes (#439)

* feat(bookkeeping): add preview for next voucher number in JournalEntryForm

* feat(encoding): implement U+FFFD recovery for Swedish text in encoding functions

lib/import/shared/__tests__/encoding.test.ts

@@ -3,6 +3,8 @@ import {
   decodeFileContent,
   decodeStringContent,
   hasEncodingIssues,
+  recoverStringWithFFFD,
+  recoverWordWithFFFD,
 } from '../encoding'
 
 describe('decodeStringContent', () => {
@@ -77,3 +79,75 @@ describe('decodeFileContent', () => {
     expect(decodeFileContent(cp1252)).toBe('GÖTEBORG')
   })
 })
+
+// --- U+FFFD heuristic recovery ---
+
+describe('recoverWordWithFFFD', () => {
+  it('recovers uppercase Ö in common Swedish stems', () => {
+    expect(recoverWordWithFFFD('F\uFFFDRENING')).toBe('FÖRENING')
+    expect(recoverWordWithFFFD('F\uFFFDRETAG')).toBe('FÖRETAG')
+    expect(recoverWordWithFFFD('G\uFFFDTEBORG')).toBe('GÖTEBORG')
+    expect(recoverWordWithFFFD('LINK\uFFFDPING')).toBe('LINKÖPING')
+  })
+
+  it('recovers lowercase ö in common Swedish stems', () => {
+    expect(recoverWordWithFFFD('f\uFFFDrening')).toBe('förening')
+    expect(recoverWordWithFFFD('malm\uFFFD')).toBe('malmö')
+    expect(recoverWordWithFFFD('k\uFFFDp')).toBe('köp')
+  })
+
+  it('recovers compound words via substring match', () => {
+    expect(recoverWordWithFFFD('BOSTADSR\uFFFDTTSF\uFFFDRENING')).toBe(
+      'BOSTADSRÄTTSFÖRENING'
+    )
+    expect(recoverWordWithFFFD('Idrottsf\uFFFDrening')).toBe('Idrottsförening')
+  })
+
+  it('is a no-op when the input has no U+FFFD', () => {
+    expect(recoverWordWithFFFD('FÖRENING')).toBe('FÖRENING')
+    expect(recoverWordWithFFFD('hello')).toBe('hello')
+  })
+
+  it('returns null for ambiguous words not in the dictionary', () => {
+    // Random 4-letter word with U+FFFD; no Swedish stem hits.
+    expect(recoverWordWithFFFD('Z\uFFFDXQ')).toBeNull()
+  })
+
+  it('returns null for words with too many U+FFFDs to disambiguate', () => {
+    expect(
+      recoverWordWithFFFD('\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD\uFFFD')
+    ).toBeNull()
+  })
+})
+
+describe('recoverStringWithFFFD', () => {
+  it('repairs the canonical "Levbet FÖRENING" case', () => {
+    expect(recoverStringWithFFFD('Levbet F\uFFFDRENING')).toBe('Levbet FÖRENING')
+  })
+
+  it('repairs city + business-name combos', () => {
+    expect(recoverStringWithFFFD('Sjöberg AB, Malm\uFFFD')).toBe('Sjöberg AB, Malmö')
+    expect(recoverStringWithFFFD('Faktura fr\uFFFDn G\uFFFDTEBORG AB')).toBe(
+      'Faktura från GÖTEBORG AB'
+    )
+  })
+
+  it('preserves punctuation, whitespace, and digits', () => {
+    expect(recoverStringWithFFFD('K\uFFFDp 1 234,56 SEK')).toBe('Köp 1 234,56 SEK')
+  })
+
+  it('is a no-op on clean strings', () => {
+    expect(recoverStringWithFFFD('Hello World')).toBe('Hello World')
+    expect(recoverStringWithFFFD('FÖRENING')).toBe('FÖRENING')
+  })
+
+  it('returns null when any word in the string is ambiguous', () => {
+    expect(recoverStringWithFFFD('FÖRENING Z\uFFFDXQ')).toBeNull()
+  })
+
+  it('is idempotent on recovered output', () => {
+    const once = recoverStringWithFFFD('F\uFFFDRENING')
+    expect(once).toBe('FÖRENING')
+    expect(recoverStringWithFFFD(once!)).toBe('FÖRENING')
+  })
+})