Add/user feedback (#679)

* feat(bookkeeping): make blocked fiscal-year creation actionable

When creating a new räkenskapsår is blocked because a prior period is
still open, the "Skapa räkenskapsår" dialog no longer dead-ends on an
English toast. The API now returns the canonical bilingual error envelope
with the blocking periods (id/name/dates) under details, and the dialog
renders a Swedish panel that locks them inline (reversible locked_at) via
the existing /lock endpoint and retries creation.

The guard rule is unchanged and remains BFL-compliant: BFL 6 kap allows
löpande bokföring of the new year in parallel with the prior year's
bokslut, so a lock (not a full close) is sufficient and reversible.

- Add PERIOD_CREATE_BLOCKED_BY_OPEN_PERIODS structured error code
- Return envelope + details.blockingPeriods from the 409 (was English string)
- CreatePeriodDialog: inline "lås och skapa" panel + lock-and-retry
- Update route tests for the new envelope shape

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(ui): prevent mouse wheel from mutating number inputs

A focused <input type="number"> would change its value on scroll,
silently turning e.g. a 20000 salary into 19998. Blur number inputs
on wheel so the page scrolls instead of editing the value. Applied
at the Input primitive so all number fields are protected.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* feat(salary): auto-derive skattetabell and kolumn for employees

Replace the opaque manual "Skattetabell (29-42)" and "Kolumn (1-6)" inputs
on the employee form with a self-deriving flow: the user picks their
folkbokföringskommun from a searchable dropdown and the tax table fills
itself in, while the column derives from the personnummer we already collect.

- Add a searchable municipality picker (MunicipalityCombobox) backed by a
  new cached GET /api/salary/tax-tables/kommuner endpoint.
- Wrap the whole "Skatt" card in a self-contained EmployeeTaxCard used by
  both the create and edit pages, with InfoTooltips and named column options.
- deriveTaxColumn(): auto-select column 1 for under-66 employees; leave the
  ambiguous 66+ case (pension vs working senior) to a clearly-named manual
  choice.
- Fix fetchKommunTaxRates() to page through all ~1300 församling rows instead
  of a single 500-row page (which silently dropped ~200 kommuner, incl.
  Göteborg) and normalize the uppercase names to title case.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(import): correct CSV amount-column guess and surface skipped rows

Manual CSV column-mapping auto-guess walked each data row right-to-left
and picked the first numeric cell as the amount, so on the common
...;Belopp;Saldo layout it grabbed the trailing running-balance column.
Extract the guess into a pure, tested suggestColumnMapping(): match
header labels first (belopp/amount -> amount, saldo/balance -> balance),
auto-fill the balance field, and fall back to value heuristics that skip
the balance column and prefer a column carrying negative values.

Also surface stats.skipped_rows + parse warnings in BankFileConfirmStep -
the manual-mapping path skips the preview step that was the only place
they showed, so skipped rows were silently dropped from view.

Add a unit test reproducing the Saldo-as-amount regression.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* feat: add "Save as draft" functionality for invoices

- Implemented a new feature to allow users to save invoices as unnumbered drafts without generating an invoice number until finalized.
- Added a `save_as_draft` flag to the CreateInvoiceInput schema to handle draft saving logic.
- Updated the invoice creation API to skip number allocation when saving as a draft.
- Introduced a new endpoint for finalizing drafts, which allocates an invoice number and emits an `invoice.created` event.
- Enhanced the UI to include a "Save as draft" button, with loading states and tooltips.
- Updated tests to cover the new draft saving and finalization logic, including race conditions for concurrent modifications.
- Added relevant error handling for draft finalization and deletion scenarios.

* feat(employee): add employment start and end date fields to employee forms

* feat: enhance invoice and salary run handling with improved validation and event logging

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

components/import/BankFileColumnMappingStep.tsx

@@ -22,7 +22,7 @@ import {
 } from '@/components/ui/table'
 import { ArrowLeft, ArrowRight, Columns3 } from 'lucide-react'
 import { formatCurrency } from '@/lib/utils'
-import { getCSVPreview, normalizeMinusSign } from '@/lib/import/bank-file/formats/generic-csv'
+import { getCSVPreview, normalizeMinusSign, suggestColumnMapping } from '@/lib/import/bank-file/formats/generic-csv'
 import type { GenericCSVColumnMapping } from '@/lib/import/bank-file/types'
 
 const HEADER_KEYWORDS = [
@@ -137,29 +137,20 @@ export default function BankFileColumnMappingStep({
 
   const dataRows = hasHeader ? parsedRows.slice(detectedHeaderRow + 1) : parsedRows
 
-  // Auto-guess date/description/amount columns from the first data row.
-  // Only used as initial defaults — user can override any pick.
-  // Match ASCII and Unicode minus; some banks (e.g. Northmill) use U+2212.
-  const AMOUNT_RE = /^[-\u2212\u2013\u2014\u2010]?\d+([.,]\d+)?$/
+  // Auto-guess date/description/amount/balance columns. Matches header labels
+  // first (so the trailing Saldo column is never picked as the amount), then
+  // falls back to value heuristics. Initial defaults only — user can override.
   useEffect(() => {
     if (dateCol !== -1 || descCol !== -1 || amountCol !== -1) return
-    const sample = dataRows[0]
-    if (!sample || sample.length === 0) return
+    if (dataRows.length === 0) return
 
-    const dateIdx = sample.findIndex((cell) =>
-      DATE_PATTERNS.some((re) => re.test(cell.trim()))
-    )
-    const amountIdx = sample
-      .map((cell, i) => ({ i, cell: cell.trim().replace(/\s/g, '') }))
-      .reverse()
-      .find(({ cell, i }) => AMOUNT_RE.test(cell) && i !== dateIdx)?.i ?? -1
-    const descIdx = sample.findIndex((_, i) => i !== dateIdx && i !== amountIdx)
-
-    if (dateIdx >= 0) setDateCol(dateIdx)
-    if (descIdx >= 0) setDescCol(descIdx)
-    if (amountIdx >= 0) setAmountCol(amountIdx)
+    const suggestion = suggestColumnMapping(hasHeader ? columnHeaders : null, dataRows)
+    if (suggestion.date >= 0) setDateCol(suggestion.date)
+    if (suggestion.description >= 0) setDescCol(suggestion.description)
+    if (suggestion.amount >= 0) setAmountCol(suggestion.amount)
+    if (suggestion.balance >= 0) setBalanceCol(suggestion.balance)
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [dataRows])
+  }, [dataRows, hasHeader, columnHeaders])
 
   const isValid = dateCol >= 0 && descCol >= 0 && amountCol >= 0