fix(import): parse the SEB Transaktioner CSV layout (split Insättningar/Uttag) (#1616)

* fix(import): parse the SEB Transaktioner CSV layout (split Insättningar/Uttag)

The SEB profile only understood the Kontoutdrag export layout. The
Transaktioner page (the path most users find first) exports a different
header: Bokförd;Valutadatum;Text;Typ;Insättningar;Uttag;Bokfört saldo,
with dot decimals and the amount split across two columns. No profile
detected it, so auto-detection found nothing and an explicit SEB choice
failed on column detection.

Teach the SEB profile the layout: detect on the Insättningar/Uttag pair
(unique among supported formats), accept Bokförd as a booking-date
column, and combine the split amount (Uttag carries its own minus;
unsigned magnitudes are normalized to expenses). Fixture header and
first data row are verbatim from a user-provided export. The import
help text now lists both SEB export paths.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* docs: decision log for SEB Transaktioner parser design

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

DECISIONS.md

@@ -984,6 +984,7 @@ One line per decision: `[YYYY-MM-DD] <decision>: <why>`. Appended by agents and
 [2026-08-13] Radius ladder locked (convention 16): 4 tiers by role (pill toolbar controls / rounded-xl overlays / rounded-lg surfaces / rounded-sm leaves); rounded-md, bare rounded, rounded-2xl and rounded-[Npx] retired app-wide, hard-failed by check:guards off-ladder-radius. Before: 7 radii in circulation with no rule; one toolbar row on /transactions mixed 4 shape languages.
 [2026-08-13] Toolbar shape language: pills won over "inputs stay rectangles". Search in a page toolbar is a pill (ToolbarSearch, h-8) matching chips/pickers/buttons beside it; the same search inside a dialog or form keeps rounded-lg Input. Rationale: convention 8 already made pickers pill chips and convention 3 made buttons pills, so the rectangle search/segmented were the odd ones out; one row = one shape reads as trust.
 [2026-08-13] Dialogs promoted 8px -> 12px (rounded-xl): SettingsModal, slide-over and CommandPalette were already 12px, so dialog.tsx was the overlay-tier outlier, not the rule.
+[2026-08-14] SEB Transaktioner layout gets native seb-profile support (#1616), not a new format or generic_csv mapping: detect keys on the Insättningar/Uttag column pair (unique among supported formats, cannot steal files), and an unsigned Uttag magnitude is normalized to negative since the column is withdrawals by definition. User-provided sample rows are the verbatim fixture; #1565's explicit-choice fallback had nothing to fall back to because no profile parsed this layout at all.
 [2026-08-14] QuickReviewDialog inbox picker links picked docs with inbox_item_id but deliberately NOT transaction_id: the dialog's existing upload path never pinned transactions.document_id either, and adding the pin would be a drive-by behaviour change to uploads. Known asymmetry with TransactionBookingDialog, which pins both; revisit as its own change if the underlag indicator matters on rows booked from att-göra. Verified safe on the compliance side: since migration 20260703160000 every "saknar underlag" predicate (verifikat_without_documents, transactions_without_documents, the MCP tools, full-archive-export, the worklist badge) keys on document_attachments.journal_entry_id, never on transactions.document_id, so an unpinned row is never reported as missing underlag.
 [2026-08-14] The onboarding branch question ("Var fanns bokföringen innan?") became its own journey step at the existing KLART station (done -> source, same station grammar as momsyn/moms under MOMSEN) instead of a sixth rail station: a 6-point rail crowds the 680px band's 150px label slots, "BOKFÖRINGEN INNAN" would sit next to the existing "BOKFÖRINGEN" station, and mode='add' (which never sees the branch question) would need an asymmetric rail. The done screen ends in a revealed Fortsätt that dispatches DONE_CONTINUE (mode='first' only, reducer-guarded).
 [2026-08-14] Migration /preview fetches ALL allowed fiscal years (dropped latestOnly): the connect step's "Hittade X konton och Y verifikationer" renders from /preview's sieStats, not /sie-data's generateImportPreview, so fixing only /sie-data would have left the founder-reported "0 verifikationer" (actual: 4153) on screen. Costs one SIE export per extra year at connect time, the same work /sie-data repeats right after; honest counts won over latency.