feat(sandbox): seed payroll, articles and a year of ledger history; calm the connect CTAs (#1437)

* feat(sandbox): seed payroll, articles and a year of ledger history; calm the connect CTAs

The sandbox showed neither Löner nor a usable set of reports, and the
"connect X" surfaces were oversized boxed cards.

Sandbox seed:
- pays_salaries + employer_registered, so Löner and Anställda appear at all
  (an enskild firma is not an employer by default). Both seeded employees are
  employment_type 'employee': an EF may employ staff, just not its own owner.
- Two employees, one booked and one open lönekörning, and the three verifikat
  the booked run must have posted (7210/2710/1930, 7510/2731, 7290+7519/
  2920+2940). Skatteavdrag comes from the real Skatteverket 2026 tables.
- Year-to-date ledger history, January through last month, with the quarterly
  momsredovisning cleared to 2650 and paid on the SFL deadline. Without the
  settlement the demo collected VAT all year and never remitted it, which left
  an implausible bank balance and 155 813 kr of moms "att betala".
- The history is exempted through journal_entry_no_doc_required, the same way
  the SIE-import opt-in treats imported books: its kvitton live in the previous
  system, and unflagged it put 39 "verifikat utan underlag" on the home screen.
- Artikelregister, and the BAS accounts the K1 chart omits for an enskild firma.
- History is numbered before the invoice and payroll vouchers so the series runs
  forwards through the year, and its writes are batched.

Connect CTAs:
- Bank picker: a two-column grid of 95px bordered logo cards becomes flat
  hairline rows, Lucide icons, and a quiet inline connecting state.
- Cloud backup: each provider collapses to one row; the BFL note is shown once
  for the section and names only configured destinations.
- Hem first-run: only the active step argues its case, but every not-done step
  keeps a reachable action. The Skatteverket nudge becomes one quiet sentence.

Mobile assistant FAB: a fresh open is desktop-only, since the bottom nav already
has an Assistent tab. A collapsed session keeps its handle everywhere except
/chat, which is itself the way back to the conversation.

Also closes a real hole: /api/salary/runs/[id]/payslips/send had no sandbox
guard, and a seeded booked run put "Skicka lönebesked" one click from an
anonymous visitor with live Resend behind it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix(sandbox): check the two unchecked Supabase errors and tighten review nits

CodeRabbit review on #1437.

Major: two calls discarded their error and continued with null data. A failed
chart_of_accounts re-select would have written account_id: null onto every
ledger-history and salary voucher line, and a failed next_voucher_number would
have inserted a posted verifikat with no number, which is a hole in the
verifikationsserie (BFNAR 2013:2). Both now throw, and a null voucher number is
rejected explicitly.

Minor: the A-004 note claimed a 10 % markup on numbers that are 11.1 %; the
salary breakdown test's name said the opposite of its assertions after the
switch to the real tax table; the ledger-history doc still said 4 to 6 verifikat
per month before the quarterly momsredovisning added a seventh in March, May and
June.

Bank picker: the spinner is aria-hidden, so loading and connecting had no text
equivalent and a failed bank fetch was never announced. Added role="status" with
an sr-only label, and role="alert" on the error line.

Declined: confirm-before-disconnect on the cloud-backup row. Disconnect was
unconfirmed before this PR too, so adding a dialog is a behaviour change beyond
the redesign rather than a fix to it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

DECISIONS.md

@@ -806,3 +806,6 @@ One line per decision: `[YYYY-MM-DD] <decision>: <why>`. Appended by agents and
 [2026-08-06] Kontantmetoden year-end cut-off (BFL 5 kap 2 §) books moms to the VILANDE accounts (2618/2628/2638 ut, 2648 in), never 2611/2641: vilande accounts are deliberately absent from ACCOUNT_RUTA/ACCOUNT_TO_BOX, so the moms stays out of the momsdeklaration until payment, which is what bokslutsmetoden requires. 2647 was considered and rejected: it is domestic omvand betalningsskyldighet, unrelated. Cut-off posts as two AGGREGATE verifikat reversed on day 1 of the next period, and deliberately does NOT set invoices.journal_entry_id: the payment flows route on that link, so per-invoice linking would send every new-year payment down the accrual clearing path against a receivable the vandning already removed, booking the settlement twice.
 [2026-08-06] Prompt clarifications render from a structured summary (lib/agent-context/chat-clarifications.ts), never off the raw channel_context blob. A WhatsApp "nej" stores representation with participants:[] and purpose:null and denied:true, so branching on `!purpose` reads a settled denial as a half answer: the shipped renderer emitted "syfte SAKNAS: fråga bara efter syftet" about a meal the user had just said was not representation. `denied` and the genuine half answer (participants named, purpose missing, which BFL 5 kap 6-7 § does want completed) are now separate states. Also: the photo caption no longer reaches the prompt, for the reason already written down in channel-context-notes.ts (nobody was asked for it, nobody reviewed it), and free text passes through flattenMemoryContent because promptTemplate output is seeded as a user message and wrapToolResult only wraps tool results.
 [2026-08-06] Unmatched underlag are PROPOSED to the assistant, never auto-linked. WhatsApp intake writes neither invoice_inbox_items.matched_transaction_id nor transactions.document_id, so a chat-captured receipt is invisible to every lookup and #1425's backfill-by-document_id has nothing to backfill. Scoring unmatched items at read time (lib/agent-context/underlag-candidates.ts, reusing core-receipt-matcher) closes that with no migration and no link written by a machine, preserving the human confirm step; setting matched_transaction_id at intake above a confidence bar remains the open alternative and is a founder call. An uncomparable cross-currency amount disqualifies a candidate outright, because the matcher drops the amount signal there and date + merchant alone score 1.0.
+[2026-08-06] Sandbox ledger history marked no_doc_required instead of seeding receipt documents: the history represents books kept before the company arrived in Accounted, so its underlag sits in the previous system. Same rationale and same sidecar table the SIE-import opt-in uses. Without it the demo's first screen read "Verifikat utan underlag: 39".
+[2026-08-06] Sandbox payroll takes skatteavdrag from FALLBACK_TAX_TABLES_2026 rather than a flat schablon: the draft run ships calculated, so its live "Beräkna om" would have jumped ~4 600 kr away from the sibling booked run, and a wrong skatteavdrag would show unlabelled in the payslip, the 2710 line and the AGI figures.
+[2026-08-06] Added guardSandbox to /api/salary/runs/[id]/payslips/send: it was the only send path without one, and seeding a booked salary run put "Skicka lönebesked" one click from an anonymous visitor with live Resend behind it.