fix: article ordering, free-text rows, invoice back-nav, onboarding resilience (#1053) (#1056)

* fix: article number ordering, free-text rows, invoice back-nav, onboarding resilience (#1053)

Four fixes from Discord feedback in issue #1053:

- Articles now order by article number with numeric-aware comparison
  ('2' before '10', unnumbered last, name tiebreak) in the invoice
  editor's article picker and as the register's default sort, via a
  shared lib/articles/sort.ts. Name order put article "1" last.

- Invoice rows with no amounts (quantity 0, unit price 0) render as
  pure text rows on the PDF, the invoice detail page, and the review
  step via shared isTextLikeLine(), instead of printing
  "0 / 0,00 SEK / 0,00 SEK". Display-only; booking untouched.

- The invoice editor navigates with router.replace after saving, so
  the detail page's back arrow returns to the list instead of
  reopening a fresh editor from history.

- A transient query failure no longer reads as "no companies" /
  "onboarding not done": getActiveCompanyId throws
  CompanyContextError('resolution_failed') instead of returning null,
  the Edge middleware fails open on a degraded resolution (no
  onboarding redirect, no cookie clearing, no locale overwrite), and
  the dashboard page only redirects to /onboarding on a positively
  read incomplete/missing settings row. This is the likely cause of
  the completed onboarding wizard reappearing.

Fixes #1053

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

* docs: CLAUDE.md tenancy line matches actual resolution order (prefs-first, cookie not read)

The middleware stopped reading the gnubok-company-id cookie when
user_preferences became authoritative (RLS parity); the stale doc line
still described cookie-first order and misled review tooling.

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

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

DECISIONS.md

@@ -206,3 +206,6 @@ One line per decision: `[YYYY-MM-DD] <decision>: <why>`. Appended by agents and
 [2026-07-15] Issue #735 result-appropriation: did NOT run the mass 2099-to-2098 backfill. Prod audit showed the script read the FROZEN opening-balance 2099, not the CURRENT posted balance: 202 of 360 planned periods already carried their own disposition (mostly via SIE import) and 43 would have double-moved equity (worst case tens of MSEK on a single company), while periods without an OB entry fabricated balances via the cumulative-history fallback. Posted ONE verified entry for the reporting company (unblocking their arsredovisning) and rewrote the script to a current-balance-safe backfill: eligibility decided from current posted 2099, explicit OB entry required, already-disposed and ambiguous periods skipped to a manual-review report. planResultAppropriation/generateResultAppropriation untouched (steady-state year-end path, covered by pg-real tests); the safety lives in the sweep.
 [2026-07-17] create_account now enforces first-digit vs account_type consistency (superRefine at the commit boundary + fail-fast in the MCP tool): class 8 legitimately allows both revenue and expense (financial items per the BAS catalog), classes 0/9 stay unconstrained (free-use per the BAS standard); prevents contradictory rows like 2999+expense whose derived account_class would misclassify balance sheet vs income statement. PR-review findings on set_voucher_note (posted-entry immutability, BFL 5:5 audit trail) were refuted, not fixed: the notes-only carve-out is migration 20260608120000's whole-row to_jsonb diff and audit_journal_entries already records old/new on every UPDATE.
 [2026-07-17] Assistenten settings opens on Kunskap (konteringskarta) instead of Minne; dropped the nested Kompetens/Minne tab row inside Kunskap: it duplicated the top-level tabs one row above.
+[2026-07-17] getActiveCompanyId now throws CompanyContextError('resolution_failed') on query failure instead of returning null (issue #1053): null was indistinguishable from "no companies" and every caller redirects that state to /onboarding, so a transient DB failure showed onboarded users the wizard. Chose throw-at-the-source over a degraded-flag return so all redirect sites are fixed at once; withRouteContext already try/catches the call. The Edge middleware copy keeps a degraded flag instead (middleware cannot throw usefully) and fails open.
+[2026-07-17] Amount-less invoice rows (quantity 0 and unit price 0) render as text rows on PDF/detail/review via shared isTextLikeLine() instead of printing "0 / 0,00 SEK / 0,00 SEK" (issue #1053): users write free-text lines through the article picker's "Egen rad (fri text)" product row, not only the dedicated textrad button. Display-only; booking and validation semantics untouched.
+[2026-07-17] Articles default sort is article_number (numeric-aware via Intl.Collator numeric, unnumbered last, name tiebreak) in both the register and the invoice editor picker, replacing name order (issue #1053): users number articles precisely to control listing order, matching Fortnox convention.