feat(dimensions): PR2 registry — CRUD API, register UI, settings toggle, SIE export on the new registry (#858)

* feat(dimensions): PR2 registry — CRUD API, register UI, settings toggle, SIE export on the new registry

Phase 2 of dev_docs/dimensions_implementation_plan.md. Companies with
dimensions_enabled=false (default) see zero change.

API:
- Dashboard CRUD: GET /api/dimensions (lazy-seeds system dims 1/6 via the
  ensure_company_dimensions RPC), PATCH /api/dimensions/[id] (is_system
  rename blocked), POST/PATCH/DELETE values (code immutable after creation;
  strict Fortnox code format ^[A-Za-z0-9ÅÄÖåäö_+\-]{1,20}$ at the API layer;
  retention-trigger deletes surface the Swedish "arkivera istället" message
  as 409 DIMENSION_VALUE_REFERENCED).
- POST /api/dimensions/import-existing — scans journal_entry_lines.dimensions
  for unregistered codes and mints inactive placeholder registry rows.
- v1 public API: GET dimensions + POST values (Idempotency-Key, dry-run),
  registered in the OpenAPI spec (102→104 endpoints).
- dimensions_enabled boolean on company_settings (new migration,
  UI-visibility only, never correctness-bearing) exposed through the
  existing settings read/update path.

SIE export (lib/reports/sie-export.ts):
- Reads the new dimensions/dimension_values registry; legacy
  cost_centers/projects tables now have zero readers (drop migration next).
- Fixes the latent Visma-rejection bug: #OBJEKT now declared for INACTIVE
  values referenced by lines.
- Generic-N: #DIM/#UNDERDIM loop sorted by sie_dim_no; #TRANS object lists
  serialize from the line JSONB map (sorted, '01'→'1' collapse); orphan
  codes/dims synthesize declarations from the SIE reserved-number seed —
  every referenced (dim, code) pair is guaranteed declared.

UI:
- /dimensions register (Register-recipe): tabs per dimension, search,
  sortable table, value dialog (code immutable on edit, projekt dates on
  dim 6), archive-not-delete affordances.
- DimensionCombobox shipped (mounts in the tagging PR).
- Settings toggle "Aktivera kostnadsställen & projekt" — toggle-on runs the
  import-existing scan and links to the register.
- Nav row in redovisning, rendered only when dimensions_enabled (same
  mechanism as pays_salaries).
- dimensions.* i18n namespace (51 keys, sv/en parity).
- Sandbox seed: demo dims + values, revenue line tagged {"1":"BUTIK","6":"P001"}.

Verified: 6328/6328 unit tests, guard + coverage gate green, tsc parity with
main (210=210), production build passes.

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

* fix(dimensions): PR2 review round — atomic archived-create, UNDERDIM ordering, import robustness, date semantics

- POST values accepts is_active so "create as archived" is atomic; the UI's
  fragile create-then-PATCH fallback is deleted (PR Agent finding 1).
- DimensionCombobox blur revert reads the committed value/values through refs
  so a selection landing inside the 150ms window always wins (finding 2).
- import-existing sanitizes candidate codes like the PR1 backfill and upserts
  with ignoreDuplicates — one bad/duplicate code can no longer abort the
  batch; created counted from returned rows (finding 3).
- SIE export emits all root #DIM before any #UNDERDIM so a parent always
  precedes a lower-numbered child (SIE4 declaration order — Swedish review);
  synthesized placeholder declarations now log one structured warning
  (BFNAR 2013:2 behandlingshistorik) + defence-in-depth comment.
- Value dates rejected (400 DIMENSION_VALUE_DATES_NOT_ALLOWED) when the
  parent dimension is flow-period (resets_annually=true); explicit null
  still clears (Swedish review).
- Sandbox seed logs seeded dimension codes; GET /api/dimensions documents
  the deliberate absence of dimensions_enabled gating (UI-visibility flag,
  not a security boundary — compliance-swarm V8.2.1 rejected by design).

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

---------

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

lib/errors/structured-errors.ts

@@ -2462,6 +2462,75 @@ const ASSETS: Record<string, StructuredErrorEntry> = {
   },
 }
 
+// Dimensions registry (kostnadsställe/projekt) — dev_docs/dimensions_implementation_plan.md §6
+const DIMENSION: Record<string, StructuredErrorEntry> = {
+  DIMENSION_NOT_FOUND: {
+    httpStatus: 404,
+    message_sv: 'Dimensionen kunde inte hittas.',
+    message_en: 'Dimension not found.',
+  },
+  DIMENSION_SYSTEM_RENAME: {
+    httpStatus: 400,
+    message_sv: 'Systemdimensioner kan inte döpas om.',
+    message_en: 'System dimensions (kostnadsställe/projekt) cannot be renamed.',
+  },
+  DIMENSION_UPDATE_FAILED: {
+    httpStatus: 500,
+    message_sv: 'Dimensionen kunde inte uppdateras.',
+    message_en: 'Failed to update dimension.',
+  },
+  DIMENSION_VALUE_NOT_FOUND: {
+    httpStatus: 404,
+    message_sv: 'Dimensionsvärdet kunde inte hittas.',
+    message_en: 'Dimension value not found.',
+  },
+  DIMENSION_VALUE_DUPLICATE_CODE: {
+    httpStatus: 409,
+    message_sv: 'Ett värde med samma kod finns redan i dimensionen.',
+    message_en: 'A value with that code already exists in the dimension.',
+  },
+  DIMENSION_VALUE_DATES_NOT_ALLOWED: {
+    httpStatus: 400,
+    message_sv: 'Datum kan bara sättas på ackumulerande dimensioner (t.ex. projekt).',
+    message_en:
+      'Start/end dates can only be set on accumulating dimensions (e.g. projects) — this dimension resets annually.',
+  },
+  DIMENSION_VALUE_CREATE_FAILED: {
+    httpStatus: 500,
+    message_sv: 'Dimensionsvärdet kunde inte skapas.',
+    message_en: 'Failed to create dimension value.',
+  },
+  DIMENSION_VALUE_UPDATE_FAILED: {
+    httpStatus: 500,
+    message_sv: 'Dimensionsvärdet kunde inte uppdateras.',
+    message_en: 'Failed to update dimension value.',
+  },
+  // The DB retention trigger (enforce_dimension_value_retention) raises when a
+  // code is referenced by posted/reversed lines. Routes surface the trigger's
+  // own Swedish message via `messageSv` so the code + kod appear in the toast.
+  DIMENSION_VALUE_REFERENCED: {
+    httpStatus: 409,
+    message_sv:
+      'Värdet används på bokförda verifikat och kan inte tas bort — arkivera det istället.',
+    message_en:
+      'The value is referenced by posted vouchers and cannot be deleted — archive (inactivate) it instead.',
+    remediation: {
+      description:
+        'Archive the value instead: PATCH the dimension value with { "is_active": false }. Codes referenced by posted lines are retained for the BFL 7-year period.',
+    },
+  },
+  DIMENSION_VALUE_DELETE_FAILED: {
+    httpStatus: 500,
+    message_sv: 'Dimensionsvärdet kunde inte tas bort.',
+    message_en: 'Failed to delete dimension value.',
+  },
+  DIMENSION_IMPORT_FAILED: {
+    httpStatus: 500,
+    message_sv: 'Import av befintliga dimensionskoder misslyckades.',
+    message_en: 'Failed to import existing dimension codes from journal lines.',
+  },
+}
+
 // ─────────────────────────────────────────────────────────────────
 // Combined registry
 // ─────────────────────────────────────────────────────────────────
@@ -2505,6 +2574,7 @@ const REGISTRY: Record<string, StructuredErrorEntry> = {
   ...SKATTEVERKET,
   ...BOLAGSVERKET,
   ...ASSETS,
+  ...DIMENSION,
 }
 
 export function getErrorEntry(code: string): StructuredErrorEntry | undefined {