feat(dimensions): PR10 advanced — custom dimensions, hierarchy, account rules, commit enforcement (#886)

* feat(dimensions): PR10 advanced — custom dimensions, hierarchy, account rules, commit enforcement

The final rung of the dimensions ladder
(dev_docs/dimensions_implementation_plan.md §7 row 10):

- custom dimensions: POST /api/dimensions creates registry dims (next free
  SIE number >= 20 when omitted; explicit numbers allowed — SIE import
  already mints reserved ones); register gets a 'Ny dimension' dialog with
  a quiet Avancerat disclosure for the #UNDERDIM parent; GET now carries
  parent_sie_dim_no (the column + SIE round-trip existed since PR1/PR5 —
  this exposes it)
- account_dimension_rules (migration 20260703120000): one rule per
  (account, dimension) — required / default / fixed, per-rule is_active,
  company-scoped RLS, composite FK to the registry, value-presence CHECK
- enforcement, opt-in BY CONSTRUCTION (zero rules = engine byte-identical;
  deliberately NO settings toggle — a rule that exists but is ignored is
  worse than either extreme): default/fixed apply onto line bags at draft
  creation (fixed overwrites, default fills); required asserts at
  commitEntry with a Swedish MANDATORY_DIMENSION_MISSING naming every
  account + dimension; the bulk-book route runs the same policy before its
  RPC; storno/correction paths never pass through commitEntry so history
  always reverses regardless of policy; rule fetches fail open incl.
  thrown exceptions
- chart of accounts: per-account Dimensionsregler section in
  EditAccountDialog (Krävs/Förval/Låst, value picker, pause switch),
  gated on the existing dimensions toggle, quiet when empty
- pickers: LineDimensionFields is registry-driven (one combobox per active
  dimension, cached fetch, hardcoded 1/6 fallback) — every existing mount
  lights up custom dims with zero changes
- agent briefing: per-dimension required_on_accounts/default_on_accounts
  so agents self-correct instead of bouncing off the policy error
- rules CRUD API with existence/active/company validation and qualified
  DTO ids; firm_id FK deferred until the firms table lands (per plan)

39 new tests (pure-fn rules, engine enforcement, both new API surfaces,
pg-real RLS/CHECK/cascade suite); full suite 6,791 green; migration
replayed on a fresh container.

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

* fix: renumber migration to 20260703200000 — version collision with prod

The concurrent session shipped pending_operations_add_link_document_to_voucher
as 20260703120000 today; the Supabase preview branch (cloned from prod)
rejected the duplicate version key.

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

* fix: review round — auto-pick retry on collision, fail-open warnings, query schema

- POST /api/dimensions retries once past a concurrent number claim when the
  number was auto-picked (explicit choices still 409)
- every fail-open skip of the dimension-rules policy now logs a structured
  warning (engine draft/commit paths + bulk-book) — deliberate fail-open,
  but observable
- GET /api/dimensions/rules validates its query through
  ListDimensionRulesQuerySchema instead of an inline regex

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

---------

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

components/dimensions/types.ts

@@ -19,17 +19,38 @@ export interface DimensionValueDto {
 
 export interface DimensionDto {
   id: string
-  /** SIE #DIM number (1 = Kostnadsställe, 6 = Projekt). */
+  /** SIE #DIM number (1 = Kostnadsställe, 6 = Projekt, 20+ = custom). */
   sie_dim_no: number
   name: string
   resets_annually: boolean
   is_system: boolean
   is_active: boolean
   sort_order: number
+  /** SIE #UNDERDIM parent — the sie_dim_no of the parent dimension, or null. */
+  parent_sie_dim_no: number | null
   /** Sorted by code by the API. */
   values: DimensionValueDto[]
 }
 
+export type DimensionRuleType = 'required' | 'default' | 'fixed'
+
+/**
+ * Per-account dimension rule as served by GET /api/dimensions/rules —
+ * a flattened join row (rule + dimension + optional pinned value).
+ */
+export interface AccountDimensionRuleDto {
+  account_dimension_rule_id: string
+  account_number: string
+  dimension_id: string
+  sie_dim_no: number
+  dimension_name: string
+  rule_type: DimensionRuleType
+  value_id: string | null
+  value_code: string | null
+  value_name: string | null
+  is_active: boolean
+}
+
 /** SIE dimension number whose values carry start/end dates (Projekt). */
 export const PROJECT_DIM_NO = 6
 
@@ -54,3 +75,22 @@ export async function fetchDimensions(): Promise<DimensionDto[]> {
   }
   return (json?.dimensions ?? []) as DimensionDto[]
 }
+
+let cachedDimensionsPromise: Promise<DimensionDto[]> | null = null
+
+/**
+ * Module-level cached variant of fetchDimensions for high-mount-count
+ * consumers (one registry fetch per page load instead of one per line
+ * picker). A failed fetch clears the cache so the next mount retries.
+ * Registry mutations are rare enough that staleness within a page visit
+ * is acceptable — the register UI uses the uncached fetch.
+ */
+export function fetchDimensionsCached(): Promise<DimensionDto[]> {
+  if (!cachedDimensionsPromise) {
+    cachedDimensionsPromise = fetchDimensions().catch((err) => {
+      cachedDimensionsPromise = null
+      throw err
+    })
+  }
+  return cachedDimensionsPromise
+}