chore: repo-wide bloat sweep, remove dead code and fold duplicate helpers (#2150)

* chore: repo-wide bloat sweep, remove dead code and fold duplicate helpers

Remove 33 dead files, ~270 unreferenced exports/types, 13 dead i18n
namespaces and 4 unused dependencies; fold byte-identical helper copies
into one canonical home each (lib/utils chunk/sleep/utcDateStamp,
lib/dates/iso, lib/invariants/uuid, lib/xml/escape, lib/reports/sru/format,
lib/pdf/number-text, lib/browser/panel-request, lib/api/v1/body +
v1ValidationError rolled out to ~55 v1 routes, booking-template schemas).

No behaviour change: v1 bodies and status codes, MCP tool schemas, DB
writes and money math are untouched. Naive ore rounding was deliberately
not swapped for roundOre; see DECISIONS.md 2026-09-02 for the full list
of things left alone on purpose.

tsc, lint, 19588 unit tests and check:guards green; antipattern baseline
ratcheted (naive-ore-round 622 -> 620, hand-rolled-invariant 115 -> 113).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* test(transactions): import RawTransaction from @/types after the ingest re-export removal

CI's type ratchet (check:types, full tsconfig) caught the one test file
that still imported the type through lib/transactions/ingest.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

---------

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

components/reports/api-error.ts

@@ -0,0 +1,20 @@
+/**
+ * Small, shared readers for the `{ error }` envelope the report API routes
+ * return. Deliberately NOT lib/errors getErrorMessage: that one rewrites known
+ * patterns into user-facing Swedish, these just pick the string out.
+ */
+
+/** A string error is itself; an object with a string `message` yields it; else the fallback. */
+export function parseApiError(error: unknown, fallback: string): string {
+  if (typeof error === 'string') return error
+  if (error && typeof error === 'object') {
+    const message = (error as { message?: unknown }).message
+    if (typeof message === 'string') return message
+  }
+  return fallback
+}
+
+/** parseApiError applied to a JSON body's `error` field. */
+export function apiErrorMessage(json: unknown, fallback: string): string {
+  return parseApiError((json as { error?: unknown } | null)?.error, fallback)
+}