style(ui): system-wide UX/UI polish pass — design-system conformance + copy cleanup (#835)

* style(ui): system-wide UX/UI polish pass — design-system conformance + copy cleanup

Multi-agent scan of all 404 UI files against the locked design system, then
141 verified surgical fixes across 109 files (net -32 lines):

- Remove forbidden elevation/motion: shadow-* and rounded-xl on cards, active:scale
  bounce, hover:shadow on list items, transition-all -> transition-colors.
- Drop font-medium from single-weight Hedvig display headings/numerals.
- Replace raw rainbow Tailwind status colors with Badge variants / brand tokens /
  neutral surfaces (achromatic chrome, semantic colors stay data-only).
- Route raw dates through formatDate(), hand-rolled currency through formatCurrency(),
  add tabular-nums to financial figures; text-gray-* -> text-foreground tokens.
- Swap hand-rolled skeletons for the Skeleton primitive; off-scale spacing -> token scale.
- Fix copy: mislabeled "Leverantörsfakturor" -> "Utgifter" on bank-import outflow total,
  collapse no-op identical-branch ternaries, broken Swedish diacritics (mojibake),
  correct mismatch-password toast, correct supplier currency-field label.
- Remove PII-leaking debug console.log on register, stray console.logs.

Verified: tsc clean on all changed files, eslint clean, production build passes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(auth): sanitize residual error logs in register flow

Follow-up to PR review (compliance swarm V16 / GDPR Art.5(1)(f)): the
remaining console.error calls in the register flow passed raw error
objects, which Supabase may populate with PII (email) in nested fields.
Log only sanitized message strings instead.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

components/settings/FiscalPeriodEditor.tsx

@@ -174,7 +174,7 @@ export function FiscalPeriodEditor() {
 
   return (
     <>
-      <section className="space-y-4 border-t border-border/8 pt-8">
+      <section className="space-y-4 border-t border-border pt-8">
         <div className="space-y-1">
           <h2 className="text-sm font-medium uppercase tracking-wider text-muted-foreground">
             {t('fp_heading')}
@@ -286,7 +286,7 @@ function BlockedState({
       : t('fp_blocked_reason_posted', { count: postedCount })
 
   return (
-    <div className="rounded-lg border border-border/60 bg-muted/30 p-4 space-y-3">
+    <div className="rounded-lg border border-border bg-muted/30 p-4 space-y-3">
       <div className="flex gap-2">
         <Lock className="h-4 w-4 text-muted-foreground flex-shrink-0 mt-0.5" />
         <div className="space-y-1">