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>

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

components/settings/SecuritySettings.tsx

@@ -272,11 +272,11 @@ export function SecuritySettings() {
               </div>
             ) : hasMfa ? (
               <div className="space-y-4">
-                <div className="flex items-center gap-3 p-4 rounded-lg border bg-green-50 dark:bg-green-950/20 border-green-200 dark:border-green-900">
-                  <ShieldCheck className="h-5 w-5 text-green-600 dark:text-green-500" />
+                <div className="flex items-center gap-3 p-4 rounded-lg border border-border bg-secondary">
+                  <ShieldCheck className="h-5 w-5 text-success" />
                   <div>
-                    <p className="font-medium text-green-900 dark:text-green-100">{t('mfa_active_title')}</p>
-                    <p className="text-sm text-green-700 dark:text-green-400">
+                    <p className="font-medium text-foreground">{t('mfa_active_title')}</p>
+                    <p className="text-sm text-muted-foreground">
                       {t('mfa_active_description')}
                     </p>
                   </div>