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/onboarding/Step2SectorSelection.tsx

@@ -22,7 +22,7 @@ export default function Step2SectorSelection({ onNext, onBack, isSaving }: Step2
   return (
     <div className="space-y-6">
       <div>
-        <h2 className="text-lg font-semibold">Vilken bransch verkar du inom?</h2>
+        <h2 className="text-lg">Vilken bransch verkar du inom?</h2>
         <p className="text-sm text-muted-foreground mt-1">
           Vi anpassar verktyg och tillägg baserat på din bransch. Du kan alltid ändra detta senare.
         </p>
@@ -36,7 +36,7 @@ export default function Step2SectorSelection({ onNext, onBack, isSaving }: Step2
             <Card
               key={sector.slug}
               className={cn(
-                'cursor-pointer transition-all',
+                'cursor-pointer transition-colors',
                 isSelected
                   ? 'border-primary ring-2 ring-primary/20'
                   : 'hover:border-primary/50'