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/auth/BankIdAuth.tsx

@@ -441,7 +441,7 @@ export function BankIdAuth({ mode, onComplete }: BankIdAuthProps) {
             className="gap-1.5 text-muted-foreground"
           >
             <Monitor className="h-3.5 w-3.5" />
-            BankID pa den har enheten
+            BankID på den här enheten
           </Button>
         </>
       )}
@@ -449,7 +449,7 @@ export function BankIdAuth({ mode, onComplete }: BankIdAuthProps) {
       {isMobile() && (
         <div className="flex flex-col items-center gap-2">
           <Smartphone className="h-8 w-8 text-muted-foreground" />
-          <p className="text-sm text-muted-foreground">Oppnar BankID-appen...</p>
+          <p className="text-sm text-muted-foreground">Öppnar BankID-appen...</p>
         </div>
       )}