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/import/SIEPreviewStep.tsx

@@ -103,7 +103,7 @@ export default function SIEPreviewStep({
               <FileText className="h-4 w-4" />
               <span className="text-sm">Konton</span>
             </div>
-            <p className="text-2xl font-display font-medium tabular-nums">{preview.accountCount}</p>
+            <p className="text-2xl font-display tabular-nums">{preview.accountCount}</p>
           </CardContent>
         </Card>
 
@@ -113,7 +113,7 @@ export default function SIEPreviewStep({
               <BarChart3 className="h-4 w-4" />
               <span className="text-sm">Verifikationer</span>
             </div>
-            <p className="text-2xl font-display font-medium tabular-nums">{preview.voucherCount}</p>
+            <p className="text-2xl font-display tabular-nums">{preview.voucherCount}</p>
           </CardContent>
         </Card>
 
@@ -122,7 +122,7 @@ export default function SIEPreviewStep({
             <div className="flex items-center gap-2 text-muted-foreground mb-1">
               <span className="text-sm">Transaktionsrader</span>
             </div>
-            <p className="text-2xl font-display font-medium tabular-nums">{preview.transactionLineCount}</p>
+            <p className="text-2xl font-display tabular-nums">{preview.transactionLineCount}</p>
           </CardContent>
         </Card>
 
@@ -131,7 +131,7 @@ export default function SIEPreviewStep({
             <div className="flex items-center gap-2 text-muted-foreground mb-1">
               <span className="text-sm">IB Summa</span>
             </div>
-            <p className="text-2xl font-display font-medium tabular-nums">{formatCurrency(preview.openingBalanceTotal)}</p>
+            <p className="text-2xl font-display tabular-nums">{formatCurrency(preview.openingBalanceTotal)}</p>
           </CardContent>
         </Card>
       </div>
@@ -161,7 +161,7 @@ export default function SIEPreviewStep({
             <div>
               <p className="text-sm text-muted-foreground">Status</p>
               {preview.trialBalance.isBalanced ? (
-                <Badge variant="default" className="bg-success">Balanserar</Badge>
+                <Badge variant="success">Balanserar</Badge>
               ) : (
                 <Badge variant="secondary">
                   Diff: {formatCurrency(preview.trialBalance.totalDebit - preview.trialBalance.totalCredit)}