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/dashboard/CompanySwitcher.tsx

@@ -120,7 +120,7 @@ export default function CompanySwitcher() {
     return (
       <Link
         href="/select-company"
-        className="flex items-center gap-2 w-full text-left rounded-lg border border-dashed border-border/60 hover:border-foreground/30 hover:bg-muted/40 -mx-1 px-2 py-1.5 transition-all duration-150"
+        className="flex items-center gap-2 w-full text-left rounded-lg border border-dashed border-border/60 hover:border-foreground/30 hover:bg-muted/40 -mx-1 px-2 py-1.5 transition-colors duration-150"
       >
         <Plus className="h-3.5 w-3.5 text-muted-foreground flex-shrink-0" />
         <span className="text-[13px] text-muted-foreground truncate">{t('add_company')}</span>
@@ -133,7 +133,7 @@ export default function CompanySwitcher() {
       <button
         ref={triggerRef}
         onClick={() => setOpen(!open)}
-        className="flex items-center gap-1.5 w-full text-left rounded-lg border border-transparent hover:border-border/60 hover:bg-muted/40 -mx-1 px-2 py-1.5 transition-all duration-150"
+        className="flex items-center gap-1.5 w-full text-left rounded-lg border border-transparent hover:border-border/60 hover:bg-muted/40 -mx-1 px-2 py-1.5 transition-colors duration-150"
         aria-expanded={open}
         aria-haspopup="listbox"
       >