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>

messages/en.json

@@ -604,6 +604,7 @@
     "weak_title": "Password too weak",
     "weak_description": "Password must be at least 8 characters and include uppercase, lowercase, digits, and a special character.",
     "mismatch_title": "Passwords don't match",
+    "mismatch_description": "Make sure you entered the same password in both fields.",
     "save_failed_title": "Could not save password",
     "save_failed_description": "Please try again."
   },
@@ -739,6 +740,7 @@
     "default_payment_terms_label": "Payment terms (days)",
     "default_account_label": "Default account",
     "default_account_placeholder": "e.g. 5410",
+    "default_currency_label": "Default currency",
     "notes_label": "Notes",
     "notes_placeholder": "Internal notes about the supplier...",
     "submit_save": "Save supplier",

messages/sv.json

@@ -604,6 +604,7 @@
     "weak_title": "Lösenordet är för svagt",
     "weak_description": "Lösenordet måste vara minst 8 tecken och innehålla versaler, gemener, siffror och specialtecken.",
     "mismatch_title": "Lösenorden matchar inte",
+    "mismatch_description": "Kontrollera att du skrev samma lösenord i båda fälten.",
     "save_failed_title": "Kunde inte spara lösenordet",
     "save_failed_description": "Försök igen."
   },
@@ -739,6 +740,7 @@
     "default_payment_terms_label": "Betalningsvillkor (dagar)",
     "default_account_label": "Standardkonto",
     "default_account_placeholder": "T.ex. 5410",
+    "default_currency_label": "Standardvaluta",
     "notes_label": "Anteckningar",
     "notes_placeholder": "Interna anteckningar om leverantören...",
     "submit_save": "Spara leverantör",