refactor(design): no amber boxes, attention is one ochre sentence (#1562)

The founder wants the yellow boxes gone everywhere. The design system
already agreed: status colors are data, not chrome (convention 12) and
attention is a single ochre sentence, never a banner (convention 6).
This enforces it:

- ConfirmationDialog: the amber warning panel is now an AttnLine, and
  the hardcoded Swedish default warningText is gone: it injected an
  immutability warning into dialogs whose authors never asked for one
  (every current caller passes the prop explicitly, so no behavior
  change at any call site).
- Badge warning variant: amber fill replaced with a hairline chip and
  ochre text.
- DestructiveConfirmDialog warning variant: neutral icon disc, default
  primary confirm button (only --destructive survives as chrome).
- BankSyncStatusChip stale state: same neutral shape as the healthy
  chip, ochre text carries the signal.
- SandboxBanner: solid amber bar becomes secondary-on-border chrome.
- BankIdAuth, BankIdCompanyPicker, SessionTimeoutModal: the last three
  raw-amber (bg-amber-*) holdouts moved onto tokens, the company-picker
  banner becoming a plain AttnLine.
- Mechanical sweep of the ~58 hand-rolled bg-warning/border-warning
  boxes across 45 files: fills to bg-muted/30 (icon discs bg-muted),
  borders to border-border, text-warning-foreground to text-attn. The
  account-class dots in account-number.tsx keep bg-warning: they are
  data indicators, not chrome.

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

components/transactions/QuickReviewDialog.tsx

@@ -443,8 +443,8 @@ export default function QuickReviewDialog({
 
         {/* Template special rules */}
         {template?.special_rules_sv && (
-          <div className="rounded-lg border border-warning/30 bg-warning/[0.03] px-3 py-2">
-            <p className="text-xs text-warning-foreground leading-snug">
+          <div className="rounded-lg border border-border bg-muted/30 px-3 py-2">
+            <p className="text-xs text-attn leading-snug">
               {template.special_rules_sv}
             </p>
           </div>
@@ -461,10 +461,10 @@ export default function QuickReviewDialog({
 
         {/* Reverse charge warning */}
         {template?.requires_vat_registration_data && (
-          <div className="rounded-lg border border-warning/30 bg-warning/[0.03] px-3 py-2">
+          <div className="rounded-lg border border-border bg-muted/30 px-3 py-2">
             <div className="flex items-start gap-2">
-              <AlertTriangle className="h-3.5 w-3.5 text-warning-foreground flex-shrink-0 mt-0.5" />
-              <p className="text-xs text-warning-foreground leading-snug">
+              <AlertTriangle className="h-3.5 w-3.5 text-attn flex-shrink-0 mt-0.5" />
+              <p className="text-xs text-attn leading-snug">
                 {t('reverse_charge_warning')}
               </p>
             </div>