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/extensions/shared/MockDataBanner.tsx

@@ -19,15 +19,15 @@ export default function MockDataBanner({ importedAt, onClear, onReplace }: MockD
     : null
 
   return (
-    <Card className="border-l-4 border-l-warning bg-warning/[0.03]">
+    <Card className="border-l-4 border-l-warning bg-muted/30">
       <CardContent className="pt-4 pb-4">
         <div className="flex items-center gap-3">
-          <FlaskConical className="h-5 w-5 text-warning-foreground shrink-0" />
+          <FlaskConical className="h-5 w-5 text-attn shrink-0" />
           <div className="flex-1 min-w-0">
-            <p className="text-sm font-medium text-warning-foreground">
+            <p className="text-sm font-medium text-attn">
               Testdata aktivt
             </p>
-            <p className="text-xs text-warning-foreground mt-0.5">
+            <p className="text-xs text-attn mt-0.5">
               Rapporten visar importerad testdata istället för bokföringsdata.
               {formatted && <> Importerat {formatted}.</>}
             </p>