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/dashboard/SandboxBanner.tsx

@@ -17,20 +17,22 @@ export function SandboxBanner() {
     router.push('/register')
   }
 
+  // Primary-on-secondary, not a solid amber bar: the sandbox notice is
+  // environment chrome, and chrome never wears the warning fill.
   return (
-    <div className="relative z-50 flex items-center justify-center gap-x-3 gap-y-1 bg-warning px-10 py-2 text-sm text-warning-foreground sm:px-4 flex-wrap">
+    <div className="relative z-50 flex items-center justify-center gap-x-3 gap-y-1 border-b border-border bg-secondary px-10 py-2 text-sm text-secondary-foreground sm:px-4 flex-wrap">
       <span className="font-medium text-center text-xs sm:text-sm">
         Sandlådemiljö: AI och externa tjänster är avstängda. Data raderas efter 24h.
       </span>
       <button
         onClick={handleCreateAccount}
-        className="shrink-0 rounded-md bg-warning-foreground/15 px-3 py-0.5 text-xs font-semibold hover:bg-warning-foreground/25 transition-colors"
+        className="shrink-0 rounded-md bg-foreground/10 px-3 py-0.5 text-xs font-semibold hover:bg-foreground/15 transition-colors"
       >
         Skapa konto
       </button>
       <button
         onClick={() => setDismissed(true)}
-        className="absolute right-2 top-1/2 -translate-y-1/2 rounded p-1 hover:bg-warning-foreground/15 transition-colors"
+        className="absolute right-2 top-1/2 -translate-y-1/2 rounded p-1 hover:bg-foreground/10 transition-colors"
         aria-label="Stäng"
       >
         <X className="h-3.5 w-3.5" />