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/MatchAllocationDialog.tsx

@@ -458,7 +458,7 @@ export default function MatchAllocationDialog({
                                 ≈ {formatCurrency(parseAmount(draft.amount) / c.exchangeRate, c.currency)}
                               </p>
                             ) : (
-                              <p className="text-[11px] tabular-nums text-warning-foreground">
+                              <p className="text-[11px] tabular-nums text-attn">
                                 {t('fx_rate_missing_warning', { currency: c.currency })}
                               </p>
                             )
@@ -516,7 +516,7 @@ export default function MatchAllocationDialog({
               // must equal the bank's actual receipt or reconciliation
               // breaks. The user must allocate the full amount or remove
               // selections. PR #607 round-1 review fix.
-              <div className="flex items-start gap-2 rounded-lg bg-warning/10 p-3 text-sm text-warning-foreground">
+              <div className="flex items-start gap-2 rounded-lg bg-muted/30 p-3 text-sm text-attn">
                 <AlertTriangle className="h-4 w-4 flex-shrink-0 mt-0.5" />
                 <p>
                   {t('undershoot_warning', {