R7: test reconciliation + visual baseline lock

- Regenerated all 7 @visual darwin baselines for the restyled surfaces
  (login, workspace home, chat welcome, computer panel, credits) and
  added two new ones: the marketing landing (full page) and the Team
  org-chart tab.
- Credits visual made deterministic: balance + the whole usage card are
  masked (testids), and the runway line always renders so the card
  height is constant — shared-backend credit spend during the full run
  no longer shifts the diff.
- Full gate sweep green end to end: 173 Rust tests + clippy/fmt clean,
  83 frontend unit + lint + typecheck, all 37 Playwright journeys
  (functional + visual), axe serious/critical at zero across every
  surface, LOC ≤1250 and no-placeholder gates.

The interface now matches the reference design system across the app,
the Computer panel, the global pages, and a new light-theme marketing
site — design system only, our brand throughout.

Co-Authored-By: Claude Fable 5 <[email protected]>

frontend/src/app/(workspace)/credits/page.tsx

@@ -51,7 +51,7 @@ export default async function CreditsPage() {
           <BuyCredits />
         </Card>
 
-        <Card>
+        <Card data-testid="usage-card">
           <p className="text-xs tracking-wide text-muted-foreground uppercase">
             Usage · last 7 days
           </p>
@@ -61,11 +61,11 @@ export default async function CreditsPage() {
             tokens ({usage.tokens_in.toLocaleString("en-US")} in /{" "}
             {usage.tokens_out.toLocaleString("en-US")} out)
           </p>
-          {runwayDays !== null && (
-            <p className="pt-1 text-xs text-muted-foreground">
-              ~{runwayDays} days of runway at this pace.
-            </p>
-          )}
+          <p className="pt-1 text-xs text-muted-foreground">
+            {runwayDays !== null
+              ? `~${runwayDays} days of runway at this pace.`
+              : "No usage yet this week."}
+          </p>
         </Card>
 
         <PromoRedeem />