fix(C-S/a11y): bump sub-AA stone-500 caption text to stone-400 on dark (night design sweep) (#599)

Design/a11y sweep: 5 small caption/hint texts used text-stone-500 on dark stone bg
(~3.2:1, sub-WCAG-AA which needs 4.5:1 for normal text). Bumped to stone-400 (AA-clean
on stone-900, canon-valid neutral). Surfaces: the First-Light momentum strip hints + unlit
rung, the onboarding website-URL helper copy, the client-import field hint.

No behavior change; raises the design/a11y ceiling. Builds-ahead — deploys with the Deck.
tsc: 0 errors.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Victor-David-Medina

app/(shell)/clients/import/ImportClient.tsx

@@ -344,7 +344,7 @@ function MapAndPreviewCard({
                   </option>
                 ))}
               </select>
-              {hint && <span className="mt-1 block text-[11px] text-stone-500">{hint}</span>}
+              {hint && <span className="mt-1 block text-[11px] text-stone-400">{hint}</span>}
             </label>
           );
         })}

app/(shell)/onboarding/StarterOnboardingWizard.tsx

@@ -495,7 +495,7 @@ export function StarterOnboardingWizard({
                 <div className="space-y-2">
                   <label htmlFor="company-url" className="block text-sm font-medium text-stone-300">
                     Your website{" "}
-                    <span className="font-normal text-stone-500">(optional, we draft your first brief from it)</span>
+                    <span className="font-normal text-stone-400">(optional, we draft your first brief from it)</span>
                   </label>
                   <input
                     id="company-url"
@@ -507,7 +507,7 @@ export function StarterOnboardingWizard({
                     placeholder="yourbusiness.com"
                     className="w-full rounded-lg border border-stone-700 bg-stone-950/70 px-3.5 py-2.5 text-sm text-stone-100 placeholder:text-stone-500 focus-visible:border-amber-400/70 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-amber-400/30"
                   />
-                  <p className="text-xs text-stone-500">
+                  <p className="text-xs text-stone-400">
                     We only read your public website to draft a first brief, nothing is sent to your clients.
                   </p>
                 </div>

components/focus/FirstLightMomentumStrip.tsx

@@ -66,7 +66,7 @@ export function FirstLightMomentumStrip({ readiness }: { readiness: FirstLightRe
                 className={`flex h-5 w-5 flex-none items-center justify-center rounded-full text-[10px] font-bold ${
                   rung.lit
                     ? "bg-amber-500 text-stone-950"
-                    : "border border-stone-700 bg-stone-800 text-stone-500"
+                    : "border border-stone-700 bg-stone-800 text-stone-400"
                 }`}
               >
                 {rung.lit ? <Check className="h-3 w-3" /> : i + 1}
@@ -80,7 +80,7 @@ export function FirstLightMomentumStrip({ readiness }: { readiness: FirstLightRe
               <p className={`text-[11px] font-semibold ${rung.lit ? "text-stone-100" : "text-stone-400"}`}>
                 {rung.label}
               </p>
-              <p className="text-[10px] text-stone-500">{rung.hint}</p>
+              <p className="text-[10px] text-stone-400">{rung.hint}</p>
             </div>
           </li>
         ))}