fix(09-01): resolve DEBT-01 aria-label inconsistency in FieldRenderer and PasswordField

- Add FieldRenderer.test.tsx: 4 tests verifying both branches use aria-label consistently
- Fix FieldRenderer.tsx text-branch: replace sr-only span with aria-label={} matching select-branch
- Fix PasswordField.tsx tooltip button: same sr-only -> aria-label fix
- Update RemoteConfigStep.test.tsx: add { selector: 'input' } to getByLabelText queries that
  now conflict with tooltip button aria-labels (regression fix)

src/components/ui/PasswordField.tsx

@@ -24,10 +24,10 @@ export function PasswordField({ id, label, error, registration, placeholder, hel
           <button
             type="button"
             onClick={() => setShowTooltip(v => !v)}
+            aria-label={`More info about ${label}`}
             className="text-primary hover:text-primary text-xs leading-none"
           >
-            <span className="sr-only">More info about {label}</span>
-            <span aria-hidden="true">ⓘ</span>
+            ⓘ
           </button>
         )}
       </div>