[2026-07-resubmission] Add guest browsing flow with App Attest session for App Review resubmission

Adds a pre-login public store locator (guest session via DeviceCheck/App
Attest, keychain-backed token storage) so the app no longer forces sign-in
before showing any content, plus updated support URL metadata.

Sources/PediFoods/Views/Main/HomeViewComponents.swift

@@ -44,6 +44,8 @@ struct SearchBar: View {
                 .foregroundStyle(AppColors.textMuted)
             TextField(placeholder, text: $text)
                 .appNoAutoCap()
+                .foregroundStyle(AppColors.textPrimary)
+                .tint(AppColors.textPrimary)
             Spacer()
             Button(action: onFilterTap) {
                 Image(systemName: "slider.horizontal.3")