fix(card): make card_network optional in CardElement rendering

[Pradeep-kumar1202]

Type of Change

• Bugfix
• Feature
• Refactor
• Chore
• CI/CD
• Docs

---

Summary

• Replace positional Array.get(0..4) in CardElement.res with name-based lookup via the new SuperpositionHelper.findFieldByName.
• Make card.card_network optional — only the four essentials (number, exp month, exp year, cvc) gate the render.
• Move the BIN-detected card brand from a useField slot to local React.useState. Card brand is a derived value, not user input, so it doesn't belong in form state by default.
• Add an inner CardNetworkSync render-null component that registers card_network with React Final Form and mirrors the local brand into form state — mounted only when superposition required the field.
• Drop the cardNetworkMeta branch from the error-display switch; brand is BIN-derived and never user-typed.

Why

Superposition drives the dynamic field set per connector. For ~119 of 120 connectors, card_network is not in the required fields. The old positional pattern match expected exactly five Some(_) values, so the entire card form fell through to
React.null and merchants saw a blank screen.

Name-based lookup is order- and count-independent, so adding/removing optional fields no longer breaks the form. Lifting brand to local state cleanly separates client-side concerns (CVC sizing, formatting, co-badged dropdown) from the
submission contract.

Files changed

• src/components/dynamic/CardElement.res — name-based lookup, optional card_network, local brand state, CardNetworkSync inner module.
• Submodule bump for shared-code to pick up findFieldByName.

---

Screenshots / Recordings

---

Affected Area & Impact

• Client Core
• Shared Codebase
• Android
• iOS

Android PR / status (if any):
iOS PR / status (if any):
Shared Codebase PR / status (if any): juspay/hyperswitch-sdk-utils#54

Testing

• JS bundle built
• Tested in Android app
• Tested in iOS app

Notes:

---

• The shared-code PR needs to merge first

Checklist

• Tested in consuming Android app
• Tested in consuming iOS app

[kanikabansal08]

@hyperswitch-client-core-review-bot please review this PR.

[hs-agent]

Verdict: ✅ Approve

🚫 0 critical · ⚠️ 0 warning · 💡 1 suggestion · 🔍 0 nitpick

Fixes the blank card form bug for connectors without card_network. The name-based lookup is a solid structural improvement over positional indexing.

[Pradeep-kumar1202]

The intended changes went in this PR #524