refactor(tokenselector): 13 - add support for disabled chain IDs in token selection logic

[fairlighteth]

Summary

• BUY selector now shows all app-supported chains but disables targets that aren’t bridgeable from the current source; the source remains enabled for same-chain swaps. Route availability is pre-checked and merged into the
  disabled set.
• SELL selector unchanged: still driven by the wallet/app-supported list.
• Desktop and mobile chain selectors surface disabled and loading states (blocked clicks, shimmer on loading, tooltip/title for unsupported targets).
• Destination filtering remains scoped to app-supported chains; defaultChainId stays coherent when the selected target is invalid.
• Disabled tooltip string is localized (es-ES, ru-RU).

Clarification

• BUY (output): full app-supported list, with disabled targets when not bridgeable from the current source (bridge destinations + route checks); source chain is injected if absent.
• SELL (input): wallet/app-supported list, independent of bridge data.

Mobile chain sliding selector tooltip on tap of a non-supported chain

To Test

1. BUY selector on a bridge-supported source (e.g., Ethereum):

   • All app-supported chains render; bridgeable targets are enabled.
   • Non-bridgeable targets are disabled only if the source/destination isn’t supported or route check fails.
   • Selection works for enabled targets.

2. BUY selector on a non-bridgeable source (e.g., Sepolia):

   • List shows all chains; non-source chains disabled, source enabled.
   • Disabled chains show the tooltip “This destination is not supported for this source chain.”
   • Disabled clicks do nothing; source selection persists.

3. Same-chain swap:

   • Source chain is present/enabled; defaultChainId falls back sensibly if the stored target is invalid.

4. SELL selector:

   • Behavior unchanged; wallet/app-supported chains only.

5. i18n:

   • Disabled tooltip appears in es-ES and ru-RU translations.

Background

Expose all chains for BUY while preventing selection when no bridge route is available from the current source (via bridge targets + route pre-check), and reflect that state in the UI across desktop/mobile.

[vercel]

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Project	Deployment	Review	Updated (UTC)
cowfi	Ready	Preview	Dec 15, 2025 10:36am
explorer-dev	Ready	Preview	Dec 15, 2025 10:36am
swap-dev	Ready	Preview	Dec 15, 2025 10:36am
widget-configurator	Ready	Preview	Dec 15, 2025 10:36am

2 Skipped Deployments

Project	Deployment	Review	Updated (UTC)
cosmos	Ignored		Dec 15, 2025 10:36am
sdk-tools	Ignored	Preview	Dec 15, 2025 10:36am

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/token-selector-13

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[elena-zh]

"Сеть назначения не доступна для выбранной исходной сети"

[elena-zh]

Hey @fairlighteth , works as described, thanks.
However, then I don't get why don't we show the list of all chains in the Buy token selector. Not available should be disabled there.
All chains from Sell token field:

All chains in the Buy token field.

I do understand that the list is returned by sdk, however, if we implement this logic, it would be nice to have the same list of networks everywhere.

Anyways, it should be another task.

[fairlighteth]

@elena-zh thank you for reviewing. I've refactored this now. We now show the full app-supported chain list in the BUY selector. But we now pre-check routes, and disable non-bridgeable targets (with proper tooltips/loading shimmer states) so BUY matches SELL’s list while blocking unreachable chains.

Previously you'd click on a BUY chain and it would show that no routes exist. Now when you open the BUY token selector it pre-checks are routes and disables the chains:

Screen.Recording.2025-12-09.at.16.51.53.mov

[elena-zh]

Wow, @fairlighteth , thank you!!