feat: migrate cosmostation to the hub

[arlert-armin]

Summary

This PR adds Cosmos (Cosmostation) support to the Hub and integrates its connection and account model into the Hub’s Cosmos namespace architecture.
While core functionality works, Cosmostation introduces several important limitations account switching, and auto-connect behavior. These limitations originate from Cosmostation itself and not the Hub integration.

Implementation notes / limitations

Feature

⚠️ Switch Account

Cosmostation does not provide a working account-switch notification mechanism for Cosmos.
When a user switches accounts inside the wallet:

• The dApp is not notified.
• The Hub continues using the old account, since no event or update is emitted.

A reconnect is required to update the account state.

⚠️ Auto Connect (Cosmos)

Cosmos eager-connect behavior is tied to EVM connectivity:

• Eager-connect for Cosmos only works if EVM is already connected.

• If EVM is not connected, Cosmos eager-connect will not trigger.

• As a result:

  • Auto-connect fails for Cosmos unless EVM is connected.

Fixes # (issue)

How did you test this change?

I validated Cosmostation under the Hub integration across multiple scenarios:

• Confirmed initial Cosmos connection works.

• Verified account retrieval and standard Cosmos operations.

• Tested auto-connect:

  • Confirmed eager-connect works only when EVM is connected first.
  • Verified it fails when EVM is not connected (expected limitation).

• Ensured that reconnecting restores the correct account state.

• Test A

• Test B

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Implemented a user interface (UI) change, referencing our Figma design to ensure pixel-perfect precision.