fix: crash on Verify Address in Receive screen

[Copilot]

Tapping "Verify Address" on the Receive screen caused an immediate crash due to a React Rules of Hooks violation in ConnectChannel.

Root cause

useVault was called inside a conditional block, violating React's requirement that hooks always execute unconditionally at the top level:

// Before — hook inside an if block: INVALID
if (mode === InteracationMode.ADDRESS_VERIFICATION) {
  const { activeVault: vault } = useVault({ vaultId }); // 💥 crashes
  ...
}

Fix

• Moved useVault({ vaultId }) to the top level of ConnectChannel, ahead of all conditionals.
• Added && vault null-guard so address-descriptor computation is skipped until the vault is available.
• Added optional chaining on vaultKey?.registeredVaults to harden a latent null-dereference on the same path.

// After — unconditional hook call at top level
const { activeVault: vault } = useVault({ vaultId });

if (mode === InteracationMode.ADDRESS_VERIFICATION && vault) {
  // safe to use vault here
}

[Parsh]

Failure, missing specs