Add a reconnecting state to the wallet connection flow retrying automatically if the wallet extension is slow to respond

[Chucks1093]

Summary

When the wallet extension takes longer than expected to respond to a connection request, the UI freezes on the connect button with no feedback. A reconnecting state with a spinner and 'Waiting for wallet…' label would reassure the user and retry automatically after a timeout.

Scope

• Show a spinner and 'Waiting for wallet…' label on the connect button after 3 seconds with no response
• Retry the connection request automatically after 15 seconds if the wallet has not responded
• After 3 retries, show 'Could not connect — please try again' and reset the button
• Cancel the retry loop if the user clicks the connect button again
• Unit test: spinner appears after 3 seconds, retry fires after 15 seconds

Acceptance Criteria

• Spinner and label appear after 3 seconds with no response
• Automatic retry after 15 seconds
• After 3 retries the error state is shown and the button reset
• User click cancels the retry loop
• Unit tests for timeout and retry behaviour pass

ETA: 12 hours

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Coordinate on Telegram

[Agbasimere]

Hello, I'd like to work on this issue.