Improve wallet show. (#4642)

[afck]

Backport of #4642.

Motivation

It's hard to tell from wallet show which chain is the admin chain. The table layout uses a lot of horizontal space.

Proposal

Improve the wallet show output:

WALLET (4 chains in total)

Child Chain [DEFAULT]
  Chain ID:     a08244c18c828b7b89289f7164428e0b861fb462042416f6c2cfb1f4b53c8621
  Owner:        0x86843df3f162b0a820724d37612ecde13c9a022d0cc96b765be127d34cec2d19
  Timestamp:    2025-09-24 12:54:53.051239
  Blocks:       0

Admin Chain
  Chain ID:     82fc0ff002b793c66db0c57e657c05a30a98cd49d335f8125d0c3bdc4997ffa1
  Owner:        No owner key
  Timestamp:    2025-09-24 12:53:29.841442
  Blocks:       0

Root Chain 1
  Chain ID:     0b67f224ab915776d170eeb7d497e8d1ed831126f22eaf9138de48e3c47c8639
  Owner:        No owner key
  Timestamp:    2025-09-24 12:55:04.030389
  Blocks:       2
  Latest Block: f67e7ee881b6f9235f1a4cc6f2515d9ce4afccb1bd799f8780987901a581ac03

Child Chain
  Chain ID:     87c4ef0bfc8d6581529dc32c98d05ba99be9e9202f8f788f9c0c2a872c02fdf6
  Owner:        0x9010b58faf7b4908de3069aa7aa042ba4f2eb0de13724059960aaa5be33aa6a6
  Timestamp:    2025-09-24 12:55:04.030389
  Blocks:       0

Test Plan

• Discuss the new layout!
• CI
• I ran the README tests locally.

Release Plan

• These changes could be backported to testnet_conway, and
• released in a new SDK.

Links

• PR on main: Improve wallet show. #4642
• Original attempt: Track admin chain; improve wallet show. #4541
• reviewer checklist

[MathieuDutSik]

Thanks for the better first line.
But I do not like that some information were removed.
Maybe allow users to add some additional arguments to linera wallet show?

[afck]

Yes, I'd like a --verbose option in the future.

But: What information was removed?
(Compared to the main branch, I only removed the epoch, because on testnet_conway that isn't in the wallet.)

[ma2bd]

I'm not super fond of making "Child chain" an official concept, even for developers.

[ma2bd]

Let's finish iterating on this on main first.

[MathieuDutSik]

But: What information was removed? (Compared to the main branch, I only removed the epoch, because on testnet_conway that isn't in the wallet.)

Ok, I see the reason why epoch is removed from the printing. So, approved from my side.

[MathieuDutSik]

I understand that epoch cannot be shown on the TestNet Conway, which is why it was removed.

There is merit to having enhanced functionality on the TestNet and therefore I approve the PR.