network monitor hardening

[SantiagoPittella]

Summary

Why:

• Hardens the network monitor based on issues observed while running it against devnet v0.15.0. including: fixes panics on unexpected peer responses, initialize the dashboard immediately, fixes the prover probes that silently died, and prevents the checker stalls during faucet PoW solving, and a UI overflow in the service cards.

How:

• Malformed remote responses no longer panic the checker tasks.
• The dashboard is served immediately at startup. NTX account deployment moved to a supervised background task that retries forever with exponential backoff, publishing "deploying monitor accounts" / unhealthy statuses on the cards until it succeeds.
• The proof-test payload is fetched from the RPC with retries instead of being required at startup
• Faucet PoW challenges are solved on a blocking thread (with a wall-clock timeout) instead of on the async runtime.
• CSS fixes: values with a copy button (.metric-value) now wrap inside the card (min-width: 0, overflow-wrap: anywhere), so long URLs without natural break points no longer push the copy button outside the card box.

Changelog

[[entry]]
scope       = "network-monitor"
impact      = "fixed"
description = "The monitor no longer panics on malformed or version-skewed peer responses; the block-producer mempool object in the /status JSON is now nullable."

[[entry]]
scope       = "network-monitor"
impact      = "fixed"
description = "The dashboard is served immediately at startup; NTX account deployment retries in the background instead of delaying or aborting the monitor."

[[entry]]
scope       = "network-monitor"
impact      = "fixed"
description = "Remote-prover proof-test probes are respawned if they die, retry payload acquisition, and report stale results."

[[entry]]
scope       = "network-monitor"
impact      = "fixed"
description = "Faucet PoW challenges are solved off the async runtime so other checkers are not stalled."

[[entry]]
scope       = "network-monitor"
impact      = "fixed"
description = "Long URLs without wrap points no longer overflow dashboard cards and push the copy button outside the box."

[Mirko-von-Leipzig]

Only a light review, but thank you!