CLI: actionable validator rejection messages + loading indicators

[LandynDev]

Summary

• Centralizes per-validator broadcast result rendering in allways/cli/validator_rejections.py — a prefix-matched rules table maps every reject_synapse(...) reason from axon_handlers.py to an actionable, user-facing explanation, plus a deterministic-vs-transient classification.
• Wires the translator into the four CLI sites that broadcast to validators: alw swap now (reserve + confirm), alw swap post-tx, alw swap resume-reservation, alw miner activate. Replaces the ad-hoc friendly_rejection helper in miner_commands.py.
• Suppresses the Retry? prompt for deterministic failures (insufficient source balance, invalid proof, wrong direction, swap amount out of range, miner not active, etc.) — retrying with the same inputs can't fix them, so don't ask.
• Adds spinners around the remaining intermittent steps in alw swap now / post-tx / resume: reading miner commitments, eligibility check, protocol bounds query, balance check, validator discovery, broadcast, TAO transfer. Never wraps an interactive signing prompt.

Before

    V1: no Insufficient source balance
No validators accepted the reservation.
Retry? [Y/n]:

After

  V1: no Insufficient source balance

Source address tb1qg6da0krxahqyjhtdmnrrf8qfeqzyfc6ge9kp6j does not hold enough BTC.
Fund it with at least 0.0008 BTC and try again.
Retrying with the same inputs will not change this — fix the underlying issue first.

Test plan

• pytest tests/ — 311 passed (added 11 translator tests)
• ruff format && ruff check — clean
• Trigger insufficient-balance reject in dev environment, confirm new message
• Trigger miner-busy reject (transient), confirm Retry? still appears
• Trigger no-validator-response, confirm new copy
• BTC external-signing flow — confirm no spinner above the paste prompt
• alw miner activate with unregistered hotkey, confirm translator headline replaces the prereqs list